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Dr Ali Bazaei

Visiting Academic

School of Electrical Engineering and Computing

Career Summary

Biography

Holds Ph.D. degrees from University of Western Ontario, London, ON, Canada, and from Tarbiat Modares University, Tehran, Iran, and M.Sc. and B.Sc. degrees from Shiraz University, Shiraz, Iran, all in Electrical Engineering, in Jan. 2009, Jun. 2004, Aug. 1995, and Feb. 1992, respectively. From Sep. 1995 to Jan. 2000, he was an instructor with Yazd University, Yazd, Iran. From Sep. 2004 to Dec. 2005, he was a Research Assistant at the Department of Electrical and Computer Engineering, University of Western Ontario, London, ON, Canada. He is currently a Research Academic with the School of Electrical Engineering and Computer Science, The University of Newcastle, Australia. His research interests lie in the general area of nonlinear systems including control and modeling of structurally flexible systems, friction modeling and compensation, and neural networks.

Research Expertise

Summary of previous research:
1) Application of Quantitative Feedback Theory (QFT) to an uncertain nonlinear robot arm dynamics; treating the nonlinear system in large signal ranges without using any linearization techniques. QFT is regularly applied for robust control of linear-time-invariant (LTI) systems.
2) Development of a novel neural-network controller, as an Approximate Feedback Linearization method, for a fermentation process. The proposed technique efficiently concentrates the modeling capability of the neural network on the unknown part of the process (Gray-Box Modeling).
3) Extension of an on-line black-box neural-network position controller to a gray-box counterpart for friction compensation in a flexible link robot arm.
4) Derivation of a closed-from criterion to check the existence of state-space normal form for discrete-time nonlinear dynamic systems.
5) Development of an adaptive neural network training method for approximation of unknown multivariable mappings. Derivation of mathematical proofs for stability and convergence of the algorithm. The method was successfully used for force control in a multivariable robot arm interacting with an uncertain environment.
6) Proposition of a novel redefined output for control of end-point force in structurally flexible link robot arms, which has control limitations due to non-minimum-phase characteristics. Effectiveness of the proposed method was shown through mathematical analysis as well as experimental implementation.
7) Discovery of pre-stiction friction phenomenon as an intermediate friction regime between kinetic and static friction regimes. A new friction model was developed to capture the pre-stiction as well as static and kinetic regimes. Effectiveness of the friction model for friction compensation was successfully examined in an experimental positioning system.
8) Invention of three redefined outputs with more achievable control bandwidths to improve force control performance of flexible link arms. Effectiveness of the proposed methods was shown by mathematical analysis and experiment.
9) Discovery of a hysteresis phenomenon in friction between two slowly interaction bodies. A new friction model was offered to capture the hysteresis effect. The model was successfully implemented for friction compensation in a force control experimental setup. 10) Derivation of stability conditions and criteria for a novel switched control system, called Signal Transformation, for tracking of triangular trajectories. The method provides better control performance and less sensitivity to measurement noise. A methodology was offered to enhance robustness of the control scheme. The proposed method was successfully implemented for control of fast axis in a scanning probe microscope driven by a novel piezoelectric tube nano-positioner.
11) Design, calibration, and implementation of control systems for nano-positioning of a novel micro-machined electro-thermal actuator with built-in electro-thermal position sensor.
12) Discovery and demonstration of a fundamental limitation on control of end-point force in constrained flexible-link robot arms with friction.
13) Invention of transformation mappings for extension of the Signal Transformation method to cope with arbitrary desired trajectories. Achieved derivation of stability and convergence criteria for the proposed switched nonlinear control system.

Teaching Expertise
List of courses taught: Control System Design, Engineering Mathematics, Electromagnetism, Physical Electronics (Physics of Semiconductor Devices), Physics of Electricity and Magnetics, Electronics Circuits, Electric Circuits, Electrical Measurements, Electronics Lab. (I), Electricity Lab.

Administrative Expertise
Co-supervised a PhD strudent, Mr. Matthew Fairbairn.

Collaborations
Collaborated with: 1) ARC Centre of Excellence for Complex Dynamic Systems and Control, Laboratory for Dynamics and Control of NanoSystems, School of Electrical Engineering and Computer Science, The University of Newcastle Australia, University Drive, Callaghan, NSW 2308, Australia. 2) IBM Research, Zurich Research Laboratory, Säumerstrasse 4, CH-8803 Rüschlikon, Switzerland. 3) Department of Electrical and Computer Engineering, University of Western Ontario, London, ON, Canada. 4) Department of Electrical Engineering, Tarbiat Modares University, Tehran, Iran. 5) Department of Electrical Engineering, Shiraz University, Shiraz, Iran.

