Active suppression of plate vibration with piezoceramic actuators/sensors using multiple adaptive feedforward with feedback loop control algorithm

摘要

Abstract: This paper presents a methodology to suppress thevibration of thin rectangular plate clamped all edges.Intelligent materials such as the piezoelectric ceramicare used as actuators and sensors. The experimentalmodeling technique, i.e., the state-space frequencydomain identification, is introduced to model thecomplex shaped structures bonded with noncollocatedactuators/sensors. This method is much free from theMulti-Input Multi-Output (MIMO) model order problemcaused at the digital implementation and also reducesdistortion of the signal. In control scheme, theadaptive feedforward with feedback control algorithm isadopted since it is robust for both the transient andpersistent external disturbances. The adaptivefeedforward control uses the well known Multiplefiltered-x LMS (least mean square) algorithm. The MIMOerror path dynamics is controlled by the feedback loopwhich is constructed by multivariable digital LQG(Linear Quadratic Gaussian) controller composed of theregulator and Kalman filter. Experiment resultsdemonstrate the effective reduction of the vibrationlabel and the robustness for both the transient andpersistent external disturbances. !19