<title>Comparison of low-frequency piezoceramic shunt techniques for structural damping</title>

Abstract

In this paper, the performances of two novel low frequency piezoceramic shunt techniques for structural damping are compared to the traditional passive tuned resonant shunt circuit techinque. The first novel technique, state switching, is a semi-active variable stiffness technique in which bonded piezoceramic actuators are switched from the short circuit to open circuit states. This technique changes the stiffness of the structure for two quarters of its vibration period, thus dissipating energy. The second novel technique, synchronized switching, is a semi-active continuous switching technique in which a resistor/inductor shunt circuit is periodically connected to the bonded piezoceramic actuators. This technique applies charges to the piezoceramic actuators in a manner similar to the Direct Velocity Feedback and Bang-Bang time optimal control techniques. A brief description of each of the damping techniques is given. Numerical simulations of the switching techniques are shown and compared to the resonant shunt damping technique. Finally, preliminary experimental results are presented for the resonant shunt, state, and synchronized switching techniques on a simply supported beam.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.