Performance and stability properties of a smart double panel with decentralized active dampers

Alujević, Neven and Gardonio, Paolo (2006) Performance and stability properties of a smart double panel with decentralized active dampers. 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 a theoretical study of active damping on a double panel vibroacoustic system. The system consists of two vibrating panels, which are structurally and acoustically coupled via elastic mounts and the air in the cavity between the panels. The “source” panel is excited by an acoustic plane wave, while the “radiating” panel radiates sound into free-field. An array of sixteen reactive actuators is located in the air cavity, in order to implement direct velocity feedback (DVFB) decentralized control loops. The aim is to generate active damping across the two panels so that the low frequency resonant sound transmission is reduced. It has been shown previously that collocated DVFB with idealized skyhook force actuators generates active damping on structures and is unconditionally stable. However, when reactive actuators are used, performance and stability of the system may be affected by a feed-through effect via the mounting system or the air in the cavity. A mathematical model for the problem has been developed, which considers the fully coupled configuration. Simulations with various feedback arrangements have been performed, and the results discussed, focusing particularly on the control system performance and stability.

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