Torsional vibration control by active piezoelectric system

The basic electromechanical properties of piezoelectric material-lead zir-conate titatnate (PZT) are mentioned in the paper in terms of their usability to damp torsional vibration of shafts. Piezoceramics exhibit natural shear effect being three times as much as the longitudinal one. This phenomenon can successfully be utilized in torsional systems for vibration control as piezoceramics constitute perfect elements for actuator applications. Active control is achieved through closed loop with proportional and velocity feedback. The objective of the analysis is to determine the efficiency of electronic damping. The model is developed to include actuator inertia since PZTs possess mass density of level similar to that of steel. Disturbances concomitant with dynamic behaviour of the system due to imperfect actuator bonding to the shaft surface by a glue layer are also taken into account.