Dr Andrew Fleming

Dr Andrew Fleming

Associate Professor

School of Electrical Engineering and Computing (Electrical and Computer Engineering)

Building a future from the atoms up

Australian Research Fellow Associate Professor Andrew Fleming has co-authored a significant new book that is of particular interest to researchers in mechatronics and in control applied to atomic force microscopy and other nanopositioning applications.

Andrew Fleming

Design, Modeling and Control of Nanopositioning Systems, co-authored with Associate Professor Kam K Leang from the University of Nevada, is the first comprehensive text on the complete design cycle of nanopositioning systems.

Published in 2014, the book covers three broad areas covering precision control theory; the complete process of nanopositioning control including practical difficulties and their solution; and applying basic principles to experimental application in atomic force microscopes.

Fleming's previous publications include over 130 papers for journals and conferences and three books. He also has six patent applications with international licensing in 13 countries.

A graduate of the University with a Bachelor of Electrical Engineering in 2000 and a PhD in 2004, Fleming is currently a Associate Professor with the School of Electrical Engineering and Computer Science and Director of the University's Precision Mechatronics Lab. The Lab enables a multidisciplinary group of electrical engineers, mechanical engineers and physicists to combine their knowledge to develop new mechatronic and robotic technologies for fabrication, imaging and health care. Fleming's research focuses on nanofabrication, micro-robotics, metrological sensing, nano-positioning and high-speed scanning probe microscopy.

Over the past 12 years, Fleming has secured over $10 million in funding, including a  $750,000 Australian Research Council Future Fellowship for full-time research from 2014 to 2017 into miniaturising piezoelectric sensors. Amongst the many awards received in his stellar career, Fleming received the Newcastle Innovation Rising Star Award for Excellence in Industrial Engagement and Technology Transfer in 2012 and was named the University of Newcastle's Researcher of the Year in 2007.

"There is an ever increasing demand for higher performance and miniaturisation in mechatronic systems such as semiconductor process machinery, atomic force microscopy, and biomedical devices", explains Fleming. "This demand is driving the development of new high-performance methods for sensing and actuation, precision fabrication, and control.

"Research at the Precision Mechatronics Lab is at the forefront of these developments with a number of new technologies for building and controlling new miniature piezoelectric systems. These technologies are being applied to applications such as integrated circuit fabrication, ultrasonic machining, miniature robotics, and high performance motion control."

Fleming was also successful in receiving a $266,300 Australian Research Council 2015 Discovery Project grant for his research into atomic resolution sensors for imaging and metrological science.

Dr Andrew Fleming

Building a future from the atoms up

Associate Professor Andrew Fleming's research includes optical nanofabrication, nanopositioning control systems, high-speed scanning probe microscopy,

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Career Summary

Biography

Andrew J. Fleming graduated from The University of Newcastle, Australia with a Bachelor of Electrical Engineering in 2000 and Ph.D in 2004. Dr. Fleming is now an Australian Research Council Future Fellow and Director of the Precision Mechatronics Lab at The University of Newcastle, Australia. His research includes nanofabrication, micro-robotics, metrological sensing, nano-positioning, and high-speed scanning probe microscopy. Dr. Fleming’s research awards include the IEEE Transactions on Control Systems Technology Outstanding Paper Award, The University of Newcastle Researcher of the Year Award, and the Faculty of Engineering and Built Environment Award for Research Excellence. He is the co-author of three books and more than 170 Journal and Conference papers. Dr. Fleming is the inventor of several patent applications and in 2012 he received the Newcastle Innovation Rising Star Award for Excellence in Industrial Engagement.

Research Impact

Awards/Fellowships

  • Best Paper Award Finalist, IEEE Advanced Intelligent Mechatronics 2016
  • ARC Future Fellowship 2014-2017
  • Newcastle Innovation Rising Star Award, 2012
  • ARC Australian Research Fellowship 2009-2013
  • The University of Newcastle Vice Chancellors Award for Researcher of the Year, 2007
  • Best Paper Award - IEEE Transactions on Control Systems Technology, 2007
  • Faculty of Engineering and Built Environment Award for Research Excellence, 2007
  • ARC Australian Post-Doctoral Fellowship 2006-2008

Funding    

Supervised Student Awards

  • Yik Ren Teo – Best Student Paper Finalist, IEEE MSC 2015
  • Shannon Rios – Best Student Paper Finalist, IEEE AIM, 2015
  • Mathew Fairbain – Best Student Paper Award, Australian Control Conference

Professional Activities

  • Chief Specialty Editor for Mechatronics, Frontiers in Mechanical Engineering (Nature Publishing Group)
  • IEEE Nanotechnology Council – Control Systems Society Representative
  • International Program Committee Member for the following conferences:
  • American Control Conference, Chicago, IL, 2015
  • American Control Conference, Portland, OR, 2014
  • American Control Conference, Vancouver, 2013
  • 3rd IFAC Symposium on Mechatronic Systems, Sydney, 2004
  • Associate editor: Advances in Vibration and Acoustics (2007-2011)
  • Grant reviewer for the Australian Research Council
  • University of Newcastle Research Development Advisory Group (2009-2010)



Qualifications

  • PhD, University of Newcastle
  • Bachelor of Engineering (Honours), University of Newcastle

Keywords

  • Atomic Force Microscopy
  • Control Systems
  • Digital Signal Processing
  • Micro-cantilever sensors
  • Nanometer Position Sensors
  • Nanopositioning
  • Optical Microfabrication
  • Probe Based Nanofabrication
  • Scanning Probe Microscopy

Awards

Research Award

Year Award
2012 Rising Star Award
Newcastle Innovation
2011 Best Student Paper Award - Awarded to Mr. Matt Fairbain
Australian Control Conference
2007 Best Paper Award
IEEE Transactions on Control Systems Technology
2007 Researcher of the Year
University of Newcastle
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Publications

For publications that are currently unpublished or in-press, details are shown in italics.


Book (3 outputs)

Year Citation Altmetrics Link
2014 Fleming AJ, Leang KK, Design, Modeling and Control of Nanopositioning Systems, Springer, Cham, Switzerland, 411 (2014) [A1]
DOI 10.1007/978-3-319-06617-2_1
2006 Moheimani SO, Fleming AJ, Piezoelectric Transducers for Vibration Control and Damping, Springer, Berlin, 271 (2006) [A1]
Co-authors Reza Moheimani
2003 Moheimani SO, Halim D, Fleming AJ, Spatial Control of Vibration - Theory and Experiments, World Scientific Publishing Co. Pte. Ltd., Singapore, 223 (2003) [A1]
Co-authors Reza Moheimani

Chapter (2 outputs)

Year Citation Altmetrics Link
2015 Leang KK, Fleming AJ, 'Tracking control for nanopositioning systems', Nanopositioning Technologies: Fundamentals and Applications 213-244 (2015)

© Springer International Publishing Switzerland 2016. The performance of nanopositioning systems is greatly affected by their mechanical dynamics, and for piezo-actuated designs,... [more]

© Springer International Publishing Switzerland 2016. The performance of nanopositioning systems is greatly affected by their mechanical dynamics, and for piezo-actuated designs, induced structural vibration, hysteresis, and creep can drastically limit positioning precision. Therefore, tracking control, both feedback and feedforward control, plays an important role in achieving high-performance operation, especially at high operating frequencies. This chapter reviews popular feedback and feedforward control techniques for nanopositioning systems. First, the effects of vibration, hysteresis, and creep are described, where simple methods traditionally employed to avoid these effects are discussed. Second, various models for nanopositioning systems for control system design, simulation, and synthesis are presented. Finally, popular feedback and feedforward controllers to handle vibration, hysteresis, and creep are presented, along with experimental results.

DOI 10.1007/978-3-319-23853-1_7
Citations Scopus - 1
2015 Fleming AJ, Leang KK, 'Position sensors for nanopositioning', Nanopositioning Technologies: Fundamentals and Applications 245-294 (2015)

© Springer International Publishing Switzerland 2016. Position sensors with nanometer resolution are a key component of many precision imaging and fabrication machines. Since the... [more]

© Springer International Publishing Switzerland 2016. Position sensors with nanometer resolution are a key component of many precision imaging and fabrication machines. Since the sensor characteristics can define the linearity, resolution, and speed of the machine, the sensor performance is a foremost consideration. The first goal of this article is to define concise performance metrics and to provide exact and approximate expressions for error sources including nonlinearity, drift, and noise. The second goal is to review current position sensor technologies and to compare their performance. The sensors considered include: resistive, piezoelectric, and piezoresistive strain sensors; capacitive sensors; electrothermal sensors; eddy-current sensors; linear variable displacement transformers; interferometers; and linear encoders.

DOI 10.1007/978-3-319-23853-1_8

Journal article (79 outputs)

Year Citation Altmetrics Link
2017 Ragazzon MRP, Ruppert MG, Harcombe DM, Fleming AJ, Tommy Gravdahl J, 'Lyapunov Estimator for High-Speed Demodulation in Dynamic Mode Atomic Force Microscopy', IEEE Transactions on Control Systems Technology, (2017)

In dynamic mode atomic force microscopy (AFM), the imaging bandwidth is governed by the slowest component in the open-loop chain consisting of the vertical actuator, cantilever, a... [more]

In dynamic mode atomic force microscopy (AFM), the imaging bandwidth is governed by the slowest component in the open-loop chain consisting of the vertical actuator, cantilever, and demodulator. While the common demodulation method is to use a lock-in amplifier (LIA), its performance is ultimately bounded by the bandwidth of the postmixing low-pass filters. This brief proposes an amplitude and phase estimation method based on a strictly positive real Lyapunov design approach. The estimator is designed to be of low complexity while allowing for high bandwidth. In addition, suitable gains for high performance are suggested such that no tuning is necessary. The Lyapunov estimator is experimentally implemented for amplitude demodulation and shown to surpass the LIA in terms of tracking bandwidth and noise performance. High-speed AFM images are presented to corroborate the results.

DOI 10.1109/TCST.2017.2692721
Co-authors Michael Ruppert
2017 Yong YK, Fleming AJ, 'Note: An improved low-frequency correction technique for piezoelectric force sensors in high-speed nanopositioning systems.', Rev Sci Instrum, 88 046105 (2017)
DOI 10.1063/1.4981530
Co-authors Yuenkuan Yong
2016 Rios SA, Fleming AJ, 'Design of a Charge Drive for Reducing Hysteresis in a Piezoelectric Bimorph Actuator', IEEE/ASME Transactions on Mechatronics, 21 51-54 (2016) [C1]

© 1996-2012 IEEE.This paper describes the design of a charge drive for reducing the hysteresis exhibited by a piezoelectric bimorph bender. Existing charge drive circuits cannot ... [more]

© 1996-2012 IEEE.This paper describes the design of a charge drive for reducing the hysteresis exhibited by a piezoelectric bimorph bender. Existing charge drive circuits cannot be directly applied to bimorph benders since they share a common electrode. In this paper, a new charge drive circuit and electrical configuration are implemented that allows commonly available piezoelectric bimorphs to be linearized. This circuit consists of four major components, including, a high voltage amplifier, a differential amplifier, a piezoelectric load, and a PI feedback controller. An isolation amplifier was used to achieve a differential amplifier with a high common-mode rejection ratio. The charge drive was tested by driving a series poled three layer bimorph bender. The experiment showed a significant improvement to the hysteresis of the bender when compared to a typical voltage drive. This paper has identified an alternative Feedback method to improve the ac hysteresis performance of a piezoelectric bender by using a charge drive.

DOI 10.1109/TMECH.2015.2483739
Citations Scopus - 2Web of Science - 2
2016 Yong YK, Wadikhaye SP, Fleming AJ, 'High speed single- and dual-stage vertical positioners', Review of Scientific Instruments, 87 (2016) [C1]

© 2016 Author(s).This article presents a high-speed single- and dual-stage vertical positioners for applications in optical systems. Each positioner employs a unique end-constrai... [more]

© 2016 Author(s).This article presents a high-speed single- and dual-stage vertical positioners for applications in optical systems. Each positioner employs a unique end-constraint method with orthogonal flexures to preload a piezoelectric stack actuator. This end-constraint method also significantly increases the first mechanical resonance frequency. The single-stage positioner has a displacement range of 7.6 µm and a first resonance frequency of 46.8 kHz. The dual-stage design consists of a long-range slow-stage and a short-range fast-stage. An inertial counterbalance technique was implemented on the fast-stage to cancel inertial forces resulting from high-speed motion. The dual-stage positioner has a combined travel range of approximately 10 µm and a first evident resonance frequency of 130 kHz.

DOI 10.1063/1.4960080
Citations Scopus - 2Web of Science - 2
Co-authors Yuenkuan Yong
2016 Fleming AJ, Wills AG, Routley BS, 'Exposure Optimization in Scanning Laser Lithography', IEEE Potentials, 35 33-39 (2016) [C1]

© 2015 IEEE.In 1959, the integrated circuit (IC) was invented simultaneously by Jack Kilby of Texas Instruments and Robert Noyce of Shockley Semiconductor [Ki lby, 2000]. This de... [more]

© 2015 IEEE.In 1959, the integrated circuit (IC) was invented simultaneously by Jack Kilby of Texas Instruments and Robert Noyce of Shockley Semiconductor [Ki lby, 2000]. This development has been considered one of mankind's most significant innovations.

DOI 10.1109/MPOT.2016.2540039
2016 Eielsen AA, Teo YR, Fleming AJ, 'Improving Robustness Filter Bandwidth in Repetitive Control by Considering Model Mismatch', Asian Journal of Control, (2016)

© 2016 Chinese Automatic Control Society and John Wiley & Sons Australia, Ltd. Repetitive control (RC) is used to track and reject periodic signals by including a model of a pe... [more]

© 2016 Chinese Automatic Control Society and John Wiley & Sons Australia, Ltd. Repetitive control (RC) is used to track and reject periodic signals by including a model of a periodic signal in the feedback path. The performance of RC can be improved by including an inverse plant response filter, but due to modeling uncertainty at high frequencies, a low-pass robustness filter is also required to limit the bandwidth of the signal model and ensure stability. The design of robustness filters is presently ad-hoc, which may result in excessively conservative performance. This article proposes a new automatic method for designing the robustness filter based on convex optimization and an uncertainty model. Experimental results on a nanopositioning system demonstrate that the proposed method outperforms the traditional brick-wall filter approach.

