A Dynamic Hysteresis Model of Piezoelectric Ceramic Actuators

A modified Prandtl-Ishlinskii (PI) model with rate-dependent thresholds for describing the hysteresis characteristics of piezoelectric actuators is proposed. Based on the classical PI model, a novel threshold depending on the input rate is constructed. With the novel rate-dependent threshold, the play operator has the capability to track the frequency variation of the input signal. Hence, the proposed modified PI model can be used to depict the rate-dependent hysteresis of piezoelectric actuators. Experimental results are presented to illustrate the model validation results of the proposed modeling.