Address: Department of Electrical Engineering College of Engineering American University of Sharjah P.O.Box 26666 Sharjah, United Arab Emirates Room: EL115 Office: +(971) (6) 5152927 Fax: +(971) (6) 5152979 E-mail: rdhaouadi@aus.edu

Research Interests

Servo and adjustable speed drive systems, power electronics, field-oriented control of ac motor drives, control of electro-mechanical systems using linear, nonlinear and adaptive control methods, real time digital control and DSP/Microcomputer-based controllers (hardware, software). Systems of particular interest include rolling mill drives, harmonic drive systems and robot manipulators.

Biography

Dr. Dhaouadi has been on the faculty of the American University of Sharjah since August 2000. He worked before as a visiting researcher at the Hitachi research Laboratory where he was involved in the design and development of high performance speed control systems for rolling mill drives. He was involved also with the research of advanced motor control techniques for induction motors and synchronous motor drive systems. Then he joined the Trondheim Institute of Technology in Norway as a visiting scholar to work on the design and development of power supply and control systems for sub-sea oil-field pumps. The research project was in collaboration with ABB Norway. After joining the University of Tunis in 1994, he established a collaboration program with Rice University to work on an NSF funded project. He was involved with research in the area of modeling, analysis and control of electromechanical systems with harmonic drive gears with particular application to high performance robotic positioning systems.

Publications

REFEREED JOURNAL PUBLICATIONS

1. Dhaouadi, R., Ghorbel, F. and Gandhi, P., "A New Dynamic Model of Hysteresis in harmonic Drives," submitted to the IEEE Transactions on Industrial Electronics.

2. Dhaouadi, R., and Ghorbel, F., "Modeling and Analysis of Hysteresis in harmonic Drive Gears," submitted to the IMACS Journal on Systems Analysis Modelling Simulation, Special Issue on the 16th IMACS World Congress 2000.

3. Dhaouadi, R., and Nouri, K., "Neural Network-Based Speed Control of A Two-Mass-Model System," Journal of Advanced Computational Intelligence, Vol. 3, No. 5, 1999.

4. Dhaouadi, R., and Kubo, K., "A Nonlinear Control Method for Good Dynamic Performance Elastic Drives," IEEE Transactions on Industrial Electronics, Vol. 46, No. 4, August 1999, pp. 868-870.

5. Dhaouadi, R., and Kubo, K., "Analysis and Design of a Nonlinear Control Concept Applied to Two-Mass-Model Elastic Drive Systems," AMSE Journal, Advances in Modeling and Analysis, Series C, Vol. 53, No. 2, 1999, pp. 27-44.

6. Dhaouadi, R., and Nouri, K., "Feedforward Control of an Elastic Drive System Using Neural Networks," Les Annales Maghrébines de l'Ingénieur, Vol. 12, N°. Hors Série, November 1998, pp. 187-192.

7. Dhaouadi, R., Kubo, K. and Tobise, M., "Analysis and Compensation of Speed Drive Systems With Torsional Loads," IEEE Transactions on Industry Applications, Vol. 30, No. 3, May/June 1994, pp. 760-766.

8. Dhaouadi, R., Kubo, K. and Tobise, M., "Two-Degree-of-Freedom Robust Speed Controller for High Performance Rolling Mill Drives," IEEE Transactions on Industry Applications, Vol. 29, No. 5, September/October 1993, pp. 919-926.

9. Kazmierkowski, M.P., Mohan, N., and Dhaouadi, R., "Space Vector Based Current Controller for Transistor PWM-Inverter-Fed Permanent Magnet Synchronous Motor Drives," AMSE Journal. Modeling, Simulation and Control, Series A, Vol. 42, No.1, 1992, pp. 49-64.

10. Dhaouadi, R., Mohan, N., and Norum, L., "Design and Implementation Of An Extended Kalman Filter For The State Estimation of a Permanent Magnet Synchronous Motor," IEEE Transactions On Power Electronics, Vol. 6, No. 3, July 1991, pp. 491-497.

11. Dhaouadi, R., and Mohan, N., "Analysis of Current Regulated Voltage Source Inverters for Permanent Magnet Synchronous Motor Drives in Normal and Extended Speed Ranges," IEEE Transactions on Energy Conversion, Vol. 5, No. 1, March 1990, pp. 137-144.