DOI 10.1002/asjc.1437
Co-authors Arnfinnaas Eielsen
2016 Eielsen AA, Fleming AJ, 'Improving Digital-to-Analog Converter Linearity by Large High-Frequency Dithering', IEEE Transactions on Circuits and Systems I: Regular Papers, PP (2016)

© 2016 IEEE.A new method for reducing harmonic distortion due to element mismatch in digital-to-analog converters is described. This is achieved by using a large high-frequency p... [more]

© 2016 IEEE.A new method for reducing harmonic distortion due to element mismatch in digital-to-analog converters is described. This is achieved by using a large high-frequency periodic dither. The reduction in nonlinearity is due to the smoothing effect this dither has on the nonlinearity, which is only dependent on the amplitude distribution function of the dither. Since the high-frequency dither is unwanted in the output of the digital-to-analog converter, the dither is removed by an output filter. The fundamental frequency component of the dither is attenuated by a passive notch filter and the remaining fundamental component and harmonic components are attenuated by the low-pass reconstruction filter. Two methods that further improve performance are also presented. By reproducing the dither on a second channel and subtracting it using a differential amplifier, additional dither attenuation is achieved; and by averaging several channels, the noise-floor of the output is improved. Experimental results demonstrate more than 10 dB improvement in the signal-to-noise-and-distortion ratio.

DOI 10.1109/TCSI.2016.2561778
Co-authors Arnfinnaas Eielsen
2016 Teo YR, Yong Y, Fleming AJ, 'A comparison of scanning methods and the vertical control implications for scanning probe microscopy', Asian Journal of Control, (2016)

© 2016 Chinese Automatic Control Society and John Wiley & Sons Australia, Ltd. This article compares the imaging performance of non-traditional scanning patterns for scanning p... [more]

© 2016 Chinese Automatic Control Society and John Wiley & Sons Australia, Ltd. This article compares the imaging performance of non-traditional scanning patterns for scanning probe microscopy including sinusoidal raster, spiral, and Lissajous patterns. The metrics under consideration include the probe velocity, scanning frequency, and required sampling rate. The probe velocity is investigated in detail as this quantity is proportional to the required bandwidth of the vertical feedback loop and has a major impact on image quality. By considering a sample with an impulsive Fourier transform, the effect of scanning trajectories on imaging quality can be observed and quantified. The non-linear trajectories are found to spread the topography signal bandwidth which has important implications for both low and high-speed imaging. These effects are studied analytically and demonstrated experimentally with a periodic calibration grating.

DOI 10.1002/asjc.1422
Co-authors Yuenkuan Yong
2016 Yong YK, Fleming AJ, 'High-speed vertical positioning stage with integrated dual-sensor arrangement', Sensors and Actuators, A: Physical, 248 184-192 (2016) [C1]

© 2016 Elsevier B.V.This article presents a novel vertical positioning stage with a dual-sensor arrangement suitable for scanning probe microscopy. The stage has a travel range o... [more]

© 2016 Elsevier B.V.This article presents a novel vertical positioning stage with a dual-sensor arrangement suitable for scanning probe microscopy. The stage has a travel range of 8.4¿µm and a first resonance frequency of 24¿kHz in the direction of travel. The sensor arrangement consists of an integrated piezoelectric force sensor and laminated piezoresistive strain sensor. The piezoelectric force sensor exhibits extremely low noise and introduces a zero into the dynamics which allows the use of integral force feedback. This control method provides excellent damping performance and guaranteed stability. The piezoresistive sensor is used for tracking control with an analog PI controller which is shown to be an approximate inverse of the damped system. The resulting closed-loop system has a bandwidth is 11.4¿kHz and 6s-resolution of 3.6¿nm, which is ideal for nanopositioning and atomic force microscopy (AFM) applications. The proposed vertical stage is used to replace the vertical axis of a commercial AFM. Scans are performed in constant-force contact mode with a tip velocity of 0.2¿mm/s, 1¿mm/s and 2¿mm/s. The recorded images contain negligible artefacts due to insufficient vertical bandwidth.

DOI 10.1016/j.sna.2016.06.042
Citations Scopus - 1Web of Science - 1
Co-authors Yuenkuan Yong
2016 Teo YR, Fleming AJ, Eielsen AA, Tommy Gravdahl J, 'A Simplified Method for Discrete-Time Repetitive Control Using Model-Less Finite Impulse Response Filter Inversion', Journal of Dynamic Systems, Measurement and Control, Transactions of the ASME, 138 (2016) [C1]

© 2016 by ASME.Repetitive control (RC) achieves tracking and rejection of periodic exogenous signals by incorporating a model of a periodic signal in the feedback path. To improv... [more]

© 2016 by ASME.Repetitive control (RC) achieves tracking and rejection of periodic exogenous signals by incorporating a model of a periodic signal in the feedback path. To improve the performance, an inverse plant response filter (IPRF) is used. To improve robustness, the periodic signal model is bandwidth-limited. This limitation is largely dependent on the accuracy of the IPRF. A new method is presented for synthesizing the IPRF for discrete-time RC. The method produces filters in a simpler and more consistent manner than existing best-practice methods available in the literature, as the only variable involved is the selection of a windowing function. It is also more efficient in terms of memory and computational complexity than existing methods. Experimental results for a nanopositioning stage show that the proposed method yields the same or better tracking performance compared to existing methods.

DOI 10.1115/1.4033274
Co-authors Arnfinnaas Eielsen
2015 Rios SA, Fleming AJ, 'A new electrical configuration for improving the range of piezoelectric bimorph benders', SENSORS AND ACTUATORS A-PHYSICAL, 224 106-110 (2015) [C1]
DOI 10.1016/j.sna.2015.01.031
Citations Scopus - 5Web of Science - 4
2015 Fleming AJ, Routley BS, 'A closed-loop phase-locked interferometer for wide bandwidth position sensing', Review of Scientific Instruments, 86 (2015) [C1]

© 2015 AIP Publishing LLC.This article describes a position sensitive interferometer with closed-loop control of the reference mirror. A calibrated nanopositioner is used to lock... [more]

© 2015 AIP Publishing LLC.This article describes a position sensitive interferometer with closed-loop control of the reference mirror. A calibrated nanopositioner is used to lock the interferometer phase to the most sensitive point in the interferogram. In this configuration, large low-frequency movements of the sensor mirror can be detected from the control signal applied to the nanopositioner and high-frequency short-range signals can be measured directly from the photodiode. It is demonstrated that these two signals are complementary and can be summed to find the total displacement. The resulting interferometer has a number of desirable characteristics: it is optically simple, does not require polarization or modulation to detect the direction of motion, does not require fringe-counting or interpolation electronics, and has a bandwidth equal to that of the photodiode. Experimental results demonstrate the frequency response analysis of a high-speed positioning stage. The proposed instrument is ideal for measuring the frequency response of nanopositioners, electro-optical components, MEMs devices, ultrasonic devices, and sensors such as surface acoustic wave detectors.

DOI 10.1063/1.4935469
Citations Scopus - 2Web of Science - 1
2015 Russell D, Fleming AJ, Aphale SS, 'Simultaneous Optimization of Damping and Tracking Controller Parameters Via Selective Pole Placement for Enhanced Positioning Bandwidth of Nanopositioners', Journal of Dynamic Systems, Measurement and Control, Transactions of the ASME, 137 (2015) [C1]

© 2015 by ASME.Positive velocity and position feedback (PVPF) is a widely used control scheme in lightly damped resonant systems with collocated sensor actuator pairs. The popula... [more]

© 2015 by ASME.Positive velocity and position feedback (PVPF) is a widely used control scheme in lightly damped resonant systems with collocated sensor actuator pairs. The popularity of PVPF is due to the ability to achieve a chosen damping ratio by repositioning the poles of the system. The addition of a tracking controller, to reduce the effects of inherent nonlinearities, causes the poles to deviate from the intended location and can be a detriment to the damping achieved. By designing the PVPF and tracking controllers simultaneously, the optimal damping and tracking can be achieved. Simulations show full damping of the first resonance mode and significantly higher bandwidth than that achieved using the traditional PVPF design method, allowing for high-speed scanning with accurate tracking. Experimental results are also provided to verify performance in implementation.

DOI 10.1115/1.4030723
2015 Yong YK, Fleming AJ, 'Piezoelectric actuators with integrated high-voltage power electronics', IEEE/ASME Transactions on Mechatronics, 20 611-617 (2015) [C1]

© 2014 IEEE.This paper explores the possibility of piezoelectric actuators with integrated high-voltage power electronics. Such devices dramatically simplify the application of p... [more]

© 2014 IEEE.This paper explores the possibility of piezoelectric actuators with integrated high-voltage power electronics. Such devices dramatically simplify the application of piezoelectric actuators since the power electronics are already optimized for the voltage range, capacitance, and power dissipation of the actuator. The foremost consideration is the thermal impedance of the actuator and heat dissipation. Analytical and finite-element methods are described for predicting the thermal impedance of a piezoelectric bender. The predictions are compared experimentally using thermal imaging on a piezoelectric bender with laminated miniature power electronics.

DOI 10.1109/TMECH.2014.2311040
Citations Scopus - 7Web of Science - 7
Co-authors Yuenkuan Yong
2015 Teo YR, Fleming AJ, 'Optimal integral force feedback for active vibration control', Journal of Sound and Vibration, 356 20-33 (2015) [C1]

© 2015 Elsevier Ltd.Abstract This paper proposes an improvement to Integral Force Feedback (IFF), which is a popular method for active vibration control of structures and mechani... [more]

© 2015 Elsevier Ltd.Abstract This paper proposes an improvement to Integral Force Feedback (IFF), which is a popular method for active vibration control of structures and mechanical systems. Benefits of IFF include robustness, guaranteed stability and simplicity. However, the maximum damping performance is dependent on the stiffness of the system; hence, some systems cannot be adequately controlled. In this paper, an improvement to the classical force feedback control scheme is proposed. The improved method achieves arbitrary damping for any mechanical system by introducing a feed-through term. The proposed improvement is experimentally demonstrated by actively damping an objective lens assembly for a high-speed confocal microscope.

DOI 10.1016/j.jsv.2015.06.046
Citations Scopus - 1Web of Science - 1
2014 Fleming AJ, 'Measuring and predicting resolution in nanopositioning systems', MECHATRONICS, 24 605-618 (2014) [C1]
DOI 10.1016/j.mechatronics.2013.10.003
Citations Scopus - 11Web of Science - 11
2014 Namavar M, Fleming AJ, Aleyaasin M, Nakkeeran K, Aphale SS, 'An Analytical Approach to Integral Resonant Control of Second-Order Systems', IEEE-ASME TRANSACTIONS ON MECHATRONICS, 19 651-659 (2014) [C1]
DOI 10.1109/TMECH.2013.2253115
Citations Scopus - 10Web of Science - 8
2014 Teo YR, Russell D, Aphale SS, Fleming AJ, 'Optimal integral force feedback and structured PI tracking control: Application for objective lens positioner', Mechatronics, 24 701-711 (2014) [C1]

This paper describes a new vibration damping technique based on Integral Force Feedback (IFF). Classical IFF utilizes a force sensor and integral controller to damp the resonance ... [more]

This paper describes a new vibration damping technique based on Integral Force Feedback (IFF). Classical IFF utilizes a force sensor and integral controller to damp the resonance modes of a mechanical system. However, the maximum modal damping depends on the frequency difference between the system's poles and zeros. If the frequency difference is small, the achievable modal damping may be severely limited. The proposed technique allows an arbitrary damping ratio to be achieved by introducing an additional feed-through term to the control system. This results in an extra degree of freedom that allows the position of the zeros to be modified and the maximum modal damping to be increased. The second contribution of this paper is a structured PI tracking controller that is parameterized to cancel the additional pole introduced by integral force feedback. The parameterized controller has only one tuning parameter and does not suffer from reduced phase margin. The proposed techniques are demonstrated on a piezoelectric objective lens positioner. The results show exceptional tracking and damping performance while maintaining insensitivity to changes in resonance frequency. The maximum bandwidth achievable with a commercial PID controller is 26.1 Hz. In contrast, with the proposed damping and tracking controller, the bandwidth is increased to 255 Hz. © 2014 Elsevier Ltd. All rights reserved.

DOI 10.1016/j.mechatronics.2014.04.004
Citations Scopus - 9Web of Science - 9
2013 Fleming AJ, Ninness B, Wills A, 'Recovering the spectrum of a low level signal from two noisy measurements using the cross power spectral density', Review of Scientific Instruments, 84 (2013) [C1]
DOI 10.1063/1.4815982
Co-authors Brett Ninness
2013 Fleming AJ, 'Charge Drive With Active DC Stabilization for Linearization of Piezoelectric Hysteresis', IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, 60 1630-1637 (2013) [C1]
DOI 10.1109/TUFFC.2013.2745
Citations Scopus - 6Web of Science - 5
2013 Fleming AJ, 'A review of nanometer resolution position sensors: Operation and performance', SENSORS AND ACTUATORS A-PHYSICAL, 190 106-126 (2013) [C1]
DOI 10.1016/j.sna.2012.10.016
Citations Scopus - 108Web of Science - 85
2013 Yong YK, Fleming AJ, Moheimani SOR, 'A Novel Piezoelectric Strain Sensor for Simultaneous Damping and Tracking Control of a High-Speed Nanopositioner', IEEE-ASME TRANSACTIONS ON MECHATRONICS, 18 1113-1121 (2013) [C1]
DOI 10.1109/TMECH.2012.2193895
Citations Scopus - 53Web of Science - 42
Co-authors Reza Moheimani, Yuenkuan Yong
2012 Fleming AJ, 'Note: A method for estimating the resolution of nanopositioning systems', Review of Scientific Instruments, 83 086101 (2012) [C1]
Citations Scopus - 8Web of Science - 5
2012 Fleming AJ, 'Getting the message about noise across, loud and clear', IEEE Control Systems, 32 110-124 (2012) [C2]
2012 Heltzel A, Mishra C, Ruoff RS, Fleming A, 'Analysis of an ultrathin graphite-based compact heat exchanger', Heat Transfer Engineering, 33 947-956 (2012)

The emerging production of ultrathin graphite material is applied to thermal management in a numerical comparison of aluminum and graphite-based plate-fin heat exchangers. Conside... [more]

The emerging production of ultrathin graphite material is applied to thermal management in a numerical comparison of aluminum and graphite-based plate-fin heat exchangers. Considering anisotropic thermal conductivity in which out-of-plane transport is about two orders of magnitude lower than in-plane values, the ultrathin graphite-based solution outperforms aluminum by rejecting up to 20% more heat on a volumetric basis. Thermal and hydraulic performance is characterized for both solutions over a range of airflow rates in a notional water/air device. Laminar through fully turbulent regimes are considered. Steady and unsteady three-dimensional (3-D) conjugate simulations reveal a faster equilibration rate for the ultrathin graphite-based solution, minimizing thermal lag that must be accounted for in on-demand electronics cooling. Fin optimization studies predict equivalent conductance with graphite at one-tenth the thickness of aluminum. The combination of improved heat rejection, rapid response rate, and low material density make an ultrathin graphite-based solution uniquely suited to aerospace thermal management. © 2012 Taylor and Francis Group, LLC.