Qualifications

  • Doctor of Philosophy, University of Western Ontario - Canada

Keywords

  • Control System Design
  • Electric and Electronic Circuits
  • Electromagnetism
  • Engineering Mathematics
  • Force Control
  • Friction Modeling
  • Modeling and Control by Neural Networks
  • Modeling and Control of MEMS Devices
  • Nonlinear Control
  • Nonlinear Modeling and System Analysis
  • Physics of Electricity and Magnetics
  • Physics of Semiconductor Devices
  • Scanning Probe Devices
  • Structurally Flexible Mechanical Systems
  • Switched Control Systems

Languages

  • Persian (excluding Dari) (Fluent)

Fields of Research

Code Description Percentage
090602 Control Systems, Robotics and Automation 60
091306 Microelectromechanical Systems (MEMS) 20
091309 Tribology 20

Professional Experience

UON Appointment

Title Organisation / Department
Visiting Academic University of Newcastle
School of Electrical Engineering and Computing
Australia

Academic appointment

Dates Title Organisation / Department
1/08/2012 - 1/06/2014 Fellow UON

UON Research Grant

University of Newcastle
Australia
1/08/2011 - 1/07/2015 Fellow UON

UoN Research Fellowship

University of Newcastle
Australia
1/08/1995 - 1/01/2000 Lecturer Yazd University
Departments of Electrical Engineering and Physics
Iran, Islamic Republic of
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Publications

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


Chapter (2 outputs)

Year Citation Altmetrics Link
2015 Zhu Y, Moheimani SOR, Yuce MR, Bazaei A, 'Control issues of MEMS nanopositioning devices', Nanopositioning Technologies: Fundamentals and Applications 325-346 (2015)

© Springer International Publishing Switzerland 2016. In this chapter, the control issues of microelectromechanical system (MEMS) nanopositioning devices are introduced and discu... [more]

© Springer International Publishing Switzerland 2016. In this chapter, the control issues of microelectromechanical system (MEMS) nanopositioning devices are introduced and discussed. The real-time feedback control of a novel micro-machined 1-degree-of-freedom (1-DoF) thermal nanopositioner with on-chip electrothermal position sensors is presented. The actuation works based on the thermal expansion of V-shaped silicon beams. The sensing mechanism works based on measuring the resistance difference between two electrically biased identical silicon beams. The resistance difference varies with displacement. The heat conductance of the sensor beams varies oppositely with the position of the movable stage, resulting in different beam temperatures and resistances. A pair of position sensors are operated in differential mode to reduce low-frequency drift. The micro-machined nanopositioner has a nonlinear static input-output characteristic. The electrothermal actuator has a dynamic range of 14.4 µm and the electrothermal sensor has a low drift of 8.9 nm over 2000 s. An open-loop controller is first designed and implemented. It is experimentally shown that uncertainties result in unacceptable positioning performance. Hence, feedback control is required for accurate positioning. The on-chip displacement sensor is able to provide high-resolution displacement control. Therefore, a real-time closed-loop feedback control system is designed using a proportional-integral (PI) controller together with the nonlinear compensator used for the open-loop control system. The closed-loop system provides acceptable and robust tracking resolution for a wide range of set point values. The step response results show a positioning resolution of 7.9 nm and a time constant of 1.6 ms in a 10 µm stroke. For triangular reference tracking, which is required in raster-scanned scanning probe microscopy (SPM), the steady-state tracking error has a standard deviation of 20 nm within a wide range of 10 µm.

DOI 10.1007/978-3-319-23853-1_10
Co-authors Reza Moheimani
2011 Bazaei A, Yong YK, Moheimani SO, Sebastian A, 'High-speed, ultra-high-precision nanopositioning: A signal transformation approach', Control Technologies for Emerging Micro and Nanoscale Systems, Springer Verlag, Berlin, Heidelberg 47-65 (2011) [B1]
DOI 10.1007/978-3-642-22173-6
Co-authors Yuenkuan Yong, Reza Moheimani

Journal article (31 outputs)

Year Citation Altmetrics Link
2017 Bazaei A, Chen Z, Yong YK, Moheimani SOR, 'A Novel State Transformation Approach to Tracking of Piecewise Linear Trajectories', IEEE Transactions on Control Systems Technology, (2017)

In this paper, we propose a novel approach for tracking of piecewise linear trajectories, such as triangular and staircase waveforms. We derive state and input transformations, wh... [more]

In this paper, we propose a novel approach for tracking of piecewise linear trajectories, such as triangular and staircase waveforms. We derive state and input transformations, which result in closed-loop error dynamics driven by a series of impulses. The proposed control structure takes the form of an output-feedback-feedforward system that is straightforward to implement. In contrast to the recently proposed tracking control methods for such trajectories, the closed-loop stability is not affected by the frequency of the desired triangular reference. The method is implemented on a nanopositioner serving as the scanning stage of an atomic force microscope.

DOI 10.1109/TCST.2017.2654061
Citations Scopus - 1
Co-authors Zhiyong Chen, Reza Moheimani, Yuenkuan Yong
2017 Bazaei A, Yong YK, Moheimani SOR, 'Combining Spiral Scanning and Internal Model Control for Sequential AFM Imaging at Video Rate', IEEE-ASME TRANSACTIONS ON MECHATRONICS, 22 371-380 (2017) [C1]
DOI 10.1109/TMECH.2016.2574892
Co-authors Reza Moheimani, Yuenkuan Yong
2016 Bazaei A, Maroufi M, Fowler AG, Moheimani SOR, 'Internal Model Control for Spiral Trajectory Tracking with MEMS AFM Scanners', IEEE Transactions on Control Systems Technology, 24 1717-1728 (2016) [C1]

© 2016 IEEE. We demonstrate the application of internal model control for accurate tracking of spiral scan trajectories, where the reference signals are orthogonal sinusoids wh... [more]

© 2016 IEEE. We demonstrate the application of internal model control for accurate tracking of spiral scan trajectories, where the reference signals are orthogonal sinusoids whose amplitudes linearly vary with time. The plant is a 2-D microelectromechanical system nanopositioner equipped with in situ differential electrothermal sensors and electrostatic actuators. This device is used as the scanner stage in an atomic-force microscope. Additional internal model components are included in the controllers to compensate for the residual tracking errors due to plant nonlinearities. In a large scan range with a diameter of 16 µm, we achieved tracking of 1430-Hz spiral sinusoids, a frequency beyond the undamped fundamental resonance of the plant at 1340 Hz. This leads to a video-rate scan speed of 18 frames/s.

