Abstract:

The adaptive identification of the non-linear hysteresis and creep effects in piezoelectric actuator is proposed. Model uncertainties related to hysteresis and creep effects in piezoelectric actuators, most prominently in high frequency zone (above 50 Hz), can make the closed-loop control system unstable. Furthermore it may lead to inaccurate open-loop control frequently causing harmonic distortion when piezoelectric actuator is driven with sinusoidal input voltage signal. In order to solve the above issues, it is very important to determine an accurate non-linear dynamic model of the piezoelectric actuator. An Unscented Kalman Filter (UKF) based adaptive identification algorithm is presented to accurately determine the dynamic model of a piezoelectric stack type actuator such that the non-linear hysteresis and creep effects can be accurately predicted.