DOI 10.1080/01457632.2012.654727
Citations Scopus - 6
2012 Karpenko M, Bhatt S, Bedrossian N, Fleming A, Ross IM, 'First flight results on time-optimal spacecraft slews', Journal of Guidance, Control, and Dynamics, 35 367-376 (2012)

This paper describes the design and flight implementation of time-optimal attitude maneuvers performed onboard NASA's Transition Region and Coronal Explorer spacecraft. Minimum-ti... [more]

This paper describes the design and flight implementation of time-optimal attitude maneuvers performed onboard NASA's Transition Region and Coronal Explorer spacecraft. Minimum-time reorientation maneuvers have obvious applications for improving the agility of spacecraft systems, yet this type of capability has never before been demonstrated in flight due to the lack of reliable algorithms for generating practical optimal control solutions suitable for flight implementation. Constrained time-optimal maneuvering of a rigid body is studied first, in order to demonstrate the potential for enhancing the performance of the Transition Region and Coronal Explorer spacecraft. Issues related to the experimental flight implementation of time-optimal maneuvers onboard Transition Region and Coronal Explorer are discussed. A description of an optimal control problem that includes practical constraints such as the nonlinear reaction wheel torque-momentum envelope and rate gyro saturation limits is given. The problem is solved using the pseudospectral optimal control theory implemented in the MATLAB ® software DIDO. Flight results, presented for a typical large-angle time-optimal reorientation maneuver, show that the maneuvers can be implemented without any modification of the existing spacecraft attitude control system. A clear improvement in spacecraft maneuver performance as compared with conventional eigenaxis maneuvering is demonstrated. Copyright © 2011 by Mark Karpenko, Sagar Bhatt, Nazareth Bedrossian, Andy Fleming, and I. Michael Ross.

DOI 10.2514/1.54937
Citations Scopus - 20
2012 Fleming AJ, 'Energy optimized aircraft and equipment systems', Aerospace America, 50 71 (2012)
2011 Kenton BJ, Fleming AJ, Leang KK, 'Compact ultra-fast vertical nanopositioner for improving scanning probe microscope scan speed', Review of Scientific Instruments, 82 123703 (2011) [C1]
DOI 10.1063/1.3664613
Citations Scopus - 50Web of Science - 28
2011 Fairbairn MW, Moheimani SO, Fleming AJ, 'Q control of an atomic force microscope microcantilever: A sensorless approach', Journal of Microelectromechanical Systems, 20 1372-1381 (2011) [C1]
DOI 10.1109/JMEMS.2011.2168809
Citations Scopus - 29Web of Science - 23
Co-authors Reza Moheimani
2011 Fleming AJ, 'Dual-stage vertical feedback for high-speed scanning probe microscopy', IEEE Transactions on Control Systems Technology, 19 156-165 (2011) [C1]
DOI 10.1109/TCST.2010.2040282
Citations Scopus - 54Web of Science - 44
2011 Sekhavat P, Yan H, Fleming A, Ross IM, Alfriend KT, 'Closed-loop time-optimal attitude maneuvering of magnetically actuated spacecraft', Journal of the Astronautical Sciences, 58 81-97 (2011)

This paper examines the performance of the pseudospectral optimal control scheme for closed-loop time-optimal attitude maneuvering of the NPSAT1 spacecraft, a magnetically actuate... [more]

This paper examines the performance of the pseudospectral optimal control scheme for closed-loop time-optimal attitude maneuvering of the NPSAT1 spacecraft, a magnetically actuated spacecraft designed and built at the Naval Postgraduate School. The closed-loop control is devised and implemented using the notion of Carathéodory-p solutions: repeated computation and update of the complete open-loop control solution in real-time. The performance of the pseudospectral feedback-control scheme is compared to a standard state feedback-control technique. It is shown that the use of standard state feedback control leads to significantly slower convergence time and may lead to substantially lower performance metrics. The substantial performance gains when using closed-loop optimal control are attributed to the optimal scheme's ability to exploit the full maneuverability envelope of the spacecraft by applying bang-bang controls in all three directions. In contrast, traditional gain-based feedback control laws substantially limit the performance of the vehicle to well below its physical capabilities. The feasibility of each open-loop optimal control solution is verified by numerical propagation while Pontryagin's necessary conditions for optimality are used to verify the solution's optimality.

Citations Scopus - 2
2010 Fleming AJ, Aphale SS, Moheimani SO, 'A new method for robust damping and tracking control of scanning probe microscope positioning stages', IEEE Transactions on Nanotechnology, 9 438-448 (2010) [C1]
DOI 10.1109/TNANO.2009.2032418
Citations Scopus - 106Web of Science - 90
Co-authors Reza Moheimani
2010 Fleming AJ, 'Quantitative scanning probe microscope topographies by charge linearization of the vertical actuator', Review of Scientific Instruments, 81 103701 (2010) [C1]
DOI 10.1063/1.3488359
Citations Scopus - 11Web of Science - 10
2010 Fleming AJ, Kenton BJ, Leang KK, 'Bridging the gap between conventional and video-speed scanning probe microscopes', Ultramicroscopy, 110 1205-1214 (2010) [C1]
DOI 10.1016/j.ultramic.2010.04.016
Citations Scopus - 61Web of Science - 55
2010 Fleming AJ, Leang KK, 'Integrated strain and force feedback for high-performance control of piezoelectric actuators', Sensors and Actuators A: Physical, 161 256-265 (2010) [C1]
DOI 10.1016/j.sna.2010.04.008
Citations Scopus - 69Web of Science - 53
2010 Fleming AJ, 'Nanopositioning system with force feedback for high-performance tracking and vibration control', IEEE-ASME Transactions on Mechatronics, 15 433-447 (2010) [C1]
DOI 10.1109/TMECH.2009.2028422
Citations Scopus - 100Web of Science - 74
2010 Fleming AJ, Thomas SK, Yerkes KL, 'Titanium-water loop heat pipe operating characteristics under standard and elevated acceleration fields', Journal of Thermophysics and Heat Transfer, 24 184-198 (2010)

An experiment has been developed to examine the behavior of a titanium-water loop heat pipe under standard and elevated acceleration fields. The loop heat pipe was mounted on a 2.... [more]

An experiment has been developed to examine the behavior of a titanium-water loop heat pipe under standard and elevated acceleration fields. The loop heat pipe was mounted on a 2.44 meter-diameter centrifuge table on edge with heat applied to the evaporator via a mica heater and heat rejected using a high-temperature polyalphaolefin oil coolant loop. The loop heat pipe was tested under the following parametric ranges: heat load at the evaporator 100 = Qin = 600 W, heat load at the compensation chamber 0 = Qcc = 50 W, radial acceleration 0 = ar = 10 g. For stationary operation, the evaporative heat transfer coefficient decreased monotonically with heat load whereas the thermal resistance decreased to a minimum then increased. Heat input to the compensation chamber was found to increase the evaporative heat transfer coefficient and decrease the thermal resistance for Qin = 500 W. Transient periodic flow reversal in the loop heat pipe was found for some cases, which was likely due to vapor bubble formation in the primary wick. Operation in an elevated acceleration environment revealed that dry out was dependent on both Qin and ar, and the ability for the loop heat pipe to reprime after an acceleration event that induced dry out was influenced by the evaporator temperature. The evaporative heat transfer coefficient and thermal resistance were found not to be significantly dependent on radial acceleration. However, the evaporator wall superheat was found to increase slightly with radial acceleration at high heat loads.

DOI 10.2514/1.45684
Citations Scopus - 11
2009 Leang KK, Fleming AJ, 'High-speed serial-kinematic SPM scanner: Design and drive considerations', Asian Journal of Control, 11 144-153 (2009) [C1]
DOI 10.1002/asjc.090
Citations Scopus - 76Web of Science - 66
2009 Fleming AJ, 'A megahertz bandwidth dual amplifier for driving piezoelectric actuators and other highly capacitive loads', Review of Scientific Instruments, 80 (2009) [C1]
DOI 10.1063/1.3234261
Citations Scopus - 14Web of Science - 9
2009 Fleming AJ, Wills AG, 'Optimal periodic trajectories for band-limited systems', IEEE Transactions on Control Systems Technology, 17 552-562 (2009) [C1]
DOI 10.1109/tcst.2008.2001375
Citations Scopus - 36Web of Science - 29
2008 Wills AG, Bates DR, Fleming AJ, Ninness BM, Moheimani SO, 'Model predictive control applied to constraint handling in active noise and vibration control', IEEE Transactions on Control Systems Technology, 16 3-12 (2008) [C1]
DOI 10.1109/tcst.2007.903062
Citations Scopus - 80Web of Science - 53
Co-authors Brett Ninness, Reza Moheimani
2008 Fleming AJ, Wills AG, Moheimani SO, 'Sensor fusion for improved control of piezoelectric tube scanners', IEEE Transactions on Control Systems Technology, 16 1265-1276 (2008) [C1]
DOI 10.1109/tcst.2008.921798
Citations Scopus - 47Web of Science - 35
Co-authors Reza Moheimani
2008 Maess J, Fleming AJ, Allgoewer F, 'Simulation of dynamics-coupling in piezoelectric tube scanners by reduced order finite element analysis', Review of Scientific Instruments, 79 (2008) [C1]
DOI 10.1063/1.2826428
Citations Scopus - 28Web of Science - 18
2008 Ross IM, Sekhavat P, Fleming A, Gong Q, 'Optimal feedback control: Foundations, examples, and experimental results for a new approach', Journal of Guidance, Control, and Dynamics, 31 307-321 (2008)

Typical optimal feedback controls are nonsmooth functions. Nonsmooth controls raise fundamental theoretical problems on the existence and uniqueness of state trajectories. Many of... [more]

Typical optimal feedback controls are nonsmooth functions. Nonsmooth controls raise fundamental theoretical problems on the existence and uniqueness of state trajectories. Many of these problems are frequently addressed in control applications through the concept of a Filippov solution. In recent years, the simpler concept of a p solution has emerged as a practical and powerful means to address these theoretical issues. In this paper, we advance the notion of Carathéodory-p solutions that stem from the equivalence between closed-loop and feedback trajectories. In recognizing that feedback controls are not necessarily closed-form expressions, we develop a sampling theorem that indicates that the Lipschitz constant of the dynamics is a fundamental sampling frequency. These ideas lead to a new set of foundations for achieving feedback wherein optimality principles are interwoven to achieve stability and system performance, whereas the computation of optimal controls is at the level of first principles. We demonstrate these principles by way of pseudospectral methods because these techniques can generate Carathéodory-p solutions at a sufficiently fast sampling rate even when implemented in a MATLAB® environment running on legacy computer hardware. To facilitate an exposition of the proposed ideas to a wide audience, we introduce the core principles only and relegate the intricate details to numerous recent references. These principles are then applied to generate pseudospectral feedback controls for the slew maneuvering of NPSAT1, a spacecraft conceived, designed, and built at the Naval Postgraduate School and scheduled to be launched in fall 2007.

