Active control of flexural power flow in beams using piezoceramic actuators

Abstract

Previous research has demonstrated that the flexural power flow in thin beams can be attenuated using active point force inputs [C. R. Fuller and L. O. Gonidou, “Active vibration control of flexural power flow in beams,” J. Acoust. Soc. Am. Suppl. 1 84, S47 (1988)]. In this paper, the results of experiments that demonstrate the feasibility of using surface‐bonded piezoceramic actuators and sensors in controlling vibrational power flow in elastic structures are presented. The control system utilizes both a piezoceramic control actuator and sensor, and a time domain least‐mean‐squares adaptive algorithm to minimize transmitted power flow. Both semi‐infinite and finite beams of various geometries are considered, and the results show significant reduction of vibrational power flow using only a single piezoceramic transducer as the control actuator. [Work supported by NASA Langley Research Center.]