ACTIVE VIBRATION CONTROL OF COMPOSITE BEAMS WITH PIEZOELECTRICS - A FINITE-ELEMENT MODEL WITH 3RD-ORDER THEORY

A finite element model based on third order laminate theory is develop ed for the active position control and vibration control of composite beams with distributed peizoelectric sensors and actuators. The direct peizoelectric equation is used to calculate the total charge created by the strains on the sensor electrodes; and the actuators provide a d amping effect on the composite beam by coupling a negative velocity fe edback control algorithm in a closed control loop. The shape control a nd active vibration suppression of a cantilever composite beam are per formed to verify the proposed model. A modal superposition technique a nd the Newmark-beta method are used in the numerical analysis to compu te the dynamic response of composite beams. Finally, the effects of th e number and locations of the sensors/actuators on the control system are also investigated. (C) 1998 Academic Press Limited.