Dynamic Hysteresis Based Modeling Of Piezoelectric Actuators30 Mar 2014 00:00
Piezoelectric actuators are popularly applied as actuators in high precision systems due to their small displacement resolution, fast response and simple construction. However, the hysteresis nonlinear behavior limits the dynamic modeling and tracking control of piezoelectric actuators. This paper studies a dynamic model of a moving stage driven by piezoelectric stack actuator. The Bouc-Wen model is introduced and analyzed to express the nonlinear hysteresis term. Two triangular actuating voltages with frequency of 1 Hz and amplitudes of 80 V and 90 V are applied to drive the piezoelectric stack actuator. The results demonstrate the existence of the hysteresis phenomenon between the input voltage and the output displacement of the piezoelectric stack actuator, and validate the correctness of the model.
Piezoelectric actuators are widely used for micro/nano manipulation systems, micro-robots, vibration active control, precision machining, and atomic force microscopy. This is due to their special characteristics such as high resolution in nanometer range, fast response, and high stiffness. However, the main disadvantage of piezoelectric actuators is the nonlinearity, that mainly due to hysteresis behavior that occurs between the applied voltage and output displacement, which causes difficulties in controlling the displacement of the actuator. Therefore, an accurate modeling of hysteresis behavior should be implemented in order to design a controller for hysteresis compensation of the piezoelectric actuators. This paper studies the dynamic hysteresis modeling of piezoelectric actuators that is based on Bouc-Wen hysteresis model.