DOI 10.2514/1.29532
Citations Scopus - 65
2008 Fleming AJ, Leang KK, 'Charge drives for scanning probe microscope positioning stages', Ultramicroscopy, 108 1551-1557 (2008) [C1]
DOI 10.1016/j.ultramic.2008.05.004
Citations Scopus - 59Web of Science - 53
2008 Clayton GM, Tien S, Fleming AJ, Moheimani SO, Devasia S, 'Inverse-feedforward of charge-controlled piezopositioners', Mechatronics, 18 273-281 (2008) [C1]
DOI 10.1016/j.mechatronics.2007.07.006
Citations Scopus - 60Web of Science - 54
Co-authors Reza Moheimani
2007 Aphale SS, Fleming AJ, Moheimani SO, 'High speed nano-scale positioning using a piezoelectric tube actuator with active shunt control', Micro and Nano Letters, 2 9-12 (2007) [C1]
DOI 10.1049/mnl:20065075
Citations Scopus - 44Web of Science - 38
Co-authors Reza Moheimani
2007 Aphale SS, Fleming AJ, Moheimani SO, 'Integral resonant control of collocated smart structures', Smart Materials & Structures, 16 439-446 (2007) [C1]
DOI 10.1088/0964-1726/16/2/023
Citations Scopus - 124
Co-authors Reza Moheimani
2007 Fleming AJ, Niederberger D, Moheimani SO, Morari M, 'Control of resonant acoustic sound fields by electrical shunting of a loudspeaker', IEEE Transactions on Control Systems Technology, 15 689-703 (2007) [C1]
DOI 10.1109/tcst.2006.890276
Citations Scopus - 27Web of Science - 11
Co-authors Reza Moheimani
2007 Bhikkaji B, Ratnam MR, Fleming AJ, Moheimani SO, 'High-performance control of piezoelectric tube scanners', IEEE Transactions on Control Systems Technology, 15 853-866 (2007) [C1]
DOI 10.1109/tcst.2007.902947
Citations Scopus - 123Web of Science - 101
Co-authors Reza Moheimani
2007 Aphale SS, Fleming AJ, Moheimani SO, 'Integral control of collocated smart structures', Proceedings of SPIE, 6525 1-11 (2007) [C1]
DOI 10.1117/12.715477
Co-authors Reza Moheimani
2006 Fleming AJ, Moheimani SO, 'Sensorless vibration suppression and scan compensation for piezoelectric tube nanopositioners', IEEE Transactions on Control Systems Technology, 14 33-44 (2006) [C1]
DOI 10.1109/TCST.2005.860511
Citations Scopus - 152Web of Science - 120
Co-authors Reza Moheimani
2006 Fleming AJ, Behrens S, Moheimani SOR, 'Inertial vibration control using a shunted electromagnetic transducer (vol 11, pg 84, 2006)', IEEE-ASME TRANSACTIONS ON MECHATRONICS, 11 367-367 (2006)
DOI 10.1109/TMECH.2006.878790
Citations Web of Science - 1
Co-authors Reza Moheimani
2006 Fleming AJ, Moheimani SO, 'Inertial vibration control using a shunted electromagnetic transducer', IEEE-ASME Transactions on Mechatronics, 11 84-92 (2006) [C1]
DOI 10.1109/TMECH.2005.863364
Citations Scopus - 15Web of Science - 18
Co-authors Reza Moheimani
2006 Niederberger D, Behrens S, Fleming AJ, Moheimani SO, Morari M, 'Adaptive electromagnetic shunt damping', IEEE-ASME Transactions on Mechatronics, 11 103-108 (2006) [C1]
DOI 10.1109/TMECH.2005.859844
Citations Scopus - 21Web of Science - 19
Co-authors Reza Moheimani
2005 Fleming AJ, Moheimani SOR, 'Sensor-less vibration suppression and scan compensation for piezoelectric tube nanopositioners', 2005 44th IEEE Conference on Decision and Control & European Control Conference, Vols 1-8, 1162-1167 (2005)
Co-authors Reza Moheimani
2005 Fleming AJ, Moheimani SO, 'Control oriented synthesis of high-performance piezoelectric shunt impedances for structural vibration control', IEEE Transactions on Control Systems Technology, 13 98-112 (2005) [C1]
DOI 10.1109/TCST.2004.838547
Citations Scopus - 50Web of Science - 39
Co-authors Reza Moheimani
2005 Fleming AJ, Moheimani SO, Behrens S, 'Synthesis and implementation of sensor-less active shunt controllers for electromagnetically actuated systems', IEEE Transactions on Control Systems Technology, 13 246-261 (2005) [C1]
DOI 10.1109/TCST.2004.839565
Citations Scopus - 16Web of Science - 13
Co-authors Reza Moheimani
2005 Behrens S, Fleming AJ, Moheimani SO, 'Passive vibration control via electromagnetic shunt damping', IEEE-Asme Transactions on Mechatronics, 10 118-122 (2005) [C1]
DOI 10.1109/TMECH.2004.835341
Citations Scopus - 49Web of Science - 43
Co-authors Reza Moheimani
2005 Fleming AJ, Moheimani SO, 'A grounded-load charge amplifier for reducing hysteresis in piezoelectric tube scanners', Review of Scientific Instruments, 76 (2005) [C1]
DOI 10.1063/1.1938952
Citations Scopus - 96Web of Science - 80
Co-authors Reza Moheimani
2004 Fleming AJ, Moheimani SOR, 'Optimal impedance design for piezoelectric vibration control', 2004 43RD IEEE CONFERENCE ON DECISION AND CONTROL (CDC), VOLS 1-5, 2596-2601 (2004)
DOI 10.1109/CDC.2004.1428849
Citations Scopus - 10Web of Science - 5
Co-authors Reza Moheimani
2004 Niederberger D, Fleming AJ, Moheimani SO, Morari M, 'Adaptive multi-mode resonant piezoelectric shunt dampening', Smart Materials and Structures, 1025-1035 (2004) [C1]
DOI 10.1088/0964-1726/13/5/007
Citations Scopus - 74Web of Science - 64
Co-authors Reza Moheimani
2004 Moheimani SO, Fleming AJ, 'Improved current and charge amplifiers for driving piezoelectric loads, and issues in signal processing design for synthesis of shunt damping circuits', Journal of Intelligent Material Systems and Structures, 15 77-92 (2004) [C1]
DOI 10.1177/1045389X04039701
Citations Scopus - 44Web of Science - 38
Co-authors Reza Moheimani
2004 Moheimani SO, Fleming AJ, Behrens S, 'Dynamics, stability and control of multivariable piezoelectric shunts', IEEE ASME Transactions on Mechatronics, 9 87-99 (2004) [C1]
DOI 10.1109/TMECH.2004.823882
Citations Scopus - 12Web of Science - 7
Co-authors Reza Moheimani
2003 Fleming AJ, Moheimani SO, 'Precision current and charge amplifiers for driving highly capacitive piezoelectric loads', Electronic Letters, 39 282-284 (2003) [C1]
DOI 10.1049/el:20030235
Citations Scopus - 53Web of Science - 45
Co-authors Reza Moheimani
2003 Behrens S, Moheimani SO, Fleming AJ, 'Multiple mode current flowing passive piezoelectric shunt controller', Journal of Sound and Vibration, 266 929-942 (2003) [C1]
DOI 10.1016/S0022-460X(02)01380-9
Citations Scopus - 87Web of Science - 66
Co-authors Reza Moheimani
2003 Behrens S, Fleming AJ, Moheimani SO, 'A broadband controller for shunt piezoelectric damping of structural vibration', Smart Materials and Structures, 12 18-28 (2003) [C1]
DOI 10.1088/0964-1726/12/1/303
Citations Scopus - 117Web of Science - 99
Co-authors Reza Moheimani
2003 Fleming AJ, Moheimani SO, 'Adaptive piezoelectric shunt damping', Smart Materials and Structures, 12 36-48 (2003) [C1]
DOI 10.1088/0964-1726/12/1/305
Citations Scopus - 9Web of Science - 53
Co-authors Reza Moheimani
2003 Fleming AJ, Behrens S, Moheimani SO, 'Reducing the inductance requirements of piezolelectric shunt dampening systems', Smart Materials and Structures, 12 57-64 (2003) [C1]
DOI 10.1088/0964-1726/12/1/307
Citations Scopus - 57Web of Science - 45
Co-authors Reza Moheimani
2003 Moheimani SO, Fleming AJ, Behrens S, 'On the feedback structure of wideband piezoelectric shunt damping systems', Smart Materials and Structures, 12 49-56 (2003) [C1]
DOI 10.1088/0964-1726/12/1/306
Citations Scopus - 44Web of Science - 37
Co-authors Reza Moheimani
2003 Fleming AJ, Moheimani SO, 'Spatial system identification of a simply supported beam and a trapezoidal cantilever plate', IEEE Transactions on control systems technology, 11 726-736 (2003) [C1]
DOI 10.1109/TCST.2003.816415
Citations Scopus - 13Web of Science - 13
Co-authors Reza Moheimani
2002 Fleming A, Moheimani SOR, 'Spatial system identification of a simply supported beam and a trapezoidal cantilever plate.', PROCEEDINGS OF THE 41ST IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-4, 4515-4520 (2002)
Co-authors Reza Moheimani
2002 Fleming AJ, Behrens S, Moheimani SO, 'Optimization and Implementation of Multimode Piezoelectric Shunt Damping Systems', IEEE/ASME Transactions on Mechatronics, 7 87-94 (2002) [C1]
DOI 10.1109/3516.990891
Citations Scopus - 101Web of Science - 80
Co-authors Reza Moheimani
2002 McKelvey T, Fleming AJ, Moheimani SO, 'Subspace based system identification for an acoustic enclosure', Journal of Vibration and Acoustics, 124 1-16 (2002) [C1]
Co-authors Reza Moheimani
2001 Moheimani SO, Fleming AJ, Behrens S, 'Highly resonant controller for multimode piezoelectric shunt damping', Electronic Letters, 37 No 25 1505-1506 (2001) [C1]
Citations Scopus - 11Web of Science - 11
Co-authors Reza Moheimani
2001 Fleming AJ, Behrens S, Moheimani SOR, 'Innovations in piezoelectric shunt damping', SMART STRUCTURES AND DEVICES, 4235 89-101 (2001)
DOI 10.1117/12.420891
Citations Scopus - 2Web of Science - 2
Co-authors Reza Moheimani
2001 Behrens S, Fleming AJ, Moheimani SOR, 'New method for multiple-mode shunt damping of structural vibration using a single piezoelectric transducer', SMART STRUCTURES AND MATERIALS 2001: DAMPING AND ISOLATION, 4331 239-250 (2001)
DOI 10.1117/12.432707
Citations Scopus - 34Web of Science - 29
Co-authors Reza Moheimani
2000 Fleming AJ, Behrens S, Moheimani SO, 'Synthetic impedance for implementation of piezoelectric shunt-damping circuits', Electronics Letters, 36, no 18 1525-1526 (2000) [C1]
DOI 10.1049/el:20001083
Citations Scopus - 98Web of Science - 90
Co-authors Reza Moheimani
2000 McKelvey T, Fleming A, Moheimani SOR, 'Subspace based system identification for an acoustic enclosure', PROCEEDINGS OF THE 2000 IEEE INTERNATIONAL CONFERENCE ON CONTROL APPLICATIONS, 255-260 (2000)
DOI 10.1109/CCA.2000.897433
Citations Scopus - 3Web of Science - 1
Co-authors Reza Moheimani
Show 76 more journal articles

Conference (107 outputs)

Year Citation Altmetrics Link
2016 Eielsen AA, Fleming AJ, 'Improving DAC resolution in closed-loop control of precision mechatronic systems using dithering', 2016 IEEE 55th Conference on Decision and Control, CDC 2016 (2016) [E1]
DOI 10.1109/CDC.2016.7798374
Co-authors Arnfinnaas Eielsen
2016 de Rozario R, Fleming AJ, Oomen T, 'Iterative Control for Periodic Tasks with Robustness Considerations, Applied to a Nanopositioning Stage', IFAC-PapersOnLine (2016) [E1]
DOI 10.1016/j.ifacol.2016.10.670
2016 Rios SA, Fleming AJ, Yong YK, 'Design and characterization of a miniature monolithic piezoelectric hexapod robot', IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM (2016) [E1]
DOI 10.1109/AIM.2016.7576897
Co-authors Yuenkuan Yong
2016 Fleming AJ, Wills A, Ghalehbeygi OT, Routley B, Ninness B, 'A Nonlinear Programming Approach to Exposure Optimization in Scanning Laser Lithography', 2016 AMERICAN CONTROL CONFERENCE (ACC) (2016) [E1]
Citations Scopus - 1
Co-authors Brett Ninness
2016 Teo YR, Yong YK, Fleming AJ, 'A Review of Scanning Methods and Control Implications for Scanning Probe Microscopy', 2016 AMERICAN CONTROL CONFERENCE (ACC) (2016) [E1]
Co-authors Yuenkuan Yong
2016 Ragazzon MRP, Gravdahl JT, Fleming AJ, 'On Amplitude Estimation for High-Speed Atomic Force Microscopy', Proceedings of the American Control Conference ACC 2016 (2016) [E1]
DOI 10.1109/ACC.2016.7525314
Citations Scopus - 1
2016 Fleming AJ, Berriman G, Yong YK, 'Design, Modeling, and Characterization of an XY Nanopositioning Stage Constructed from a Single Sheet of Piezoelectric Material', 2016 IEEE INTERNATIONAL CONFERENCE ON ADVANCED INTELLIGENT MECHATRONICS (AIM) (2016) [E1]
Co-authors Yuenkuan Yong
2016 Eielsen AA, Fleming AJ, 'Experimental assessment of dynamic digital-to-analog converter performance for applications in precision mechatronic systems', 2016 Australian Control Conference, AuCC 2016 (2016) [E1]
DOI 10.1109/AUCC.2016.7868211
Co-authors Arnfinnaas Eielsen
2016 Routley B, Fleming A, 'High sensitivity interferometer for on-axis detection of AFM cantilever deflection', 2016 International Conference on Manipulation, Automation and Robotics at Small Scales, MARSS 2016 (2016) [E1]

© 2016 IEEE.A homodyne path stabilised Michelson based interferometer displacement sensor was developed. This sensor achieved a noise floor of 100 fm/vHz, for frequencies higher ... [more]

© 2016 IEEE.A homodyne path stabilised Michelson based interferometer displacement sensor was developed. This sensor achieved a noise floor of 100 fm/vHz, for frequencies higher than 100 KHz. A prototype AFM that integrated this sensor was developed. Using tapping mode, topography maps of an AFM test grid were produced.

DOI 10.1109/MARSS.2016.7561714
2015 Teo YR, Eielsen AA, Fleming AJ, 'Model-less FIR repetitive control with consideration of uncertainty', 2015 IEEE Conference on Control and Applications, CCA 2015 - Proceedings (2015) [E1]

© 2015 IEEE.Repetitive control (RC) is used to track and reject periodic exogenous signals by including a model of a periodic signal in the feedback path. The performance of RC c... [more]

© 2015 IEEE.Repetitive control (RC) is used to track and reject periodic exogenous signals by including a model of a periodic signal in the feedback path. The performance of RC can be improved by also including an. The accuracy of this filter is the main limitation to the RC bandwidth. The bandwidth is typically limited with a robustness filter - often a low-pass filter which attenuates the model at high-frequencies where the model-mismatch often occurs. In this paper, two robustness filter designs are compared. The first design is a brick-wall low-pass filter commonly used in the literature. The second design is based on the uncertainty between the inverse plant response filter and the measured response of the system. Experimental results demonstrate that the proposed method outperforms the traditional brick-wall filter approach.

DOI 10.1109/CCA.2015.7320670
Co-authors Arnfinnaas Eielsen
2015 Godfrey TD, Eielsen AA, Fleming AJ, IEEE, 'Digital-to-analog Converter Considerations for Achieving a Dynamic Range of 1 ppm in Precision Mechatronics Systems', 2015 IEEE CONFERENCE ON CONTROL AND APPLICATIONS (CCA 2015) (2015) [E1]
Co-authors Arnfinnaas Eielsen
2015 Fleming AJ, Routley B, Holdsworth JL, 'A closed-loop phase-locked interferometer for wide bandwidth position sensing', 2015 IEEE Conference on Control and Applications, CCA 2015 - Proceedings (2015) [E1]

© 2015 IEEE.This article describes a position sensitive interferometer with closed-loop control of the reference mirror. A calibrated nanopositioner is used to lock the interfero... [more]

© 2015 IEEE.This article describes a position sensitive interferometer with closed-loop control of the reference mirror. A calibrated nanopositioner is used to lock the interferometer phase to the most sensitive point in the interferogram. In this configuration, large low-frequency movements of the sensor mirror can be detected from the control signal applied to the nanopositioner and high-frequency short-range signals can be measured directly from the photodiode. It is demonstrated that these two signals are complementary and can be summed to find the total displacement. The resulting interferometer has a number of desirable characteristics, it is optically simple, does not require polarization or modulation to detect the direction of motion, does not require fringe-counting or interpolation electronics, and has an effectively unlimited bandwidth. Experimental results demonstrate the frequency response analysis of a high-speed positioning stage. The proposed instrument is ideal for measuring the frequency response of nanopositioners, electro-optical components, MEMs devices, Ultrasonic devices, and sensors such as surface acoustic wave detectors.

DOI 10.1109/CCA.2015.7320668
Citations Scopus - 1
Co-authors John Holdsworth
2015 Ghalehbeygi OT, Berriman G, Fleming AJ, Holdsworth JL, IEEE, 'Optimization and Simulation of Exposure Pattern for Scanning Laser Lithography', 2015 IEEE CONFERENCE ON CONTROL AND APPLICATIONS (CCA 2015) (2015) [E1]
Citations Scopus - 2Web of Science - 1
Co-authors John Holdsworth
2015 Routley BS, Holdsworth JL, Fleming AJ, 'Optimization of Near-Field Scanning Optical Lithography', ALTERNATIVE LITHOGRAPHIC TECHNOLOGIES VII (2015) [E1]
DOI 10.1117/12.2086073
Citations Scopus - 2Web of Science - 1
Co-authors John Holdsworth
2015 Rios SA, Fleming AJ, Yong YK, 'Design of a two degree of freedom resonant miniature robotic leg', IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM (2015) [E1]

© 2015 IEEE. This article identifies the design considerations for a two degree of freedom (DoF) miniature robotic leg utilizing piezoelectric bimorph actuators with a specific f... [more]

© 2015 IEEE. This article identifies the design considerations for a two degree of freedom (DoF) miniature robotic leg utilizing piezoelectric bimorph actuators with a specific focus on the resonance modes of the system. An analytical model was developed using three independent lumped mass models with superposition for tuning the resonance frequencies and optimizing the performance of the leg. The model was verified both experimentally and using finite element analysis (FEA).

