Creep modeling and control methods of piezoelectric actuators based on fractional order theory

Abstract

This paper is focused on the modeling, parameter identification and control strategies of creep phenomenon of piezoelectric actuators. Specifically, a fractional order model is established to characterize the creep behavior. Compared with the traditional creep modeling method like logarithmic model, the fractional order model has faster convergence speed and less steady-state error. Afterwards, a fractional order PI controller is designed for closed-loop control. The simulation results verify the effectiveness of the controller. All above results indicate that fractional order theory can improve the accuracy of creep tracking and prediction of piezoelectric actuators.