Stability and controllability of velocity feedback loops with triangularly shaped piezoelectric actuators

Aoki, Yohko, Emo, Damien, Gardonio, Paolo and Elliott, Stephen J. (2006) Stability and controllability of velocity feedback loops with triangularly shaped piezoelectric actuators. Proceedings of the Sixth International Symposium on Active Noise and Vibration Control, ACTIVE 2006, Adelaide, Australia. 18 - 19 Sep 2006. 13pp .

Abstract

This paper presents theoretical and experimental results on the implementation of decentralised active wedges on a smart panel. The active wedges are made by a triangularly shaped piezoelectric patch actuator, with the base edge aligned along the border of the panel, and a point velocity sensor at the tip of the actuator. In this way the actuator generates bending moments along the lateral edges and a transverse point force at the tip. Thus, when a velocity feedback control loop is implemented, the collocated transverse force excitation and velocity detection produces an active damping effect on the panel. When the panel is equipped with a large set of these control units then good reductions of vibration and sound radiation can be obtained at low frequencies where the response of the panel is controlled by lightly damped resonances of low order modes. The paper is focused on the design and implementation of a single control unit. The stability of the control loop is analysed theoretically with a fully couple model of the sensor, plate and actuator elements of the system. In particular the effects produced by the bending moment and transverse point force actuation components are analysed independently to better understand their effects on the stability and controllability of the feedback control loop. Simulation results have been validated using experimental open loop and close loop measurements taken on a prototype smart panel.

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