https://eecs.ucmerced.edu/public/seminars/spring-2013/2013-02-01
EECS Seminar by Dr. YangQuan Chen
Detection, Identification and Compensation of Nonlinearities and An Experimental Verification Platform for Nonlinear Controllers
YangQuan Chen, Assistant Professor of Mechanical Engineering and Electrical Engineering and Computer Science, School of Engineering, University of California Merced
Abstract:
In practice, static nonlinearities in a control loop or a signal channel need to be characterized and compensated, if needed, for better performance. Identification of nonlinear systems has been an active research area for more than one decade. But compensation of nonlinearity has not received much attention. In this talk, we investigate the problem of nonlinearity compensation in closed-loop systems from a holistic point of view. First, the effect of nonlinear distortions on closed-loop performance of systems is presented. Next, new nonlinearity models for identification of Wiener and Hammerstein systems are presented with the objective of canceling the effect of nonlinear distortions. Use of hyperbolic splines toward the compensation of static sensor nonlinearities is also explained. We also demonstrate a platform for experimental verification of nonlinear control algorithms. Development of a fractional horsepower dynamometer is described for this purpose and experimental results are shown for five different nonlinear control schemes, namely, state-periodic adaptive control, adaptive friction compensation, adaptive feedforward cancelation, repetitive control, and sliding mode control.
Biography:
YangQuan Chen was a faculty member of ECE Dept. of Utah State University before he joined UC Merced in Fall 2012. He earned his Ph.D. from Nanyang Technological University, Singapore in 1998, MSc. from Beijing Institute of Technology in 1989 and BS. from University of Science and Technology of Beijing in 1985. His current areas of research interests include: distributed measurement and distributed control of distributed parameter systems using mobile actuator and sensor networks, smart mechatronics and process controls, applied fractional calculus in controls, signal processing and energy informatics, multi-UAV based personal cooperative remote sensing and real time water management and irrigation control. Dr. Chen is an Associate Editor on the Conference Editorial Board of the Control Systems Society of the IEEE (since 2002), an Associate Editor on the International Society of Automation (ISA) Editorial Board for the American Control Conference (since 2004) and an Associate Editor on the Conference Editorial Board of the Robotics and Automation Society of the IEEE (since 2012). Dr. Chen is a senior member of IEEE, a member of ASME, AUVSI, AMA (Academy of Model Aeronautics), AWRA (American Water Resources Association) and ASEE (American Society of Engineering Educators).
