Title: Dynamics and Control of Piezoelectric Actuators for High-precision Nano-positioning
Speaker: Dr. Zhi Li, University of Magdeburg, Magdeburg, Germany
Along with the rapid development of nanotechnology, piezoelectric actuators (PEAs) are becoming more and more popular for positioning at nanometer or sub-nanometer levels in many applications, such as atomic force microscopes (AFM), scanning tunneling microscopes, and micro-manipulation. Compared to traditional actuators, PEAs have the advantages of nanometer positioning resolution, high efficiency, and large bandwidth. However, one drawback of PEAs is its input and output nonlinearities, especially hysteresis and creep, which can lead to a positioning error (up to 15% of its travel range) and even instability. For nano-positioning applications, dynamics modeling of nonlinearities and closed-loop control system design are critical. In this talk, Dr. Zhi Li will present his research in the area of dynamics modeling and control system design of piezoelectric actuators for high-precision nano-positioning. This includes dynamics modeling of nonlinearities, the feedforward inverse compensation method, the closed-loop control design, and the application to a Fabry-Perot spectrometer. Dr. Li will also talk about his future research plan in this area.
Dr. Zhi Li received his Ph.D. degree in Mechanical Engineering from Concordia University, Canada, in 2015. He was a Postdoctoral Research Fellow at Eindhoven University of Technology, Netherlands (04.2015-03.2016), and York University, Canada (04.2016-03.2017). Currently, Dr. Li is an Alexander von Humboldt Research Fellow at the University of Magdeburg, Magdeburg, Germany. His research interests include dynamics and control of smart actuators, and soft robotics.
Dr. Li has authored and coauthored more than 30 journal and conference papers. He is the author of 2 book chapters. He was the recipient of the T. J. Tarn’s Best Paper Award on Control Applications at the 11th World Congress on Intelligent Control and Automation, 2014.
Date: Thursday, March 15th, 2018
Time: 2:00 pm
Location: Petrie Science Building, 422