DOI 10.1109/TCST.2015.2508979
Citations Scopus - 2Web of Science - 2
Co-authors Reza Moheimani
2016 Bazaei A, Maroufi M, Reza Moheimani SO, 'On the modeling of tilted fixed-guided flexible beams under tension', Acta Mechanica, 227 333-352 (2016) [C1]

© 2015, Springer-Verlag Wien. We derive explicit solutions for a fixed-guided slender suspension beam that is initially straight and tilted with respect to the moving direction o... [more]

© 2015, Springer-Verlag Wien. We derive explicit solutions for a fixed-guided slender suspension beam that is initially straight and tilted with respect to the moving direction of its sliding end. The beam experiences substantial axial forces during the tension, resulting in a nonlinear boundary value problem. We consider sliding end displacements in the direction that cause longitudinal tension along the beam. We first propose an exact approach, leading to analytical solutions for various physical variables such as the transverse force and deflection profile, in terms of the axial force and the positive real solution of a third-order algebraic equation. We also propose an alternative approximate solution based on a second-order equation, which provides closed-form analytical solutions for the physical variables. We also introduce analytical validation techniques for the underlying assumptions. Consistency with nonlinear finite-element analysis is also addressed. Moreover, the results of the approximate method are represented by dimensionless formulas, generating charts to predict solutions for arbitrarily assigned beam parameters. Magnitudes of the normal and shear stress values are also included to consider the effects of yield and shear strengths as the limiting factors at large deflection conditions.

DOI 10.1007/s00707-015-1448-6
Citations Scopus - 1Web of Science - 1
Co-authors Reza Moheimani
2015 Maroufi M, Fowler AG, Bazaei A, Moheimani SOR, 'High-stroke silicon-on-insulator MEMS nanopositioner: Control design for non-raster scan atomic force microscopy', Review of Scientific Instruments, 86 (2015) [C1]

© 2015 AIP Publishing LLC. A 2-degree of freedom microelectromechanical systems nanopositioner designed for on-chip atomic force microscopy (AFM) is presented. The device is fabr... [more]

© 2015 AIP Publishing LLC. A 2-degree of freedom microelectromechanical systems nanopositioner designed for on-chip atomic force microscopy (AFM) is presented. The device is fabricated using a silicon-on-insulator-based process and is designed as a parallel kinematic mechanism. It contains a central scan table and two sets of electrostatic comb actuators along each orthogonal axis, which provides displacement ranges greater than ±10 µm. The first in-plane resonance modes are located at 1274 Hz and 1286 Hz for the X and Y axes, respectively. To measure lateral displacements of the stage, electrothermal position sensors are incorporated in the design. To facilitate high-speed scans, the highly resonant dynamics of the system are controlled using damping loops in conjunction with internal model controllers that enable accurate tracking of fast sinusoidal set-points. To cancel the effect of sensor drift on controlled displacements, washout controllers are used in the damping loops. The feedback controlled nanopositioner is successfully used to perform several AFM scans in contact mode via a Lissajous scan method with a large scan area of 20 µm × 20 µm. The maximum scan rate demonstrated is 1 kHz.

DOI 10.1063/1.4907908
Citations Scopus - 11Web of Science - 8
Co-authors Reza Moheimani
2015 Maroufi M, Bazaei A, Reza Moheimani SO, 'A high-bandwidth MEMS nanopositioner for on-chip AFM: Design, characterization, and control', IEEE Transactions on Control Systems Technology, 23 504-512 (2015) [C1]

© 1993-2012 IEEE. We report the design, characterization, and control of a high-bandwidth microelectromechanical systems (MEMS) nanopositioner for on-chip atomic force microscopy... [more]

© 1993-2012 IEEE. We report the design, characterization, and control of a high-bandwidth microelectromechanical systems (MEMS) nanopositioner for on-chip atomic force microscopy (AFM). For the fabrication, a commercially available process based on silicon-on-insulator is used. The device consists of a scan table, moved in the x - y plane by two sets of electrostatic comb actuators, capable of generating strokes in excess of ±5 µm. The first resonance frequencies of the nanopositioner are approximately 4.4 and 5.3 kHz in lateral directions. Electrothermal sensors are used to measure the displacement of the scan table. To enable fast scans, a dynamic model of the system is identified and used to design a feedback controller that damps the oscillatory behavior of the device. The nanopositioner is tested as the scanning stage of an AFM to perform high-speed scans.

