Smart panel with decentralised inertial actuator active damping units

Diaz, Cristóbal Gonzalez, Gardonio, Paolo and Paulitsch, Christoph (2006) Smart panel with decentralised inertial actuator active damping units. Proceedings of the Sixth International Symposium on Active Noise and Vibration Control, ACTIVE 2006, Adelaide, Australia. 18 - 19 Sep 2006. 14 pp .

Abstract

This paper presents a study of decentralised velocity feedback control on a rectangular panel using five electrodynamic inertial actuators. The aim is to generate active damping in such a way as to control the low-frequency lightly damped resonances of the panel and thus reduce the sound radiation. It has been shown that collocated direct velocity feedback (DVFB) with ideal point force actuators mounted on a structure generates active damping and is unconditionally stable. However, when an inertial electrodynamic actuator is used to implement velocity feedback control, the fundamental resonance frequencies of the actuator determine stability and control bandwidth limits. In this paper the design of a small scale inertial actuator with a low mounting resonance frequency is first presented. The main design issues related to the stability of a velocity feedback control loop are discussed. The simultaneous implementation of five control units is then studied. The stability of the five control systems is assessed with reference to the locus of the eigenvalues of the 5x5 fully populated matrix with the open loop frequency response functions between the sensors and actuators. Finally the control performance both in terms of vibration reduction and radiated sound is presented.

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