DOI 10.1109/AIM.2015.7222551
Citations Scopus - 3Web of Science - 2
Co-authors Yuenkuan Yong
2014 Islam MN, Fleming AJ, 'A Novel and Compatible Sensing Coil for a Capsule in Wireless Capsule Endoscopy for Real Time Localization', IEEE Sensors 2014 Proceedings (2014) [E1]
DOI 10.1109/ICSENS.2014.6985326
Citations Scopus - 1
2014 Teo YR, Russell D, Aphale SS, Fleming AJ, 'Optimal Integral Force Feedback and Structured PI Tracking Control: Application for High Speed Confocal Microscopy', Proceedings of the 19th IFAC World Congress (2014) [E1]
DOI 10.3182/20140824-6-ZA-1003.00297
Citations Scopus - 1
2014 Russell D, Fleming AJ, Aphale SS, 'Improving the positioning bandwidth of the Integral Resonant Control Scheme through strategic zero placement', Proceedings of the 19th IFAC World Congress (2014) [E1]
DOI 10.3182/20140824-6-ZA-1003.00191
2014 Rios SA, Fleming AJ, 'A Novel Electrical Configuration for Three Wire Piezoelectric Bimorph Micro-Positioners', 2014 IEEE/ASME International Conference on Advanced Intelligent Mechatronics AIM (2014) [E1]
Citations Scopus - 3Web of Science - 3
2014 Teo YR, Fleming AJ, 'Active damping control using optimal Integral Force Feedback', Proceedings of the 2014 American Control Conference (2014) [E1]
DOI 10.1109/ACC.2014.6858699
2014 Russell D, Fleming AJ, Aphale SS, 'Simultaneous optimization of damping and tracking controller parameters via selective pole placement for enhanced positioning bandwidth of nanopositioners', Proceedings of the 2014 American Control Conference (2014) [E1]
DOI 10.1109/ACC.2014.6858694
Citations Scopus - 2
2014 Teo YR, Fleming AJ, 'A new repetitive control scheme based on non-causal FIR filters', Proceedings of the 2014 American Control Conference (2014) [E1]
DOI 10.1109/ACC.2014.6858916
Citations Scopus - 4Web of Science - 1
2014 Teo YR, Eielsen AA, Gravdahl TJ, Fleming AJ, 'Discrete-time repetitive control with model-less FIR filter inversion for high performance nanopositioning', 2014 IEEE/ASME International Conference on Advanced Intelligent Mechatronics AIM (2014) [E1]
Citations Scopus - 4Web of Science - 3
Co-authors Arnfinnaas Eielsen
2013 Teo YR, Fleming AJ, 'Resolution of sensors with capacitive source impedance', IEEE SENSORS 2013 - Proceedings (2013) [E2]
DOI 10.1109/ICSENS.2013.6688584
2013 Fleming AJ, Ninness B, Wills AG, 'Spectral estimation using dual sensors with uncorrelated noise', IEEE SENSORS 2013 - Proceedings (2013) [E2]
DOI 10.1109/ICSENS.2013.6688583
Co-authors Brett Ninness
2013 Fleming AJ, Yong YK, 'Thermal Analysis of Piezoelectric Benders with Laminated Power Electronics', 2013 IEEE/ASME International Conference On Advanced Intelligent Mechatronics (AIM): Mechatronics For Human Wellbeing (2013) [E1]
Co-authors Yuenkuan Yong
2013 Fleming AJ, 'Precision Charge Drive with Low Frequency Voltage Feedback for Linearization of Piezoelectric Hysteresis', Proceedings of the 2013 American Control Conference ACC (2013) [E1]
2013 Fleming AJ, Leang KK, 'An experimental comparison of PI, inversion, and damping control for high performance nanopositioning', Proceedings of the American Control Conference (2013) [E1]
Citations Scopus - 1Web of Science - 1
2013 Namavar M, Aphale SS, Fleming AJ, 'Resonance-shifting integral resonant control scheme for increasing the positioning bandwidth of nanopositioners', 2013 European Control Conference, ECC 2013 (2013) [E1]
Citations Scopus - 3
2013 Fleming AJ, 'Position sensor performance in nanometer resolution feedback systems', Proceedings of the 6th IFAC Symposium on Mechatronic Systems (2013) [E1]
DOI 10.3182/20130410-3-CN-2034.00010
2013 Fleming AJ, 'Time domain resolution of nanopositioning systems', Proceedings of the 6th IFAC Symposium on Mechatronic Systems (2013) [E1]
DOI 10.3182/20130410-3-CN-2034.00011
2013 Fleming AJ, Ninness B, Wills AG, 'Spectral Estimation using Dual Sensors with Uncorrelated Noise', 2013 IEEE SENSORS (2013)
Co-authors Brett Ninness
2012 Fleming AJ, 'Estimating the resolution of nanopositioning systems from frequency domain data', 2012 IEEE International Conference on Robotics and Automation (ICRA) (2012) [E1]
Citations Scopus - 6
2012 Pitis CD, Fleming A, Zeller M, 'Power savings obtained with integrated industrial system drives', SysCon 2012 - 2012 IEEE International Systems Conference, Proceedings (2012)

Numerous scientific and official documents stress that energy efficiency improvements can play a key role in both assuring a sustainable energy future and mitigating climate chang... [more]

Numerous scientific and official documents stress that energy efficiency improvements can play a key role in both assuring a sustainable energy future and mitigating climate change through socio-economic development. Last World Summit in Durban concluded that changing unsustainable patterns of energy use is a key area for global action to ensure the survival of our planet. This paper proposes a new Concept of five (5) Essentials of Application Engineering, (5 EAE), which would enable designers, manufacturers, and end-users to consistently design and evaluate any design or retrofits of power converters and/or industrial system drives. Five (5) essentials of application engineering have already been successful in designing and manufacturing integrated industrial system drives (IISD), and has created new basis-of-design for drives in mining and heavy industries in South Africa. 5 EAE, as a concept, produces several collateral benefits: 1) An increased technical and economic performance of processes; 2) The defusing of incipient energy and economic crisis; 3) An improvement of environmental conditions; and 4) The creation of jobs in industries. Consequently, 5 EAE can be used as a model for improving a company's corporate policies and/or utilities, and government energy policies. © 2012 IEEE.

DOI 10.1109/SysCon.2012.6189440
Citations Scopus - 2
2011 Fairbairn MW, Moheimani SO, Fleming AJ, 'Passive piezoelectric shunt control of an atomic force microscope microcantilever', 2011 IEEE/ASME International Conference on Advanced Intelligent Mechatronics: AIM2011 (2011) [E1]
DOI 10.1109/AIM.2011.6026982
Citations Scopus - 2Web of Science - 1
Co-authors Reza Moheimani
2011 Yong YK, Fleming AJ, Moheimani SO, 'Vibration and tracking control of a flexure-guided nanopositioner using a Piezoelectric strain sensor', First International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-Nano 2011) (2011) [E2]
Co-authors Reza Moheimani, Yuenkuan Yong
2011 Fairbairn MW, Moheimani SO, Fleming AJ, 'Improving the scan rate and image quality in tapping mode atomic force microscopy with piezoelectric shunt control', Proceedings of the 2011 Australian Control Conference, AUCC 2011 (2011) [E1]
Citations Scopus - 2
Co-authors Reza Moheimani
2011 Fleming AJ, 'A method for reducing piezoelectric non-linearity in scanning probe microscope images', Proceedings of the 2011 American Control Conference (2011) [E1]
Citations Scopus - 5Web of Science - 4
2011 Heltzel A, Mishra C, Ruoff RS, Fleming A, 'Analysis of a graphene/ultrathin graphite heat exchanger for aerospace thermal management', ASME/JSME 2011 8th Thermal Engineering Joint Conference, AJTEC 2011 (2011)

Fast evolving techniques for macroscale graphene and ultrathin graphite material production are promising for applications of graphene-based materials in thermal management. A num... [more]

Fast evolving techniques for macroscale graphene and ultrathin graphite material production are promising for applications of graphene-based materials in thermal management. A numerical comparison of aluminium and graphene-based plate-fin heat exchangers is conducted. Anisotropic thermal conductivity of graphene-based solution shows an improvement of up to twenty percent in heat rejection over the aluminium design. Thermal and hydraulic performance is characterized for both designs over a range of air flow rates in both laminar and turbulent regimes. Steady and unsteady 3-D conjugate simulations reveal a faster equilibration rate for the graphene-based solution, minimizing thermal lag that must be accounted for in on-demand electronics cooling. The combination of improved heat rejection, rapid response rate, and low material density make a graphene-based solution uniquely suited to aerospace thermal management. Copyright © 2011 by ASME.

2011 Karpenko M, Bedrossian N, Bhatt S, Fleming A, Ross IM, 'First flight results on time-optimal spacecraft slews', Advances in the Astronautical Sciences (2011)

This paper describes the design and flight implementation of off-eigenaxis time-optimal reorientation maneuvers for the NASA Transition Region and Coronal Explorer (TRACE) spacecr... [more]

This paper describes the design and flight implementation of off-eigenaxis time-optimal reorientation maneuvers for the NASA Transition Region and Coronal Explorer (TRACE) spacecraft. Time-optimal reorientation maneuvers have obvious application for improving the maneuver performance of spacecraft systems. Yet, this type of maneuvering capability has never before been demonstrated in flight. Constrained time-optimal maneuvering of a rigid body is studied first in order to demonstrate the potential for enhancing the performance of the TRACE spacecraft. Issues related to the experimental flight implementation of time-optimal maneuvers on board TRACE are discussed. A description of an optimal control problem formulation found to be suitable for reaction wheel spacecraft maneuver design is given. The optimizationmodel is solved using the pseudospectral optimal controlmethod and includes practical constraints such as the nonlinear reaction wheel torque-momentum envelope and rate gyro saturation limits. Flight results, presented for a typical large angle time-optimal reorientation maneuver, show that time-optimal maneuvers can be implemented without any modification of the existing spacecraft attitude control system and demonstrate a clear improvement in spacecraft maneuver performance as compared to conventional eigenaxis maneuvering.

Citations Scopus - 5
2011 Karpenko M, Bhatt S, Bedrossian N, Fleming A, Ross IM, 'Flight implementation of pseudospectral optimal control for the TRACE space telescope', AIAA Guidance, Navigation, and Control Conference 2011 (2011)

This paper presents the application of pseudospectral optimal control techniques for solving time-optimal reorientation maneuvers and their implementation on the NASA space telesc... [more]

This paper presents the application of pseudospectral optimal control techniques for solving time-optimal reorientation maneuvers and their implementation on the NASA space telescope TRACE. A time-optimal reorientation maneuver is designed by first deriving a constrained optimal control problem formulation from models of the TRACE spacecraft dynamics and reaction wheel-based attitude control system. A detailed flight simulation model of the TRACE spacecraft is constructed to assist in this process. The resulting optimal control problem is then solved using fast spectral algorithms. Both simulation results and telemetry data obtained from a flight experiment show that the designed timeoptimal maneuver adheres to the specified constraints, including the nonlinear reaction wheel torque-momentum envelope and other limitations imposed by on board sensors. Moreover, the time-optimal maneuver was implemented on orbit without the need to modify the existing spacecraft attitude control system, making the approach suitable for application to other spacecraft already on orbit. © 2011 by M. Karpenko, S. Bhatt, N. Bedrossian, A. Fleming, I.M. Ross. Published by the American Institute of Aeronautics and Astronautics, Inc.

Citations Scopus - 6
2010 Eielsen AA, Fleming AJ, 'Passive shunt damping of a piezoelectric stack nanopositioner', 2010 American Control Conference, ACC 2010 (2010) [E1]
Citations Scopus - 16Web of Science - 11
Co-authors Arnfinnaas Eielsen
2010 Fleming AJ, 'High speed nanopositioning with force feedback', 2010 American Control Conference, ACC 2010 (2010) [E1]
Citations Scopus - 1
2010 Fleming AJ, Kenton BJ, Leang KK, 'Ultra-fast dual-stage vertical positioning for high performance SPMs', 2010 American Control Conference, ACC 2010 (2010) [E1]
Citations Scopus - 4Web of Science - 4
2010 Kuiper S, Fleming AJ, Schitter G, 'Dual actuation for high speed atomic force microscopy', 5th IFAC Symposium on Mechatronic Systems (2010) [E1]
Citations Scopus - 11
2010 Fleming AJ, Leang KK, 'High performance nanopositioning with integrated strain and force feedback', 5th IFAC Symposium on Mechatronic Systems (2010) [E1]
2010 Fleming A, Sekhavat P, Ross IM, 'Constrained, minimum-time maneuvers for CMG actuated spacecraft', Advances in the Astronautical Sciences (2010)

We address the time-optimal reorientation of a spacecraft with control moment gyros (CMGs) as the torque generating devices. The rigid-body solutions are inapplicable for a CMG-dr... [more]

We address the time-optimal reorientation of a spacecraft with control moment gyros (CMGs) as the torque generating devices. The rigid-body solutions are inapplicable for a CMG-driven spacecraft due to the strong coupling between the actuator dynamics and the rigid-body equations. No assumptions are made with regards to the eigenaxis being the optimal axis for slewing. In sharp contrast to the rigid-body system, singular arcs occur quite naturally in the CMG-driven system. Solutions are computed using recent results from optimal control theory and pseudospectral methods. Our computed solutions are practically implementable in that we incorporate limits on the gimbal accelerations. The state space of the resulting optimal control problem is in R15. Necessary conditions for this optimal control problem are derived and the extremality of the computed solution is demonstrated by way of Pontryagin's Principle. A key discovery of our analysis is the strong connection between CMG sizing and jerk limits.

Citations Scopus - 4
2010 Fleming AJ, Thomas SK, Yerkes KL, 'Titanium-water loop heat pipe operating characteristics under standard and elevated acceleration fields', 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition (2010)

An experiment has been developed to examine the behavior of a titanium-water loop heat pipe (LHP) under standard and elevated acceleration fields. The LHP was mounted on a 2.44 m ... [more]

An experiment has been developed to examine the behavior of a titanium-water loop heat pipe (LHP) under standard and elevated acceleration fields. The LHP was mounted on a 2.44 m diameter centrifuge table on edge with heat applied to the evaporator via a mica heater and heat rejected using a high-temperature polyalphaolefin oil (PAO) coolant loop. The LHP was tested under the following parametric ranges: heat load at the evaporator, 100 = Qin = 600 W; heat load at the compensation chamber, 0 = Q cc = 50 W; radial acceleration, 0 = ar = 10 g. For stationary operation, the evaporative heat transfer coefficient decreased monotonically with heat load while the thermal resistance decreased to a minimum then increased. Heat input to the compensation chamber was found to increase the evaporative heat transfer coefficient and decrease the thermal resistance for Qin = 500 W. Transient periodic flow reversal in the LHP was found for some cases, which was likely due to vapor bubble formation in the primary wick. Operation in an elevated acceleration environment revealed that dry-out was dependent on both Qin and ar, and the ability for the LHP to reprime after an acceleration event that induced dry-out was influenced by the evaporator temperature. The evaporative heat transfer coefficient and thermal resistance were found not to be significantly dependent on radial acceleration. However, the evaporator wall superheat was found to increase slightly with radial acceleration at high heat loads.