DOI 10.1109/TCST.2014.2345098
Citations Scopus - 16Web of Science - 11
Co-authors Reza Moheimani
2015 Maroufi M, Bazaei A, Mohammadi A, Reza Moheimani SO, 'Tilted Beam Piezoresistive Displacement Sensor: Design, Modeling, and Characterization', Journal of Microelectromechanical Systems, (2015) [C1]

We present a comprehensive study of the design, modeling, and characterization of an on-chip piezoresistive displacement sensor. The design is based on the bulk piezoresistivity o... [more]

We present a comprehensive study of the design, modeling, and characterization of an on-chip piezoresistive displacement sensor. The design is based on the bulk piezoresistivity of tilted clamped-guided beams without the need for additional steps to generate doped regions. The sensor is implemented in a one-degree-of-freedom microelectromechanical system (MEMS) nanopositioner, where the beams also function as the suspension system. A standard MEMS fabrication process is used to realize the device on single-crystalline silicon as the structural material. The beams are oppositely tilted to develop tensile and compressive axial forces during stage movement, creating a differential sensing feature. An analytical approach is proposed for modeling and design of the tilted clamped-guided beams. The linearity of the sensor in the differential configuration is investigated analytically. The static, dynamic, and noise characteristics of the sensor are presented, followed by a model-based investigation of the measured dynamic feedthrough. [2015-0030]

DOI 10.1109/JMEMS.2015.2426180
Citations Scopus - 6Web of Science - 5
Co-authors Reza Moheimani
2014 Bazaei A, Moheimani SOR, 'Synthesis of modulated-demodulated control systems', Automatica, (2014) [C1]

We propose systematic design methods for realization of a given LTI compensator with complex poles using a modulated-demodulated control framework. Applicability of the proposed r... [more]

We propose systematic design methods for realization of a given LTI compensator with complex poles using a modulated-demodulated control framework. Applicability of the proposed realization methods is established through simulations performed on an undamped resonant plant compensated by a low gain controller to obtain better noise rejection performance. It is demonstrated how a modulated-demodulated structure may reduce the sampling rate in a hybrid control system. In addition, superior robust performance is achieved against variations in baseband parameters using direct reference injection into the modulated-demodulated control systems compared to the indirect injection approach. © 2014 Elsevier Ltd. All rights reserved.

DOI 10.1016/j.automatica.2014.05.015
Co-authors Reza Moheimani
2014 Bazaei A, Moheimani SOR, Yong YK, 'Improvement of transient response in signal transformation approach by proper compensator initialization', IEEE Transactions on Control Systems Technology, 22 729-736 (2014) [C1]

In this brief, the transient performance of the signal transformation approach (STA) is considerably enhanced by initializing the state vector of the compensator to appropriate va... [more]

In this brief, the transient performance of the signal transformation approach (STA) is considerably enhanced by initializing the state vector of the compensator to appropriate values. For triangular reference tracking, it is shown that the proposed method is identical to the impulsive state multiplication (ISM) approach. Through simulations and experiments, we also show that the proposed method can be equally applied to improve the STA for arbitrarily shaped desired signals, where ISM is not applicable. Tracking efficacy of the proposed method compared with that of an ordinary feedback loop with a similar noise rejection performance is also demonstrated. © 2013 IEEE.

DOI 10.1109/TCST.2013.2261875
Citations Scopus - 3Web of Science - 4
Co-authors Reza Moheimani, Yuenkuan Yong
2014 Bazaei A, Moheimani SOR, 'A comprehensive analysis of MEMS electrothermal displacement sensors', IEEE Sensors Journal, 14 3183-3192 (2014) [C1]

For electrothermal microelectromechanical system position sensors, we introduce a novel analytical model that captures the nonuniform distribution of temperature as well as the no... [more]

For electrothermal microelectromechanical system position sensors, we introduce a novel analytical model that captures the nonuniform distribution of temperature as well as the nonlinear dependence of resistivity on temperature. The proposed model also captures the effects of contoured beam heaters and the nonuniformity of the air gap between the heat-sink and the heaters, which varies with heat-sink position and is differentially transduced into the output voltage. The model accurately predicts the experimentally obtained I - V data and the corresponding sensor output. It also explains the considerable improvement achieved in the linearity of the sensor response when the beam profiles are appropriately shaped to yield a more uniform temperature distribution. The shaped sensor is compared with conventional uniform electrothermal sensors under two different operating conditions, voltage, and current bias modes. Improved linearity is observed in both cases. The model is also applicable to predict the dynamic response of the sensor. An iterative procedure is developed to solve the additional complexity in voltage mode, which is a nonlinear partial integro-differential equation. Considering different bias modes and heater profiles, we evaluate the sensor bandwidth and linearity using the model and conduct experiments to validate the results. Based on first principles, the proposed model is more transparent than sophisticated software-based approaches and compatible with traditional solvers in MATLAB. © 2014 IEEE.

DOI 10.1109/JSEN.2014.2326685
Citations Scopus - 2Web of Science - 1
Co-authors Reza Moheimani
2014 Yong YK, Bazaei A, Moheimani SOR, 'Video-rate lissajous-scan atomic force microscopy', IEEE Transactions on Nanotechnology, 13 85-93 (2014) [C1]

Raster scanning is common in atomic force microscopy (AFM). The nonsmooth raster waveform contains high-frequency content that can excite mechanical resonances of an AFM nanoposit... [more]

Raster scanning is common in atomic force microscopy (AFM). The nonsmooth raster waveform contains high-frequency content that can excite mechanical resonances of an AFM nanopositioner during a fast scan, causing severe distortions in the resulting image. The mainstream approach to avoid scan-induced vibrations in video-rate AFM is to employ a high-bandwidth nanopositioner with the first lateral resonance frequency above 20 kHz. In this paper, video-rate scanning on a nanopositioner with 11.3-kHz resonance frequency is reported using a smooth Lissajous scan pattern. The Lissajous trajectory is constructed by tracking two sinusoidal waveforms on the lateral axes of the nanopositioner. By combining an analog integral resonant controller (IRC) with an internal model controller, 1-and 2-kHz single tone set-points were successfully tracked. High-quality time lapsed AFM images of a calibration grating recorded at 9 and 18 frames/s without noticeable image distortions are reported. © 2013 IEEE.

