PAN Jinbo, HE Jilin, WU Nanxing, HUANG Zhicheng

(School of Mechanical and Electronic Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China)

Abstract: Flexible structures are prone to vibrate when subject to external excitation forces, which in turn has a negative effecton their working stability. It will lead to instability or even failure of components in severe cases. Therefore, it is necessary tocontrol such vibrations. Active vibration control of flexible structures using piezoelectric ceramics is a promising method.Taking piezoelectric flexible beams under three different boundary conditions as the research object, based on the smalldeformation hypothesis and Hamilton principle, a finite element dynamic model of the piezoelectric flexible beam isestablished and verified. Then, the corresponding state space equation according to the dynamic equation is derived. Throughnumerical simulation, the influence of the position and thickness of the piezoelectric sheet on the control effect is explored.Finally, two commonly used control laws are optimized.
Key words: piezoelectric ceramics; flexible structure; active vibration control; finite element method