2010 Fleming AJ, 'The AFRL/RZPS centrifuge table test facility', U.S. Air Force T and E Days 2010 (2010)

The Centrifuge Table Test Facility in the Propulsion Directorate of the Air Force Research Laboratory at Wright-Patterson Air Force Base has a long history of providing critical k... [more]

The Centrifuge Table Test Facility in the Propulsion Directorate of the Air Force Research Laboratory at Wright-Patterson Air Force Base has a long history of providing critical knowledge of the response of two-phase heat transfer systems to changing accelerations in aerospace applications. This paper will discuss the centrifuge table facility, a review of literature produced using the facility, the importance of two-phase fluid systems subjected to varying accelerations, and the capabilities and limitations of the centrifuge table. The test bed consists of a 2.44 m diameter horizontal rotating table driven by a 20 hp DC electric motor. The test bed can deliver the following to devices mounted to the rotating table: Conditioned DC electrical power through three separate power supplies, 120 VAC power, temperature-controlled ethylene glycol coolant, and electrical signals for analog or digital control. In addition, electrical signals are collected from instruments on the table and stored in a data acquisition computer. The table is capable of radial acceleration up to a r = 12 g, with a maximum onset of ¿r = 10 g/s, inducing a tangential acceleration. The table rotation can be varied manually using a potentiometer, or controlled digitally using a signal generator in the data acquisition and control system. The acceleration field is measured using an orthogonal triaxial accelerometer.

Citations Scopus - 1
2010 Fleming A, Sekhavat P, Ross IM, 'Minimum-time reorientation of a rigid body', Journal of Guidance, Control, and Dynamics (2010)

Recent advances in optimal control theory and computation are used to develop minimum-time solutions for the rest-to-rest reorientation of a generic rigid body. It is shown that t... [more]

Recent advances in optimal control theory and computation are used to develop minimum-time solutions for the rest-to-rest reorientation of a generic rigid body. It is shown that the differences in the geometry of the inertia ellipsoid and the control space lead to counterintuitive noneigenaxis maneuvers. The optimality of the open-loop solutions are verified by an application of Pontryagin's principle as a necessary condition and not as a problem-solving tool. It is shown that the nonsmoothness of the lower Hamiltonian compounds the curse of dimensionality associated in solving the Hamilton-Jacobi-Bellman equations for feedback solutions. These difficulties are circumvented by generating Carathéodory-jr trajectories, which are based on the fundamental notion that a closed loop does not necessarily imply closed-form solutions. While demonstrating the successful implementation of the proposed method for practical applications, these closed-loop results reveal yet another counterintuitive phenomenon: a suggestion that parameter uncertainties may aid the optimality of the maneuver rather than hinder it. Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc.

DOI 10.2514/1.43549
Citations Scopus - 25
2009 Fleming AJ, 'High-speed vertical positioning for contact-mode atomic force microscopy', 2009 IEEE/ASME International Conference on Advanced Intelligent Mechatronics. Proceedings (2009) [E1]
DOI 10.1109/AIM.2009.5229959
Citations Scopus - 11Web of Science - 6
2009 Fleming AJ, Aphale SS, Moheimani SO, 'A new robust damping and tracking controller for SPM positioning stages', Proceedings of the American Control Conference (2009) [E1]
DOI 10.1109/acc.2009.5159934
Citations Scopus - 7Web of Science - 3
Co-authors Reza Moheimani
2009 Fleming AJ, 'Time-domain adaptive feed-forward control of nanopositioning systems with periodic inputs', Proceedings of the American Control Conference (2009) [E1]
DOI 10.1109/acc.2009.5160708
Citations Scopus - 1Web of Science - 1
2009 Fleming A, Sekhavat P, Ross IM, 'On the minimum-time reorientation of a rigid body', AIAA Guidance, Navigation, and Control Conference and Exhibit (2009)

Recent advances in optimal control theory and computation are used to develop minimumtime solutions for the rest-to-rest reorientation of a generic rigid-body. It is shown that th... [more]

Recent advances in optimal control theory and computation are used to develop minimumtime solutions for the rest-to-rest reorientation of a generic rigid-body. It is shown that the differences in the geometry of the inertia ellipsoid and the control space lead to counterintuitive non-eigenaxis maneuvers. The optimality of the open-loop solutions are verified by an application of Pontryagin's Principle as a necessary condition and not as a problemsolving tool. It is shown that the nonsmoothness of the lower Hamiltonian compounds the curse of dimensionality associated in solving the Hamilton-Jacobi-Bellman equations for feedback solutions. These difficulties are circumvented by generating arathéodory-p trajectories which are based on the fundamental notion that closed-loop does not necessarily imply closed-form solutions. While demonstrating the successful implementation of the proposed method for practical applications, these closed-loop results reveal yet another counter-intuitive phenomenon: a suggestion that parameter uncertainties may aid the optimality of the maneuver rather than hinder it. Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc.

Citations Scopus - 3
2008 Aphale SS, Fleming AJ, Moheimani SO, 'A second-order controller for resonance damping and tracking control of nanopositioning systems', Proceedings ICAST 2008: 19th International Conference on Adaptive Structures and Technologies (2008) [E2]
Co-authors Reza Moheimani
2008 Fleming AJ, 'Techniques and considerations for driving piezoelectric actuators at high-speed', Proceedings of SPIE: The International Society for Optical Engineering (2008) [E2]
DOI 10.1117/12.778121
Citations Scopus - 7Web of Science - 1
2008 Fleming AJ, Wills AG, 'Optimal input signals for bandlimited scanning systems', Proceedings of the 17th World Congress of the International Federation of Automatic Control (2008) [E1]
DOI 10.3182/20080706-5-kr-1001.1892
Citations Scopus - 7
2008 Aphale SS, Fleming AJ, Moheimani SOR, 'A second-order controller for resonance damping and tracking control of nanopositioning systems', 19th International Conference on Adaptive Structures and Technologies 2008, ICAST 2008 (2008)

This paper presents a simple second-order controller that damps the resonance typical of piezoelectric nanopositioners and delivers good tracking performance. This method employs ... [more]

This paper presents a simple second-order controller that damps the resonance typical of piezoelectric nanopositioners and delivers good tracking performance. This method employs the Integral Resonant Control scheme (IRC) for damping the dominant resonant mode of the piezoelectric nanopositioner and uses an integral controller to achieve tracking performance. As disturbance rejection is a main concern in nanopositioning applications, the control scheme is tested for its disturbance rejection performance. It is seen that the control scheme has good disturbance rejection characteristics deeming it suitable for nanopositioning applications. To test the tracking performance, the system is made to track a 20 Hz triangular input at various integral gains. It is shown that improved tracking performance can be achieved at high gains with only a slight degradation in disturbance rejection performance at high frequencies.

Citations Scopus - 7
Co-authors Reza Moheimani
2008 Leang KK, Fleming AJ, 'High-speed serial-kinematic AFM scanner: Design and drive considerations', Proceedings of the American Control Conference 2008 (2008) [E1]
DOI 10.1109/acc.2008.4586983
Citations Scopus - 21Web of Science - 15
2008 Fleming A, Ross IM, 'Minimum-time maneuvering of CMG-driven spacecraft', Advances in the Astronautical Sciences (2008)

Since the inception of optimal control theory, minimum-time solutions have been sought for various problems as they provide the foundations for understanding the dynamics of the c... [more]

Since the inception of optimal control theory, minimum-time solutions have been sought for various problems as they provide the foundations for understanding the dynamics of the control system. In space applications, rapid maneuvering capabilities are inherently vital to both civilian and military needs. In this paper, we address the time-optimal reorientation of a spacecraft with control moment gyros (CMGs) as the torque generating devices. No assumptions are made with regards to the eigenaxis being the optimal axis for slewing. In addition to its attitude and attitude rates, the state-space of a CMG-driven spacecraft includes the gimbal positions. Taking gimbal rates as the control variables, the coupled non-Eulerian dynamics are fully exploited to formulate and solve the true minimum-time attitude maneuvering problem. Solutions are obtained using recent results from optimal control theory and pseudospectral methods. In sharp contrast to the rigid-body system, singular arcs occur quite naturally in the CMG-driven system. The extremality of the solution is demonstrated by way of Pontryagin's Principle.

Citations Scopus - 4
2008 Fleming A, Sekhavat P, Ross IM, 'Minimum-time reorientation of an asymmetric rigid body', AIAA Guidance, Navigation and Control Conference and Exhibit (2008)

Minimum-time solutions are developed for the rest-to-rest reorientation of an asymmetric rigid-body. The optimality of the open-loop solutions are demonstrated by application of P... [more]

Minimum-time solutions are developed for the rest-to-rest reorientation of an asymmetric rigid-body. The optimality of the open-loop solutions are demonstrated by application of Pontryagin's Minimum Principle. Bellman's theory is used to further demonstrate optimality while extending open-loop theory to real-time application. The open-loop time optimal control is, next, used to construct the closed-loop Carathéodory-p control solution for a similar maneuver. Closed-loop results presented for the system with and without parameter uncertainties verify the successful implementation of the method in practical applications. © 2008 by A. Fleming, P. Sekhavat, I.M. Ross.

Citations Scopus - 8
2008 Fleming A, Ross IM, 'Optimal control of spinning axisymmetric spacecraft: A pseudospectral approach', AIAA Guidance, Navigation and Control Conference and Exhibit (2008)

Shen and Tsiotras considered the case where the axisymmetric rigid body was subject to only two control torques which spanned the plane perpendicular to the axis of symmetry. They... [more]

Shen and Tsiotras considered the case where the axisymmetric rigid body was subject to only two control torques which spanned the plane perpendicular to the axis of symmetry. They used a cascaded computational scheme which involved both direct and indirect methods of optimization. Additionally, their method required initial costate guesses which further complicated numerical results. They concluded that two torques were sufficient to achieve a time-optimal maneuver. In this work the Legendre Pseudospectral method will be used to solve the two-torque problem with only a two-point guess to demonstrate the method's superiority. Additionally, it will be demonstrated that while reorientation of the spin axis is possible with two control torques spanning the plane perpendicular to the spin axis, the addition of a third control torque about the axis of symmetry further reduces the objective function. It will be shown that this new solution has significantly different characteristics form the previously published work. © 2008 by Andrew Fleming.

Citations Scopus - 11
2008 Homitz J, Scaringe RP, Cole GS, Fleming A, Michalak T, 'Comparative analysis of thermal management architectures to address evolving thermal requirements of aircraft systems', SAE Technical Papers (2008)

Recent advances in aircraft technology have raised much concern over the manner in which aircraft thermal management is carried out. These advances range from the incorporation of... [more]

Recent advances in aircraft technology have raised much concern over the manner in which aircraft thermal management is carried out. These advances range from the incorporation of high-power electronics to transporting thermal loads at high temperatures. These types of technological advances have brought about a necessity for new aircraft thermal management architectures in order to maintain reasonable cost, size, weight, and power requirements of the overall system. The objective of this study is to address the requirements and performance aspects of existing system configurations in an effort to identify inefficiencies and highlight potential areas for improvement. As a result of this study, a new aircraft thermal management architecture, which can best be described as a vapor-compression thermal bus, is proposed as a replacement for existing technology. This paper will present the findings of a thermodynamic analysis that compares the requirements and performance aspects of existing architectures to those of the vapor-compression thermal bus. Copyright © 2008 SAE International.

DOI 10.4271/2008-01-2905
Citations Scopus - 2
2008 Fleming AJ, Leang KK, 'Evaluation of charge drives for scanning probe microscope positioning stages', Proceedings of the American Control Conference 2008 (2008) [E1]
DOI 10.1109/acc.2008.4586791
Citations Scopus - 15Web of Science - 12
2008 Maess J, Fleming AJ, Allgower F, 'Model-based vibration suppression in piezoelectric tube scanners through induced voltage feedback', Proceedings of the American Control Conference 2008 (2008) [E1]
DOI 10.1109/acc.2008.4586790
Citations Scopus - 4Web of Science - 4
2007 Aphale SS, Moheimani SO, Fleming AJ, 'Dominant resonant mode damping of a piezoelectric tube nanopositioner using optimal sensorless shunts', American Control Conference, 2007. ACC '07. proceedings (2007) [E1]
DOI 10.1109/acc.2007.4283080
Co-authors Reza Moheimani
2007 Aphale SS, Fleming AJ, Moheimani SOR, 'Integral resonant control of collocated smart structures', SMART MATERIALS AND STRUCTURES (2007) [E4]
DOI 10.1088/0964-1726/16/2/023
Citations Scopus - 1Web of Science - 106
Co-authors Reza Moheimani
2007 Clayton GM, Tien S, Fleming AJ, Moheimani SO, Devasia S, 'Hysteresis and Vibration Compensation in Piezoelectric Actuators by Integrating Charge Control and Inverse Feedforward', Preprints of the 4th IFAC-Symposium on Mechatronic Systems (2007) [E1]
Citations Scopus - 4
Co-authors Reza Moheimani
2007 Aphale SS, Fleming AJ, Moheimani SO, 'Integral control of smart structures with collocated sensors and actuators', Proceedings of the European Control Conference 2007 (2007) [E1]
Citations Scopus - 1
Co-authors Reza Moheimani
2007 Maess J, Fleming AJ, Allgoewer F, 'Simulation of piezoelectric tube actuators by reduced finite element models for controller design', 2007 AMERICAN CONTROL CONFERENCE, VOLS 1-13 (2007)
2007 Maess J, Fleming AJ, Allgower F, 'Simulation of piezolectric tube actuators by reduced finite element models for controller design', Proceedings of the 2007 American Control Conference (2007) [E1]
Citations Scopus - 4
2007 Fleming AJ, Wills AG, Moheimani SO, 'Sensor fusion for improved control of piezoelectric tube scanners', 2007 IEEE/ASME International Conference on Advanced Intelligent Mechatronics. Proceedings (2007) [E1]
Citations Scopus - 3
Co-authors Reza Moheimani
2007 Aphale SS, Moheimani SOR, Fleming AJ, 'Dominant resonant mode damping of a piezoelectric tube nanopositioner using optimal sensorless shunts', 2007 AMERICAN CONTROL CONFERENCE, VOLS 1-13 (2007) [E1]
Citations Scopus - 3
Co-authors Reza Moheimani
2007 Bhikkaji B, Ratnam MR, Fleming AJ, Moheimani SO, 'High-Performance Control of a PZT Scanner', Preprints of the 4th IFAC-Symposium on Mechatronic Systems (2007) [E1]
Citations Scopus - 1
Co-authors Reza Moheimani
2007 Aphale SS, Moheimani SO, Fleming AJ, 'Optimal Sensorless Shunts for Vibration Damping of a Piezoelectric Tube Nanopositioner', Proceedings of the 17th International Conference on Adaptive Structures and Technologies (2007) [E2]
Co-authors Reza Moheimani
2006 Fleming AJ, Moheimani SO, 'Proof-Mass Inertial Vibration Control Using a Shunted Electromagnetic Transducer', Proceedings of 16th IFAC World Congress (2006) [E1]
Co-authors Reza Moheimani
2006 Fleming AJ, Niederberger D, Moheimani SO, Morari M, 'Mitigation of acoustic resonance using electrically shunted loudspeakers', Proceedings of the Society of Photo-Optical Instrumentation Engineers: Smart Structures and Materials 2006: Damping and Isolation (2006) [E2]
Co-authors Reza Moheimani
2006 Fleming A, Ross IM, 'Singularity-free optimal steering of control moment gyros', Advances in the Astronautical Sciences (2006)

Research on the attitude control of spacecraft using control moment gyros (CMGs) has been largely dominated by singularity avoidance. In this paper, we show that the singularity p... [more]

Research on the attitude control of spacecraft using control moment gyros (CMGs) has been largely dominated by singularity avoidance. In this paper, we show that the singularity problem disappears if the control is properly identified in terms of the actuator inputs rather than the torques on the spacecraft body. Under this formulation, the spacecraft can now be properly steered. Although any optimality criterion may be used for steering, we choose time-optimality as it a fundamental problem in both control theory and spacecraft attitude maneuvering. Results for a small spacecraft based on the parameters of NPSAT1 demonstrate the details of our approach.

