Effects of piezoelectric sensor/actuator debonding on vibration control ofsmart beams

In vibration control of smart structures, piezoelectric sensors/actuators a re usually bonded to the surface of a host structure. Debonding may occur b etween the piezoelectric sensors/actuators and the host structure, and it m ay decrease the control efficiency of vibration suppression or even lead to an unstable closed loop control system. This paper investigates the effect of the debonding on vibration control of beams with piezoelectric sensors and actuators. Presented is a novel model, which takes into account both Fl exural and longitudinal displacements of the host beam and piezoelectric la yers as well as the peel and shear strains of the adhesive layer. Both coll ocated and non-collocated control schemes are used to study the effects of sensor or actuator debonding on active vibration control of smart beams. (C ) 2001 Elsevier Science Ltd. All rights reserved.