REFEREED CONFERENCE PUBLICATIONS

1. Dhaouadi, R., "Analysis and Compensation of Hysteresis in Harmonic Drives," Accepted for presentation and publication at the 45th International Conference on Intelligent Motion PCIM Europe 2002, Nuremberg, Germany, May 14-16, 2002.

2. Dhaouadi, R., Gandhi, P. and Ghorbel, F., "Dynamic Modeling of Hysteresis in Harmonic Drives," CD ROM proceedings of the 9th European Conference on Power Electronics and Applications EPE'2001, Graz, Austria, August 27-29, 2001, Paper No. PP00225.

3. Nouri, K., Dhaouadi, R., and BenHadj Braiek, N., "Adapting Back-propagation Algorithm for Training Recurrent Multi-layers Networks," Proceedings of the International Conference on Smart Systems and Devices, Hammamet, Tunisia, March 27-30, 2001, pp. 363-368.

4. Dhaouadi, R., and Ghorbel, F., "An Integrated Environment for Modeling, Simulation and Control of Harmonic Drive Systems," Proceedings of the International NAISO Congress on Information Science Innovations ISI'2001, American University of Dubai, U.A.E., March 17-21, 2001, Paper No. 1693-235.

5. Dhaouadi, R., Ghorbel, F., and Gandhi, P., "Modeling and Analysis of Hysteresis in Harmonic Drive Gears,'' CDROM Proceedings, 16th IMACS World Congress 2000 on Scientific Computation, Applied Mathematics and Simulation, Lausanne, Switzerland, August 21-25, 2000, File No. 611-2.

6. Ndongar, M., and Dhaouadi, R., "Identification et commande d'un système d'entraînement électrique par réseau de neurones," Proc. of the ``19èmes Journées Tunisiennes d'Electrotechnique et d'Automatique," JTEA'2000, Nabeul-Hammamet, Tunisie, march 2000.

7. Nouri, K., and Dhaouadi, R., "Structure de commande neuronale d'un système à deux masses," Proc. of the "18èmes Journées Tunisiennes d'Electrotechnique et d'Automatique," JTEA'98, Nabeul, Tunisie, November 1998, Vol. 1, pp. 296-302.

8. Dhaouadi, R., "Optimization of the speed transient response in an Elastic Drive System Using a Nonlinear Damping Controller," Proc. of the CESA'98 IMACS-IEEE Multiconference, Nabeul-Hamamet, Tunisia, April 1998, Vol.1, pp. 697-701.

9. Dhaouadi, R., and Kubo, K., "A Nonlinear Vibration Damping Controller for Two-Mass-Model Drive Systems," Proc. of the 7th European Conference on Power Electronics and Applications (EPE'97), Trondheim, Norway, 8-10 September 1997, Vol. 3, pp. 637-642.

10. Dhaouadi, R., and Kubo, K., "A New Control Scheme for Vibration Suppression in Two-Mass-Model Elastic Systems," CD-ROM Proceedings of the International Conference on Advanced Intelligent Mechatronics (AIM'97), Tokyo, Japan, June 1997, pp. 126-131.

11. Ben-Brahim, L., and Dhaouadi, R., "Disturbance observer based robust force control of a robot manipulator," Proc. of the 4th International Conference on Control, Automation, Robotics and Vision (ICARCV'96), Singapore, 3-6 December 1996, pp. 196-200.

12. Ben-Brahim, L., and Dhaouadi, R., "Robust Force Control of a Robot Manipulator Without Force Sensor," Proc. of the "16èmes Journées Tunisiennes d'Electrotechnique et d'Automatique," JTEA'96, Nabeul, Tunisie, November 1996, Vol. 1, pp. 244-252.

13. Ben-Brahim, L., and Dhaouadi, R., ``Tracking Control of Robot Manipulators," Proc. of the "16èmes Journées Tunisiennes d'Electrotechnique et d'Automatique," JTEA'96, Nabeul, Tunisie, November 1996, Vol. 1, pp. 253-262.

14. Jendoubi, M., and Dhaouadi, R., "Commande numerique directe d'un moteur synchrone autopiloté," Proc. of the "16èmes Journées Tunisiennes d'Electrotechnique et d'Automatique," JTEA'96, Nabeul, Tunisie, November 1996, Vol.2, pp. 204-212.

