MODELING OF A HYBRID CONSTRAINED LAYER PIEZOCERAMIC APPROACH TO ACTIVE DAMPING/

It has been shown that significant reductions in structural vibration levels can be achieved using a hybrid system involving constrained lay er damping and active control with piezoceramics. In this paper mathem atical models based on the Rayleigh Ritz approach, are developed to de scribe the longitudinal and flexural vibration behaviour of a cantilev ered beam when excited using piezoceramic patches bonded to a constrai ned layer damping treatment. Predictions of static and steady state dy namic behaviour, obtained using the models are validated by comparison with results from finite element analysis and laboratory experiments. The models are then used in open loop and closed loop velocity feedba ck control simulations to demonstrate the improvements in stability an d performance achieved using this method over that achieved using conv entional active control.