Citations Scopus - 17
2006 Ross IM, Sekhavat P, Fleming A, Gong Q, 'Pseudospectral feedback control: Foundations, examples and experimental results', Collection of Technical Papers - AIAA Guidance, Navigation, and Control Conference 2006 (2006)

Suppose optimal open-loop controls could be computed in real time. This implies optimal feedback control. These controls are, typically, nonsmooth, Nonsmooth controls raise fundam... [more]

Suppose optimal open-loop controls could be computed in real time. This implies optimal feedback control. These controls are, typically, nonsmooth, Nonsmooth controls raise fundamental theoretical problems on the existence and uniqueness of feedback solutions. A simple, yet powerful, approach to address these theoretical issues is the concept of a p-solution that is closely linked to the practical implementation of zero-order-hold control sampling. In other words, even traditional feedback controls involve open-loop controls through the process of sampling. In this paper, we advance the notion of Carathéodory-p solutions that use the sampling intervals to compute optimal open-loop controls. A sampling theorem is developed which indicates that the Lipschitz constant of the dynamics is a fundamental sampling frequency. This places computation at the level of first principles in describing the foundations for achieving feedback. We obtain these controls by way of pseudospectral (PS) methods as these techniques can generate optimal open-loop controls within fractions of a second even when implemented in a MATLAB© environment running on legacy computer hardware. In order to facilitate an exposition of the proposed ideas to a wide audience, we introduce the core principles only while relegating the Intricate details to numerous recent references. These principles are then applied to generate PS feedback controls for the slew maneuvering of NFSAT1, a spacecraft conceived, designed and built at the Naval Postgraduate School and scheduled to be launched in Fall 2007.

Citations Scopus - 16
2006 Fleming AJ, Leland QH, Yerkes KL, Elston LJ, Thomas SK, 'Aircraft thermal management using loop heat pipes: Experimental simulation of high acceleration environments using the centrifuge table test bed', SAE Technical Papers (2006)

The objective of this paper is to describe the design of an experiment that will examine the effects of elevated acceleration environments on a high-temperature, titanium-water lo... [more]

The objective of this paper is to describe the design of an experiment that will examine the effects of elevated acceleration environments on a high-temperature, titanium-water loop heat pipe for actuator cooling. An experimental test setup has been designed for mounting a loop heat pipe on an 8-ft-diameter centrifuge table, which is capable of radial accelerations of up to 12-g's. A high-temperature PAO loop will interface the condenser of the loop heat pipe to simulate the rejection of the transported heat to an elevated temperature. In addition to LHP experimentation, a mathematical model has been developed for aerodynamic heating of highspeed aircraft. A flat plate at zero-incidence, used to model an aircraft wing, was subjected to sub- and supersonic flow to examine whether heat will be rejected or absorbed. The results of this analysis will be used to determine the condenser conditions of the loop heat pipe during centrifuge testing. Copyright © 2006 SAE International.

DOI 10.4271/2006-01-3066
Citations Scopus - 2
2006 Elston LJ, Yerkes KL, Fleming AJ, Thomas SK, 'Centrifuge testing of a partially-confined FC-72 spray', SAE Technical Papers (2006)

The effects of elevated acceleration fields on spray cooling heat transfer are discussed in this paper. Spray cooling has proven to be one of the most efficient methods of heat re... [more]

The effects of elevated acceleration fields on spray cooling heat transfer are discussed in this paper. Spray cooling has proven to be one of the most efficient methods of heat removal. This technology is being transitioned into more advanced applications, such as fighter aircraft that must withstand a wide range of variable acceleration-induced body forces. Heat transfer associated with closed-loop spray cooling will be affected by acceleration body forces, the extent of which is not yet known. To test these various effects, an eight-foot-diameter centrifuge table will be outfitted with a spray cooling system to test for the effects associated with elevated gravity. Copyright © 2006 SAE International.

DOI 10.4271/2006-01-3065
Citations Scopus - 1
2005 Wills AG, Bates DR, Fleming AJ, Ninness BM, Moheimani SO, 'Application of MPC to an Active Structure Using Sampling Rates up To 25kHz', Proceedings of the 44th IEEE Conference On Decision And Control (2005) [E1]
Citations Scopus - 20Web of Science - 4
Co-authors Brett Ninness, Reza Moheimani
2005 Fleming AJ, Moheimani SO, 'Senor-less Vibration Suppression and Scan Compensation for Piezoelectric Tube Nanopositioners (invited paper)', Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference 2005 (2005) [E1]
Co-authors Reza Moheimani
2005 Ratnam M, Bhikkaji B, Fleming AJ, Moheimani SO, 'PPF Control of a Piezoelectric Tube Scanner (invited paper)', Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference 2005 (2005) [E1]
Citations Scopus - 31Web of Science - 14
Co-authors Reza Moheimani
2005 Yan H, Fleming A, Ross IM, Alfriend KT, 'Real-time computation of time-optimal magnetic attitude control', Advances in the Astronautical Sciences (2005)

Magnetic actuators have been used for momentum dumping and attitude control in many spacecraft. Of late, magnetic actuators have also been proposed as a sole means for attitude co... [more]

Magnetic actuators have been used for momentum dumping and attitude control in many spacecraft. Of late, magnetic actuators have also been proposed as a sole means for attitude control, particularly for small inexpensive spacecraft. In this paper, we investigate the use of magnetic actuators for the time-optimal slew maneuver using a spectral algorithm implemented in the reusable software package, DIDO. The parameters of the example problem correspond to that of NPSATI, a small satellite being built at the Naval Postgraduate School, and due to launch in January 2006. Numerical experiments reveal that real-time optimal solutions can be easily obtained.

Citations Scopus - 6
2005 Sekhavat P, Fleming A, Ross IM, 'Time-optimal nonlinear feedback control for the NPSAT1 spacecraft', IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM (2005)

NPSAT1 is a small satellite being built at the Naval Postgraduate School, and due to launch in January 2006. It uses magnetic actuators and a pitch momentum wheel for attitude con... [more]

NPSAT1 is a small satellite being built at the Naval Postgraduate School, and due to launch in January 2006. It uses magnetic actuators and a pitch momentum wheel for attitude control. In this paper, a novel time-optimal sampled-data feedback control algorithm is introduced for closed-loop control of NPSAT1 in the presence of disturbances. The feedback law is not analytically explicit; rather, it is obtained by a rapid re-computation of the open-loop time-optimal control at each update instant. The implementation of the proposed controller is based on a shrinking horizon approach and does not require any advance knowledge of the computation time. Preground-test simulations show that the proposed control scheme performs well in the presence of parameter uncertainties and external disturbance torques. © 2005 IEEE.

Citations Scopus - 38
2004 Fleming AJ, Moheimani SO, 'Hybrid DC accurate charge amplifier for linear piezoelectric positioning', Mechatronic Systems 2004, A Proceedings Volume from the 3rd IFAC Symposium (2004) [E1]
Co-authors Reza Moheimani
2004 Niederberger D, Fleming AJ, Moheimani SO, Morari M, 'Online-tuned multi-mode resonant piezoelectric shunt for broadband vibration suppression', Mechatronic Systems 2004, A Proceedings Volume from the 3rd IFAC Symposium (2004) [E1]
Co-authors Reza Moheimani
2004 Behrens S, Fleming AJ, Moheimani SO, 'Negative inductor-resistor controller for electromagnetic shunt damping', Mechatronic Systems 2004, A Proceedings Volume from the 3rd IFAC Symposium (2004) [E1]
Co-authors Reza Moheimani
2004 Behrens S, Fleming AJ, Moheimani SO, 'Control orientated synthesis of electromagnetic shunt impedances for vibration isolation', CD ROM (2004) [E1]
Co-authors Reza Moheimani
2004 Behrens S, Fleming AJ, Moheimani SO, 'Vibration isolation using a shunted electromagnetic transducer', Conference Paper (2004) [E2]
Citations Scopus - 4Web of Science - 4
Co-authors Reza Moheimani
2004 Fleming AJ, Moheimani SO, 'Synthesis of optimal piezoelectric shunt impedances for structural vibration control', Conference Paper (2004) [E2]
Citations Scopus - 2Web of Science - 1
Co-authors Reza Moheimani
2003 Behrens S, Fleming AJ, Moheimani SOR, 'Electromagnetic shunt damping', PROCEEDINGS OF THE 2003 IEEE/ASME INTERNATIONAL CONFERENCE ON ADVANCED INTELLIGENT MECHATRONICS (AIM 2003), VOLS 1 AND 2 (2003)
Citations Scopus - 22Web of Science - 16
Co-authors Reza Moheimani
2003 Fleming AJ, Behrens S, Moheimani SO, 'Active LQR and H2 shunt control of electromagnetic transducers', Proceedings for CDC 2003 (CD ROM) (2003) [E1]
Citations Scopus - 12Web of Science - 3
Co-authors Reza Moheimani
2003 Behrens S, Fleming AJ, Moheimani SO, 'Electrodynamic Vibration Suppression', Proceedings of SPIE (2003) [E2]
Citations Scopus - 8Web of Science - 6
Co-authors Reza Moheimani
2003 Fleming AJ, Moheimani SO, 'Improved current and charge amplifiers for driving piezoelectric loads', Proceedings of SPIE (2003) [E2]
Citations Scopus - 2Web of Science - 1
Co-authors Reza Moheimani
2003 Behrens S, Fleming AJ, Moheimani SO, 'Robust passive Piezoelectric Shunt Dampener', Proceedings of SPIE (2003) [E2]
Co-authors Reza Moheimani
2003 Fleming AJ, Behrens S, Moheimani SO, 'An Autonomous Piezoelectric Shunt Damping System', Proceedings of SPIE (2003) [E2]
Citations Scopus - 8Web of Science - 2
Co-authors Reza Moheimani
2002 Moheimani SO, Behrens S, Fleming AJ, 'Dynamics and Stability of Wideband Vibration Absorbers with Multiple Piezoelectric Transducers', 15th Triennial World Congress (2002) [E1]
Co-authors Reza Moheimani
2002 Behrens S, Moheimani SO, Fleming AJ, 'Multiple Mode Passive Piezoelectric Shunt Dampener', Mechatronic Systems (2002) [E1]
Co-authors Reza Moheimani
2002 Fleming AJ, Moheimani SO, 'The Effect of Artificially Reducing the Size of Inductors in Piezoelectric Shunt Damping Circuits', Mechatronic Systems (2002) [E1]
Co-authors Reza Moheimani
2002 Fleming AJ, Moheimani SO, 'Power Harvesting Piezoelectric Shunt Damping', Mechatronic Systems (2002) [E1]
Co-authors Reza Moheimani
2002 Behrens S, Fleming AJ, Moheimani SO, 'Series-Parallel Impedance Structure for Piezoelectric Vibration Damping', Proceedings of SPIE - Smart Materials II (2002) [E1]
Citations Scopus - 4Web of Science - 2
Co-authors Reza Moheimani
2002 Fleming AJ, Moheimani SO, 'Adaptive Piezoelectric Shunt Damping', Smart Structures and Materials 2002: Damping and Isolation (2002) [E1]
Citations Scopus - 67Web of Science - 7
Co-authors Reza Moheimani
2002 Moheimani SO, Fleming AJ, Behrens S, 'On the Feedback Structure of Wideband Piezoelectric Shunt Damping Systems', 15th Triennial World Congress (2002) [E1]
Citations Scopus - 1
Co-authors Reza Moheimani
2000 McKelvey T, Fleming AJ, Moheimani SO, 'Subspace based system identification for an acoustic enclosure', Proceedings of IEEE International Conference on Control Applications & IEEE International Symposium on Computer-Aided Control Systems Design (2000) [E1]
Citations Scopus - 36Web of Science - 22
Co-authors Reza Moheimani
2000 Fleming AJ, Behrens S, Moheimani SO, 'A New Approach to Piezoelectric Shunt Damping', Proceedings of IS3M 2000 Symposium (2000) [E1]
Co-authors Reza Moheimani
Show 104 more conferences

Other (5 outputs)

Year Citation Altmetrics Link
2013 Rios SA, Fleming AJ, 'Systems and Methods for Driving Piezoelectric Benders', (2013)
2012 Fleming AJ, 'Charge Drive with Active DC Stabilization', (2012)
2010 Fleming AJ, 'A Positioning System and Method', (2010)
2002 Fleming AJ, Behrens S, Moheimani SOR, 'Power harvesting from piezoelectric transducers', (2002)
2001 Fleming AJ, Behrens S, Moheimani SOR, 'An impedance synthesizing arrangement, an improved vibrational damping apparatus and a method for deriving a digital signal processing algorithm', (2001)
Show 2 more others

Thesis / Dissertation (1 outputs)

Year Citation Altmetrics Link
2004 Fleming AJ, Synthesis and implementation of sensor-less shunt controllers for piezoelectric and electromagnetic vibration control, (2004)
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Grants and Funding

Summary

Number of grants 31
Total funding $10,784,125

Click on a grant title below to expand the full details for that specific grant.


