Dynamic Modeling and Control System Design for a Piezoelectric Actuator based Nanopositioning System

The two years research project of Dr. Ryan Orszulik, financially supported by an Alexander von Humboldt Fellowship, is carried out in collaboration with Prof. Gabbert from the Otto-von-Guericke University of Magdeburg, and Prof. Monner of the DLR Braunschweig. During the last decade piezoelectric actuators have drawn considerable attention from the research community.But the development of accurate nonlinear models, specially a rate-dependent one, that is valid over a range of operating conditions is still an open problem. The limiting effect of the actuators performance is due to the asymmetrical and rate-dependent nature of the hysteresis effect. In the focus of the research project is the development of a nonlinear controller for the actuator, that can guarantee stability of the system in the presence of the hysteresis nonlinearity, is still necessary for highly precise positioning of the actuator over a large bandwidth.