Comparison Analysis of Piezoelectric Vibration Control Methods for Autobody Thin-Wall Structure

Abstract

The piezoelectric materials have the positive and inverse piezoelectric effects. The piezoelectric elements can be served as actuators and sensors. The piezoelectric elements are adopted to control the vibration of autobody thin-wall structure. The proportional control, proportional-derivative control and independent modal space control based on LQR (Linear Quadratic Regulator) are simulated by using finite element method. The piezoelectric patched autobody thin-wall structure is simplified to a square plate with peripheral clamped boundary. The finite element model is established. The central node displacement is monitored as a control variable in these control methods. Central patched plate and surrounding patched plate are analyzed under the three control methods. The effectiveness of vibration control is obtained. Compared with proportional control, the proportional-derivative control has advantage of oscillation suppression at the beginning vibration control and has more obvious vibration control effectiveness. Compared with the above two control methods, the independent modal space control based on LQR has a better stability and vibration suppression effectiveness.