20171 grants / $43,388

UON 2017 Researcher Equipment Grant $43,388

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Andrew Fleming
Scheme Researcher Equipment Grants
Role Lead
Funding Start 2017
Funding Finish 2017
GNo G1701156
Type Of Funding Internal
Category INTE
UON Y

20163 grants / $379,000

Facility for Nanometer Scale Microscopy, Characterization, and Fabrication$194,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Andrew Fleming, Conjoint Professor Rob Atkin, Professor Erica Wanless, Dr Stuart Prescott, Professor Robert Melchers, Doctor John Holdsworth, Patrick Cullen, Associate Professor Patrick Spicer
Scheme Equipment Grant
Role Lead
Funding Start 2016
Funding Finish 2016
GNo G1500390
Type Of Funding Internal
Category INTE
UON Y

Facility for Nanometer Scale Microscopy, Characterization, and Fabrication$155,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Doctor Andrew Fleming, Conjoint Professor Rob Atkin, Doctor John Holdsworth, Professor Robert Melchers, Professor Erica Wanless, Patrick Cullen, Dr Stuart Prescott, Associate Professor Patrick Spicer
Scheme Linkage Infrastructure Equipment & Facilities (LIEF)
Role Lead
Funding Start 2016
Funding Finish 2016
GNo G1500603
Type Of Funding Scheme excluded from IGS
Category EXCL
UON Y

Facility for Nanometer Scale Microscopy, Characterization, and Fabrication$30,000

Funding body: University of New South Wales

Funding body University of New South Wales
Project Team Doctor Andrew Fleming, Conjoint Professor Rob Atkin, Doctor John Holdsworth, Professor Robert Melchers, Professor Erica Wanless, Patrick Cullen, Dr Stuart Prescott, Associate Professor Patrick Spicer
Scheme Linkage Infrastructure Equipment & Facilities (LIEF) Partner Funding
Role Lead
Funding Start 2016
Funding Finish 2016
GNo G1600873
Type Of Funding Scheme excluded from IGS
Category EXCL
UON Y

20153 grants / $300,518

Atomic Resolution Sensors for Imaging and Metrological Science$275,518

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Doctor Andrew Fleming
Scheme Discovery Projects
Role Lead
Funding Start 2015
Funding Finish 2017
GNo G1400362
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

VESPA$15,000

Funding body: Calvary Mater Newcastle

Funding body Calvary Mater Newcastle
Project Team Conjoint Professor Peter Greer, Doctor John Holdsworth, Doctor Andrew Fleming, Dr Joerg Lehmann, Miss Narges Miri
Scheme Project Grant
Role Investigator
Funding Start 2015
Funding Finish 2015
GNo G1500770
Type Of Funding Contract - Aust Non Government
Category 3AFC
UON Y

VESPA project$10,000

Funding body: TROG (Trans Tasman Radiation Oncology Group)

Funding body TROG (Trans Tasman Radiation Oncology Group)
Project Team Conjoint Professor Peter Greer, Doctor John Holdsworth, Doctor Andrew Fleming, Dr Joerg Lehmann
Scheme Research Grant
Role Investigator
Funding Start 2015
Funding Finish 2015
GNo G1401525
Type Of Funding Grant - Aust Non Government
Category 3AFG
UON Y

20142 grants / $68,919

DVC(R) Research Support for Future Fellow (FT13)$58,979

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Andrew Fleming
Scheme Future Fellowship Support
Role Lead
Funding Start 2014
Funding Finish 2017
GNo G1301413
Type Of Funding Internal
Category INTE
UON Y

2014 International Visitor from Norwegian University of Science and Technology, Norway$9,940

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Andrew Fleming, Doctor Arnfinn Aas Eielsen
Scheme International Research Visiting Fellowship
Role Lead
Funding Start 2014
Funding Finish 2014
GNo G1400875
Type Of Funding Internal
Category INTE
UON Y

20133 grants / $941,320

Integrated Piezoelectric Microsystems for Actuation and Sensing$784,820

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Doctor Andrew Fleming
Scheme Future Fellowships
Role Lead
Funding Start 2013
Funding Finish 2017
GNo G1300028
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Nano-Optical Microscopy, Characterization and Fabrication Facility$155,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Andrew Fleming, Doctor John Holdsworth, Associate Professor Grant Webber, Professor Erich Kisi, Professor Dirk Van Helden
Scheme Equipment Grant
Role Lead
Funding Start 2013
Funding Finish 2013
GNo G1200167
Type Of Funding Internal
Category INTE
UON Y

American Control Conference, Washington DC, USA, 17 - 19 June 2013$1,500

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Andrew Fleming
Scheme Travel Grant
Role Lead
Funding Start 2013
Funding Finish 2013
GNo G1300882
Type Of Funding Internal
Category INTE
UON Y

20123 grants / $356,500

Probe based nano-fabrication of micro-electronic and mechanical systems$340,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Doctor Andrew Fleming, Professor John O'Connor
Scheme Discovery Projects
Role Lead
Funding Start 2012
Funding Finish 2014
GNo G1100209
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

A Miniature Interferometer for Sub-Nanometer Position Sensing over Long Distances$15,000

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Andrew Fleming
Scheme Pilot Grant
Role Lead
Funding Start 2012
Funding Finish 2012
GNo G1200349
Type Of Funding Internal
Category INTE
UON Y

Actuator 2012, Bremen, Germany, 18 - 20 June 2012$1,500

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Andrew Fleming
Scheme Travel Grant
Role Lead
Funding Start 2012
Funding Finish 2012
GNo G1200766
Type Of Funding Internal
Category INTE
UON Y

20112 grants / $11,500

High Speed Nanopositioning with Nanometer Resolution$10,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Andrew Fleming
Scheme Linkage Pilot Research Grant
Role Lead
Funding Start 2011
Funding Finish 2011
GNo G1100664
Type Of Funding Internal
Category INTE
UON Y

American Control Conference, San Francisco, California, 29/6/2011 - 1/7/2011$1,500

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Andrew Fleming
Scheme Travel Grant
Role Lead
Funding Start 2011
Funding Finish 2011
GNo G1100312
Type Of Funding Internal
Category INTE
UON Y

20094 grants / $1,301,500

New drives and control techniques for high performance piezoelectric actuation$580,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Doctor Andrew Fleming
Scheme Discovery Projects
Role Lead
Funding Start 2009
Funding Finish 2013
GNo G0188750
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

IEEE/ASME Advanced Intelligent Mechatronics, Singapore, 14-17 July$1,500

Funding body: University of Newcastle - Faculty of Engineering & Built Environment

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Andrew Fleming
Scheme Travel Grant
Role Lead
Funding Start 2009
Funding Finish 2009
GNo G0190429
Type Of Funding Internal
Category INTE
UON Y

20085 grants / $6,530,584

Centre for Complex Dynamic Systems and Control$5,400,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Emeritus Laureate Professor Graham Goodwin, Professor Minyue Fu, Professor Reza Moheimani, Doctor Julio Braslavsky, Dr GREG Adams, Associate Professor Jose De Dona, Doctor Maria Seron, Doctor James Welsh, Doctor Andrew Fleming, Associate Professor Tristan Perez, Doctor Damian Marelli, Associate Professor Brailey Sims, Conjoint Professor Kerrie Mengersen, Professor A Pettitt, Dr R Reeves, Professor Ian Turner, Dr Salvatore Crisafulli, Dr M Downey, Mr J Lee, Mr P Stone, Conjoint Professor John Rayner
Scheme ARC Centres of Excellence
Role Investigator
Funding Start 2008
Funding Finish 2010
GNo G0188623
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

CDSC Sub-Account: Mechatronics$785,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Emeritus Laureate Professor Graham Goodwin, Professor Reza Moheimani, Doctor Andrew Fleming
Scheme ARC Centres of Excellence
Role Investigator
Funding Start 2008
Funding Finish 2010
GNo GS090005
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

Centre for Complex Dynamic Systems and Control$323,084

Funding body: NSW Department of State and Regional Development

Funding body NSW Department of State and Regional Development
Project Team Emeritus Laureate Professor Graham Goodwin, Professor Minyue Fu, Professor Reza Moheimani, Doctor Julio Braslavsky, Dr GREG Adams, Associate Professor Jose De Dona, Doctor Maria Seron, Doctor James Welsh, Doctor Andrew Fleming, Doctor Damian Marelli, Associate Professor Brailey Sims, Conjoint Professor Kerrie Mengersen, Professor A Pettitt, Dr R Reeves, Professor Ian Turner, Dr Salvatore Crisafulli, Dr M Downey, Mr J Lee, Mr P Stone
Scheme ARC Centres of Excellence Partner Funding
Role Investigator
Funding Start 2008
Funding Finish 2010
GNo G0189187
Type Of Funding Other Public Sector - State
Category 2OPS
UON Y

Reduction of Creep, Hysteresis and Temperature Drift in Piezoelectric Actuators$20,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Andrew Fleming, Doctor Mehmet Yuce
Scheme Near Miss Grant
Role Lead
Funding Start 2008
Funding Finish 2008
GNo G0188415
Type Of Funding Internal
Category INTE
UON Y

SPIE Smart Structure and Materials 2008, San Diego, CA 9/3/2008 - 13/3/2008$2,500

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Andrew Fleming
Scheme Travel Grant
Role Lead
Funding Start 2008
Funding Finish 2008
GNo G0188556
Type Of Funding Internal
Category INTE
UON Y

20062 grants / $833,996

Nano-positioning facility for nano-scale measurement and manipulation$530,000

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Professor Reza Moheimani, Scientia Professor Ian Petersen, Emeritus Laureate Professor Graham Goodwin, Professor Rick Middleton, Professor Minyue Fu, Dr Valeri Ougrinovska, Dr Hermanshu Pota, Doctor Andrew Fleming, Dr Steven Schofield
Scheme Linkage Infrastructure Equipment & Facilities (LIEF)
Role Investigator
Funding Start 2006
Funding Finish 2006
GNo G0185548
Type Of Funding Scheme excluded from IGS
Category EXCL
UON Y

Analysis, Optimization, and Control of Scanning Atomic Force Microscope Micro-Cantilever Probes$303,996

Funding body: ARC (Australian Research Council)

Funding body ARC (Australian Research Council)
Project Team Doctor Andrew Fleming
Scheme Discovery Projects
Role Lead
Funding Start 2006
Funding Finish 2008
GNo G0185309
Type Of Funding Aust Competitive - Commonwealth
Category 1CS
UON Y

20051 grants / $2,500

The 44th Annual IEEE Conference on Decision and Control, 12-15 December 2005$2,500

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Andrew Fleming
Scheme Travel Grant
Role Lead
Funding Start 2005
Funding Finish 2005
GNo G0185867
Type Of Funding Internal
Category INTE
UON Y

20042 grants / $14,400

Scanning Tunnelling Microscope with sub-Nanometer Resolution$12,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Andrew Fleming
Scheme Early Career Researcher Grant
Role Lead
Funding Start 2004
Funding Finish 2004
GNo G0185009
Type Of Funding Internal
Category INTE
UON Y

IEEE Conference on Decision and Control, 14-17 December 2004, Bahamas$2,400

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Andrew Fleming
Scheme Travel Grant
Role Lead
Funding Start 2004
Funding Finish 2004
GNo G0184838
Type Of Funding Internal
Category INTE
UON Y
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Research Supervision

Number of supervisions

Completed0
Current8

Total current UON EFTSL

Masters0.1
PhD3.8

Current Supervision

Commenced Level of Study Research Title Program Supervisor Type
2016 PhD Control and Optimisation for Nanolithography PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Principal Supervisor
2016 PhD MEMs Devices, AFM and Nano Control PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Principal Supervisor
2015 Masters Design and Development of Nano-positioning Devices for Atomic Force Microscopy Applications M Philosophy(Elec Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2014 PhD Remote EPID-Based Dosimetry for Credentialing Radiation Therapies PhD (Physics), Faculty of Science, The University of Newcastle Co-Supervisor
2013 PhD Damping and Tracking Controllers for Nanopositioning Systems: Applications for High-Speed Scanning Probe Microscopy PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Principal Supervisor
2013 PhD Study of the Physics and Photonic Properties of Structures Created from Sub-wavelength Optical Phenomena PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Principal Supervisor
2013 PhD Miniature Ambulatory Robots Driven by Piezoelectric Bimorph Benders: Design, Drive and Control Methods PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
2011 PhD Real Time Localisation of an Endoscope Capsule using Electromagnetic Field Method (EMF) PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Principal Supervisor
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Research Projects

Miniature Monolithic Piezoelectric Robot 2013 - 2017

The project aims to design, fabricate and test a prototype miniature resonant ambulatory robot that uses piezoelectric actuators to achieve locomotion.

Grants

Bio-inspired robots: Design of a Fast Walking Insect Using Variable Compliant Structure

Funding body: Faculty of Engineering and Built Environment - The University of Newcastle (Australia)

Funding body Faculty of Engineering and Built Environment - The University of Newcastle (Australia)
Scheme FEBE Strategic Pilot Grant

Publications

Rios SA, Fleming AJ, Yong YK, 'Design of a two degree of freedom resonant miniature robotic leg', IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM (2015) [E1]

Rios SA, Fleming AJ, Yong YK, 'Design and characterization of a miniature monolithic piezoelectric hexapod robot', IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM (2016) [E1]

Rios SA, Fleming AJ, Yong YK, 'Miniature Resonant Ambulatory Robot', IEEE Robotics and Automation Letters, 2 337-343 (2017)

Students

Program Research Title
PhD
Faculty of Engineering and Built Environment
Miniature Ambulatory Robots Driven by Piezoelectric Bimorph Benders: Design, Drive and Control Methods

Collaborators

Name Organisation
Doctor Andrew John Fleming University of Newcastle

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News

Batterham Medal awarded to UON engineering innovator

November 28, 2016

Dr Andrew Fleming has been awarded the 2016 Batterham Medal by the Academy of Technology and Engineering (ATSE) at an award ceremony in Melbourne.

Australian Research Council (ARC)

ARC Linkage Infrastructure, Equipment and Facilities (LIEF) funding success 2016

November 5, 2015

Associate Professor Andrew Fleming, Professor Rob Atkin, Professor Erica Wanless, Dr Stuart Prescott, Professor Robert Melchers, Dr John Holdsworth, Dr Patrick Cullen and Associate Professor Patrick Spicer have been awarded $440,000 in ARC Linkage Infrastructure, Equipment and Facilities (LIEF) funding commencing in 2016 for a Facility for Nanometer Scale Microscopy, Characterization, and Fabrication.

Australian Research Council (ARC)

ARC Discovery Project funding success

November 19, 2014

Dr Andrew Fleming has been awarded more than $266,000 in ARC Discovery Project funding commencing in 2015 for his research project Atomic Resolution Sensors for Imaging and Metrological Science.

Dr Mark Lock

$8.8M ARC funding

November 8, 2013

The Australian Research Council (ARC) has today awarded $8.8 million in Discovery Project research funding to the University of Newcastle. The funding will extend across 19 projects, an increase of 6 projects and $4.2 million since last year.

Dr Andrew Fleming

Position

Associate Professor
School of Electrical Engineering and Computing
Faculty of Engineering and Built Environment

Focus area

Electrical and Computer Engineering

Contact Details

Email andrew.fleming@newcastle.edu.au
Phone (02) 4921 6493
Mobile (02) 4921 7223
Fax (02) 4960 1712
Link Personal webpage

Office

Room EAG29
Building Engineering A Building
Location Callaghan
University Drive
Callaghan, NSW 2308
Australia
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