DOI 10.1109/TNANO.2013.2292610
Citations Scopus - 15Web of Science - 13
Co-authors Reza Moheimani, Yuenkuan Yong
2014 Bazaei A, Maroufi M, Mohammadi A, Moheimani SOR, 'Displacement sensing with silicon flexures in MEMS nanopositioners', Journal of Microelectromechanical Systems, 23 502-504 (2014) [C1]

We report a novel piezoresistive microelectromechanical system (MEMS) differential displacement sensing technique with a minimal footprint realized through a standard MEMS fabrica... [more]

We report a novel piezoresistive microelectromechanical system (MEMS) differential displacement sensing technique with a minimal footprint realized through a standard MEMS fabrication process, whereby no additional doping is required to build the piezoresistors. The design is based on configuring a pair of suspension beams attached to a movable stage so that they experience opposite axial forces when the stage moves. The resulting difference between the beam resistances is transduced into a sensor output voltage using a half-bridge readout circuit and differential amplifier. Compared with a single piezoresistive flexure sensor, the design approximately achieves 2, 22, and 200 times improvement in sensitivity, linearity, and resolution, respectively, with 1.5-nm resolution over a large travel range exceeding 12 ?m. © 2014 IEEE.

DOI 10.1109/JMEMS.2014.2316325
Citations Scopus - 16Web of Science - 14
Co-authors Reza Moheimani
2013 Fowler AG, Bazaei A, Moheimani SOR, 'Design and Analysis of Nonuniformly Shaped Heaters for Improved MEMS-Based Electrothermal Displacement Sensing', JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, 22 687-694 (2013) [C1]
DOI 10.1109/JMEMS.2013.2240261
Citations Scopus - 18Web of Science - 16
Co-authors Reza Moheimani
2012 Bazaei A, Moheimani SO, 'Signal transformation approach to tracking control with arbitrary references', IEEE Transactions on Automatic Control, 57 2294-2307 (2012) [C1]
DOI 10.1109/TAC.2012.2186474
Citations Scopus - 4Web of Science - 4
Co-authors Reza Moheimani
2012 Bazaei A, Yong YK, Moheimani SO, 'High-speed Lissajous-scan atomic force microscopy: Scan pattern planning and control design issues', Review of Scientific Instruments, 83 (2012) [C1]
DOI 10.1063/1.4725525
Citations Scopus - 52Web of Science - 43
Co-authors Reza Moheimani, Yuenkuan Yong
2012 Bazaei A, Yong YK, Moheimani SO, Sebastian A, 'Tracking of triangular references using signal transformation for control of a novel AFM scanner stage', IEEE Transactions on Control Systems Technology, 20 453-464 (2012) [C1]
DOI 10.1109/TCST.2011.2114347
Citations Scopus - 38Web of Science - 36
Co-authors Yuenkuan Yong, Reza Moheimani
2012 Bazaei A, Moallem M, 'A fundamental limitation on the control of end-point force in a very flexible single-link arm', Journal of Vibration and Control, 18 1207-1220 (2012) [C1]
Citations Scopus - 1Web of Science - 1
2012 Bazaei A, Zhu Y, Moheimani SO, Yuce MR, 'Analysis of nonlinear phenomena in a thermal micro-actuator with a built-in thermal position sensor', IEEE Sensors Journal, 12 1772-1784 (2012) [C1]
DOI 10.1109/JSEN.2011.2178236
Citations Scopus - 17Web of Science - 15
Co-authors Reza Moheimani
2011 Bazaei A, Moheimani SO, Sebastian A, 'An analysis of signal transformation approach to triangular waveform tracking', Automatica, 47 838-847 (2011) [C1]
DOI 10.1016/j.automatica.2011.01.075
Citations Scopus - 9Web of Science - 8
Co-authors Reza Moheimani
2011 Bazaei A, Moallem M, 'Friction hysteresis modeling and force control in a constrained single-link arm', Journal of Dynamic Systems, Measurement and Control, 133 (2011) [C1]
DOI 10.1115/1.4004580
Citations Scopus - 1Web of Science - 1
2011 Zhu Y, Bazaei A, Moheimani SO, Yuce MR, 'Design, modeling, and control of a micromachined nanopositioner with integrated electrothermal actuation and sensing', Journal of Microelectromechanical Systems, 20 711-719 (2011) [C1]
DOI 10.1109/JMEMS.2011.2140358
Citations Scopus - 37Web of Science - 29
Co-authors Reza Moheimani
2011 Bazaei A, Moallem M, 'Improving force control bandwidth of flexible-link arms through output redefinition', IEEE-ASME Transactions on Mechatronics, 16 380-386 (2011) [C1]
DOI 10.1109/tmech.2010.2046332
Citations Scopus - 16Web of Science - 10
2010 Bazaei A, Moallem M, 'Prestiction Friction Modeling and Position Control in an Actuated Rotary Arm', IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 59 131-139 (2010) [C1]
DOI 10.1109/TIM.2009.2022109
Citations Scopus - 8Web of Science - 6
2010 Zhu Y, Bazaei A, Moheimani SO, Yuce MR, 'A micromachined nanopositioner with on-chip electrothermal actuation and sensing', IEEE Electron Device Letters, 31 1161-1163 (2010) [C1]
DOI 10.1109/LED.2010.2058841
Citations Scopus - 23Web of Science - 20
Co-authors Reza Moheimani
2010 Bazaei A, Yong YK, Moheimani SOR, Sebastian A, 'Tracking Control of a Novel AFM Scanner using Signal Transformation Method', IEEE Transactions on Control Systems Technology, 20 453-464 (2010) [C1]
DOI 10.1109/TCST.2011.2114347
Co-authors Yuenkuan Yong, Reza Moheimani
2009 Bazaei A, Moallem M, 'Force transmission through a structurally flexible beam: Dynamic modeling and feedback control', IEEE Transactions on Control Systems Technology, 17 1245-1256 (2009) [C1]
DOI 10.1109/TCST.2008.2006184
Citations Scopus - 16Web of Science - 9
2007 Bazaei A, Moallem M, 'Online neural identification of multi-input multi-output systems', IET CONTROL THEORY AND APPLICATIONS, 1 44-50 (2007)
DOI 10.1049/iet-cta:20050259
Citations Scopus - 3Web of Science - 3
2007 Bazaei A, Majd VJ, 'An alternative way to test the criteria ensuring the existence of discrete-time normal form', SYSTEMS & CONTROL LETTERS, 56 315-319 (2007)
DOI 10.1016/j.sysconle.2006.10.010
Citations Scopus - 1
2006 Bazaei A, Majd VJ, 'Neuro-adaptive friction compensation for single-link flexible robots using serial-gray-box modeling strategy', JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME, 128 297-306 (2006)
DOI 10.1115/1.2192838
Citations Scopus - 2Web of Science - 1
2006 Bazaei A, Johari Majd V, 'Application of Affine Gray-Box Neural Models for Nonlinear Control of Chemical Processes', Iranian Journal of Chemical Engineering, 3 65-76 (2006)
2003 Bazaei A, Majd VJ, 'Feedback linearization of discrete-time nonlinear uncertain plants via first-principles-based serial neuro-gray-box models', JOURNAL OF PROCESS CONTROL, 13 819-830 (2003) [C1]
DOI 10.1016/S0959-1524(03)00027-1
Citations Scopus - 11Web of Science - 4
Show 28 more journal articles