15. Raissi, K., Gasmi, M., and Dhaouadi, R., "Structure de commande d'un système élastique," Proc. of the "16èmes Journées Tunisiennes d'Electrotechnique et d'Automatique," JTEA'96, Nabeul, Tunisie, November 1996, Vol. 1, pp. 62-67.

16. Dhaouadi, R., and Kubo, K., "Transfer Function and Parameters Identification of a Motor Drive System Using Adaptive Filtering," Proc. of the 4th International Workshop on Advanced Motion Control (AMC'96), Mie University, Japan, March 18-21 1996, pp. 538-593.

17. Dhaouadi, R., and Kubo, K., "Parameters Identification of a Mechanical System in the Presence of Noise and Disturbances," Proc. of the "15èmes Journées Tunisiennes d'Electrotechnique et d'Automatique," JTEA'95, Nabeul, Tunisie, November 1995, Vol. 1, pp. 77-83.

18. Ben-Brahim, L., and Dhaouadi, R., "Self-Tuning Force Controller for a Robot Manipulator Using Neural Networks," Proc. of the "15èmes Journées Tunisiennes d'Electrotechnique et d'Automatique," JTEA'95, Nabeul, Tunisie, November 1995, Vol. 1, pp. 69-76.

19. Dhaouadi, R., Kubo, K., and Tobise, M., "Analysis and Compensation of Speed Drive Systems With Torsional Loads," Proc. of the Power Conversion Conference PCC-Yokohama, Japan, April 19-21, 1993, pp. 271-277.

20. Dhaouadi, R., and Kubo, K., "Robust Vibration Suppression Control For Industrial Speed Drives," Proc. of the 6th Workshop on Control Theory Applications, SICE, Japan, February 1993, pp. 29-32.

21. Dhaouadi, R., Kubo, K., and Tobise, M., "Two-Degree-of-Freedom Robust Speed Controller for High Performance Rolling Mill Drives," Proc. of the IEEE Industry Applications Society, Annual Meeting (IAS'92), Houston, Texas, USA, October 1992, pp. 400-407.

22. Dhaouadi, R., Kubo, K., and Tobise, M., "Vibration Suppression and High Performance Speed Control of Rolling Mill Drives," Proc. of the 2nd IEEE International Workshop on Advanced Motion Control (AMC'92), Nagoya, Japan, March 1992, pp. 432-438.

23. Dhaouadi, R., Kubo, K., and Tobise, M., "Robust Speed Control of Rolling Mill Drive Systems Using The Loop Transfer Recovery Design Methodology," Proc. of the 1991 IEEE International Conference on Industrial Electronics, Control and Instrumentation, Annual Meeting, Kobe, Japan, October 1991, Vol. 1, pp. 555-560.

24. Dhaouadi, R., and Mohan, N., "DSP-Based Control of a Permanent Magnet Synchronous Motor With Estimated Speed and Rotor Position," Proc. of the 4th European Conference on Power Electronics and Applications (EPE'91), Florence, Italy, September 1991, Vol. 1, pp. 596-602.

25. Dhaouadi, R., and Mohan, N., "Application of Stochastic Filtering to a Permanent Magnet Synchronous Motor Drive System Without Electromechanical Sensors," Proc. of the International Conference On Electrical Machines, Massachusetts, USA, August 1990, pp. 1225-1230.

26. Dhaouadi, R., Mohan, N., and Norum, L., "Design and Implementation Of An Extended Kalman Filter For The State Estimation Of A Permanent Magnet Synchronous Motor," Proc. of the IEEE Power Electronics Specialists Conference Annual Meeting, San Antonio, Texas, June 1990.

27. Dhaouadi, R., and Mohan, N., "Analysis of Current Regulated Voltage Source Inverters for Permanent Magnet Synchronous Motor Drives," Proc. of the IEEE Power Engineering Society, Summer Meeting, Long Beach, California, August 1989.

PATENTS

Inventor and co-inventor of several control methods for use with motor drives and industrial control systems. These inventions are registered in the following patents:
1. Japan Patent Number: 6-225566, August 12, 1994.
2. United States Patent Number: 5545957, August 13, 1996. Kenji Kubo, Rached Dhaouadi, Masahiro Tobise and Noboru Azusawa, "Motor Speed Controller for Suppressing Shaft Torsion Vibration". Hitachi, Ltd., Japan.