A Dynamic Model of Stick-Slip Piezoelectric Actuators Considering the Deformation of Overall System

Aiming to simulate the experimentally observed three kinds of one-stepping characteristics in stick-slip piezoelectric actuators, i.e., backward motion, smooth motion, and sudden jump, a new dynamic model is proposed with consideration of the deformation of overall system. Being different from the existing dynamic models that consider the overall system as a rigid body, the stiffness coefficient and damping coefficient of the overall system are introduced in the newly proposed model. By adjusting the parameters according to the experimental conditions, these three kinds of characteristics are successfully simulated for the first time in this field. By comparison with the existing dynamic models of stick-slip piezoelectric actuators, the effectiveness, advancement, and necessity of the proposed dynamic model are demonstrated. This model is expected to be helpful for the structure design and performance prediction of stick-slip piezoelectric actuators.