Dynamic model and parameters identification of piezoelectric stack actuators

Based on the constitutive equations of piezoelectric materials, the dynamic model of the piezoelectric stack actuators is derived. Subsequently, experimental setup for the dynamic characteristics measurement is established. Parameters such as voltage-displacement coefficient, stiffness and damping constant are identified from the experimental results by the principle of piezoelectric effect and classic automatic control theory. The effectiveness of the identification results is then verified through comparing the experimental and simulation results of step response. In addition, the influences of different parameters on the dynamic characteristics of the actuators are investigated by MATLAB simulation, which provides a basis for the piezoelectric stack actuators design and selection in practical applications. Finally, the dynamic model is applied to the analysis of the hybrid vibration isolator.