Conference (25 outputs)

Year Citation Altmetrics Link
2015 Bazaei A, Yong YK, Moheimani SOR, 'Internal model control for high-speed spiral scan AFM', 2015 Australian Control Conference, AUCC 2015 (2015) [E1]

© 2015 Engineers Australia. We report on a novel application of internal model control for accurate tracking of a high speed spiral trajectory in scanning probe microscopy. With ... [more]

© 2015 Engineers Australia. We report on a novel application of internal model control for accurate tracking of a high speed spiral trajectory in scanning probe microscopy. With a closed-loop bandwidth of only 1 kHz, we achieved tracking errors as low as 0.31% of the scan diameter and an ultra-video frame rate of 37.5 frames per second (FPS) for a high pitch spiral trajectory generated by amplitude modulation of 3 kHz sinusoids.

Citations Scopus - 1Web of Science - 1
Co-authors Yuenkuan Yong, Reza Moheimani
2015 Ferdosian M, Abdi H, Bazaei A, 'Improving the wind energy conversion system dynamics during fault ride through: UPFC versus STATCOM', Proceedings of the IEEE International Conference on Industrial Technology (2015) [E1]

© 2015 IEEE. There is a continuously growing demand for wind power generation capacity. This situation forces the revision of the grid codes requirements, to remain connected dur... [more]

© 2015 IEEE. There is a continuously growing demand for wind power generation capacity. This situation forces the revision of the grid codes requirements, to remain connected during grid faults, i.e., to ride through the faults, and contribute to system stability during fault condition. In a typical fault condition, the voltage at the Point of Common Coupling (PCC) drops below 80% immediately and the rotor speed of induction generators becomes unstable. In this paper, STATCOM and UPFC are used to improving the low voltage ride- through (LVRT) of wind energy conversion system (WECS) and to damp the rotor speed oscillations of induction generator under fault conditions. Furthermore, the performances of these two equipments are compared with each other. STATCOM can only recover voltage after fault clearing at the terminals of the wind energy conversion system (WECS), while controlling the UPFC as a virtual inductor can lead to increase the voltage at the WECS terminals during the fault clearing. The simulation results show that the UPFC is better than STATCOM in improving the LVRT and rotor stability of the WECS. Also, the simulation results show that UPFC can improve the voltage at the PCC in the fault period, with the voltage at the PCC easily recovering to 1pu, simultaneously. STATCOM can recover the voltage at the PCC only after the fault clearing with a high risk of decreasing the PCC voltage to zero during the fault.

DOI 10.1109/ICIT.2015.7125499
Citations Scopus - 2
2015 Bazaei A, Maroufi M, Moheimani SOR, 'Noise resilient 2-DoF washout tracking controller for nanopositioning systems subject to sensor drift', Proceedings of the American Control Conference (2015) [E1]

© 2015 American Automatic Control Council. We propose a two-degree-of-freedom washout control structure for tracking of sinusoidal references in lightly damped structures subject... [more]

© 2015 American Automatic Control Council. We propose a two-degree-of-freedom washout control structure for tracking of sinusoidal references in lightly damped structures subject to sensor drift and measurement noise. An algorithm is derived, assigning stable parameter intervals to a second-order washout damping compensator for a resonant plant with a single dominant mode. Simulation results demonstrate quality drift and noise rejection performance of the proposed method, when tracking a 3 kHz sinusoidal reference in a nanopositioning stage with a 4.5 kHz resonance frequency. Experiments are conducted, validating high efficacy of the proposed washout tracking control strategy.

