Modeling and control of a piezostack actuator considering dynamic hysteresis

초록

This paper proposes a compensator for the dynamic hysteresis of a piezostack actuator. It consists of two components: a rate-independent hysteresis compensator and a nonlinear filter. The compensator is formulated based on a novel rate-independent hysteresis model, whereas the filter is obtained adaptively using the recursive least square algorithm. In order to demonstrate the effectiveness of the proposed model, control performances are experimentally evaluated in time domain with different input voltage waveforms: fixed-frequency and varying-frequency sinusoidal waveforms. Moreover, a comparison between the dynamic model and the rate-independent one is undertaken. It is shown that the proposed dynamic model can provide much better accuracy than the rate-independent one. © 2011 SPIE.