DOI 10.1109/ACC.2015.7170896
Co-authors Reza Moheimani
2015 Bazaei A, Fowler AG, Maroufi M, Moheimani SOR, 'Tracking of spiral trajectories beyond scanner resonance frequency by a MEMS nanopositioner', 2015 IEEE Conference on Control and Applications, CCA 2015 - Proceedings (2015) [E1]

© 2015 IEEE. This paper presents a novel application of internal model control (IMC) for high-precision tracking of spiral reference signals generated by single-tone sine waves. ... [more]

© 2015 IEEE. This paper presents a novel application of internal model control (IMC) for high-precision tracking of spiral reference signals generated by single-tone sine waves. In contrast to the existing spiral tracking control methods, the IMC approach provides zero steady-state tracking error for linear-time-invariant plants. An application of the proposed method is demonstrated with a two-axis microelectromechanical system (MEMS) stage that has a dominant resonance frequency of 1.3 kHz. Using a reference sinusoidal frequency of 1.4 kHz, the stage can scan a 16 µm-diameter area within 55ms with a root-mean-squared (rms) tracking error of 20nm.

DOI 10.1109/CCA.2015.7320745
Co-authors Reza Moheimani
2014 Bazaei A, Mohammadi A, Reza Moheimani SO, 'Sensing bandwidth of electrothermal MEMS transducers in constant voltage and current modes', 2014 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM) (2014) [E1]
DOI 10.1109/AIM.2014.6878289
Citations Scopus - 1Web of Science - 1
Co-authors Reza Moheimani
2014 Bazaei A, Maroufi M, Mohammadi A, Reza Moheimani SO, 'Development of a MEMS position transducer using bulk piezoresistivity of suspensions', 2014 IEEE/ASME International Conference on Advanced Intelligent Mechatronics AIM (2014) [E1]
DOI 10.1109/AIM.2014.6878290
Co-authors Reza Moheimani
2014 Fowler AG, Maroufi M, Bazaei A, Moheimani SOR, 'MEMS Nanopositioner for Lissajous-Scan Atomic Force Microscopy', ASME Proceedings: Dynamic Systems and Control Conference (2014) [E1]
DOI 10.1115/DSCC2014-6044
Citations Scopus - 2
Co-authors Reza Moheimani
2013 Ferdosian M, Abdi M, Bazaei A, 'Improved Dynamic Performance of Wind Energy Conversion System by UPFC', 2013 IEEE International Conference On Industrial Technology (ICIT) (2013) [E1]
DOI 10.1109/ICIT.2013.6505730
Citations Scopus - 14Web of Science - 10
2013 Bazaei A, Fowler AG, Moheimani SOR, 'Nonlinear analysis of electrothermal position sensors with contoured heaters', Proceedings of IEEE Sensors (2013) [E2]

For electrothermal MEMS position sensors, we introduce a novel analytical model capturing the nonuniform distribution of temperature as well as the nonlinear temperature profile o... [more]

For electrothermal MEMS position sensors, we introduce a novel analytical model capturing the nonuniform distribution of temperature as well as the nonlinear temperature profile of resistivity. The proposed model also includes the effects of contoured beam heaters and the nonuniform proximity of the heatsink, which changes with heatsink position and is differentially transduced into output voltage. The model predicts the experimental I-V data and the sensor output accurately. It also reveals a considerable improvement in the linearity of the sensor response when the beam profiles are appropriately shaped to yield a more uniform temperature distribution. The shaped sensor is compared with conventional electrothermal sensors with uniform beam cross sections under two different conditions, equal bias voltages and equal average temperatures, where improved linearity is achieved in both cases. © 2013 IEEE.

DOI 10.1109/ICSENS.2013.6688349
Citations Scopus - 1
Co-authors Reza Moheimani
2013 Bazaei A, Moheimani SOR, 'Realization of a class of compensators by modulated-demodulated structures with application in tracking of biased sinusoids', Proceedings of the American Control Conference (2013) [E1]
Citations Scopus - 1
Co-authors Reza Moheimani
2013 Bazaei A, Fowler AG, Moheimani SOR, 'Nonlinear Analysis of Electrothermal Position Sensors with Contoured Heaters', 2013 IEEE SENSORS (2013)
Co-authors Reza Moheimani
2013 Piriyanont B, Moheimani SOR, Bazaei A, 'Design and Control of a MEMS Micro-gripper with Integrated Electro-thermal Force Sensor', 2013 3rd Australian Control Conference (AUCC) (2013) [E1]
DOI 10.1109/AUCC.2013.6697320
Citations Scopus - 7Web of Science - 5
Co-authors Reza Moheimani
2013 Yong YK, Bazaei A, Moheimani SOR, 'Control of a High-Speed Nanopositioner for Lissajous-scan Video-rate AFM', 2013 3rd Australian Control Conference (AUCC) (2013) [E1]
DOI 10.1109/AUCC.2013.6697268
Citations Scopus - 1
Co-authors Yuenkuan Yong, Reza Moheimani
2012 Bazaei A, Fowler AG, Moheimani SO, 'Improved electrothermal position sensing in MEMS with non-uniformly shaped heaters', 11th IEEE Sensors 2012. Proceedings (2012) [E1]
Citations Scopus - 2
Co-authors Reza Moheimani
2012 Bazaei A, Moheimani SO, 'Improving transient performance of signal transformation approach', Proceedings of the 51st IEEE Conference on Decision and Control (2012) [E1]
Co-authors Reza Moheimani
2012 Yong YK, Bazaei A, Moheimani SO, Allgower F, 'Design and control of a novel non-raster scan pattern for fast scanning probe microscopy', 2012 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM) Proceedings (2012) [E1]
Citations Scopus - 6Web of Science - 5
Co-authors Reza Moheimani, Yuenkuan Yong
2011 Zhu Y, Bazaei A, Moheimani SO, Yuce MR, 'Design, prototyping, modeling and control of a MEMS nanopositioning stage', 2011 American Control Conference (2011) [E1]
Citations Scopus - 5
Co-authors Reza Moheimani
2010 Bazaei A, Moheimani SO, Sebastian A, 'Stability of signal transformation method for triangular waveform tracking', 2010 49th IEEE Conference on Decision and Control, CDC 2010 (2010) [E1]
DOI 10.1109/CDC.2010.5717633
Co-authors Reza Moheimani
2010 Bazaei A, Yong YK, Moheimani SO, Sebastian A, 'Tracking control of a novel AFM scanner using signal transformation method', Preprints of the 5th IFAC Symposium on Mechatronic Systems (2010) [E1]
Citations Scopus - 3
Co-authors Reza Moheimani, Yuenkuan Yong
2004 Bazaei A, Johari Majd V, 'Compromise between Modeling and Control Performance of a Flexible-Link Arm in the Filtered-Error Neural Based Method', 12th International Symposium of Mechanical Engineering (ISME) (2004)
2003 Moghaddam MM, Bazaei A, 'On approximate feedback linearization of robot manipulators', International Conference on Control and Automation (2003)

In this research, a control scheme is proposed that provides a control law with lower complexity via an approximate feedback linearization methodology. This method uses the idea o... [more]

In this research, a control scheme is proposed that provides a control law with lower complexity via an approximate feedback linearization methodology. This method uses the idea of exact linearization of an approximate imaginary robot with an inertia matrix that has zero Riemannian curvature. An optimal least-square procedure is presented for the selection of system parameters that reduces the tracking errors considerably. © 2003 IEEE.

Citations Scopus - 2
2002 Bazaei A, Johari Majd V, 'Feedback Linearization of a Fermentation Process via Serial Gray-Box Neural Models', 10th Iranian Conference on Electrical Engineering (2002)
2002 Bazaei A, Johari Majd V, 'Nonlinear Control of a Class of Partially Known Chemical Processes via Affine Gray-Box Neural Models', 7th National Iranian Chemical Engineering Congress (2002)
1998 Momeni H, Montazer GA, Khaiatian A, Bazaei A, 'Composite Adaptive Control of a One-Joint Robot using Bounded Gain Forgetting Estimator', The First Annual Seminar of Automation, Robotics & Control (ARC) (1998)
1996 Momeni H, Montazer GA, Khaiatian A, Bazaei A, 'Robustness of Adaptive Control and QFT Method in Uncertain Nonlinear Systems', The Second World Automation Congress (WAC) (1996)
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Grants and Funding

Summary

Number of grants 4
Total funding $485,368

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


20151 grants / $1,500

2015 American Control Conference, Chicago USA, 1-3 July 2015$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 Ali Bazaei
Scheme Travel Grant
Role Lead
Funding Start 2015
Funding Finish 2015
GNo G1500261
Type Of Funding Internal
Category INTE
UON Y

20122 grants / $16,200

Research Fellowship Start-up Grant$15,000

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Ali Bazaei
Scheme Fellowship Grant
Role Lead
Funding Start 2012
Funding Finish 2012
GNo G1200940
Type Of Funding Internal
Category INTE
UON Y

IEEE Sensors 2012, Taipei, 28-31 October 2012$1,200

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

Funding body University of Newcastle - Faculty of Engineering & Built Environment
Project Team Doctor Ali Bazaei
Scheme Travel Grant
Role Lead
Funding Start 2012
Funding Finish 2012
GNo G1200949
Type Of Funding Internal
Category INTE
UON Y

20111 grants / $467,668

2011 Research Fellowship - DVCR Strategic Appointment $467,668

Funding body: University of Newcastle

Funding body University of Newcastle
Project Team Doctor Ali Bazaei
Scheme Postdoctoral Research Fellowship
Role Lead
Funding Start 2011
Funding Finish 2015
GNo G1100823
Type Of Funding Internal
Category INTE
UON Y
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Research Supervision

Number of supervisions

Completed1
Current0

Past Supervision

Year Level of Study Research Title Program Supervisor Type
2013 PhD Feedback Control of the Atomic Force Microscope Micro-cantilever for Improved Imaging PhD (Electrical Engineering), Faculty of Engineering and Built Environment, The University of Newcastle Co-Supervisor
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Dr Ali Bazaei

Positions

Visiting Academic
Laboratory for Dynamics and Control of NanoSystems
School of Electrical Engineering and Computing
Faculty of Engineering and Built Environment

Casual Academic
Laboratory for Dynamics and Control of NanoSystems
School of Electrical Engineering and Computing
Faculty of Engineering and Built Environment

Contact Details

Email ali.bazaei@newcastle.edu.au
Phone 0249215372

Office

Room ES134
Building ES
Location School of Electrical Engineering and Computer Science, Callaghan
University Drive
Callaghan, NSW 2308
Australia
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