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Active vibro-acoustic control with multiple local feedback loops

Active vibro-acoustic control with multiple local feedback loops
Active vibro-acoustic control with multiple local feedback loops
The active control of a structure in order to reduce its vibration or sound radiation, which may be termed active vibro-acoustic control, has previously been achieved with multiple actuators and sensors and fully-coupled feedforward or feedback controllers. In this paper local velocity feedback using multiple miniature accelerometers will be investigated, together with either collocated force actuators or piezoceramic actuators placed under each sensor. With ideal force actuators, the plant response is passive for such an arrangement of collocated actuator/sensor pairs and so decentralized (local) feedback is guaranteed stable. This property is shown to extend to collocated velocity sensors and piezoceramic actuators over the bandwidth of interest and so multiple local feedback loops are also predicted to be stable. The performance of such a system is simulated in controlling the vibration and sound transmission through a thin plate, excited by an acoustic plane wave, with a 4 x 4 array of such actuator/sensor pairs, which are connected together with 16 local feedback control loops. Using force actuators, significant frequency-averaged reductions up to 1kHz in both the kinetic energy (28dB) and transmitted sound power (18dB) can be obtained with an appropriate feedback gain in each loop. These reductions are not so great with piezoelectric actuators (12dB and 9dB respectively) but their use allows the controller to be fully integrated in the structure.
720-731
SPIE - The International Society for Optical Engineering
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Gardonio, P.
bae5bf72-ea81-43a6-a756-d7153d2de77a
Sors, T.C.
f25dcad7-b333-4f40-bca9-4ee270668a60
Brennan, M.J.
87c7bca3-a9e5-46aa-9153-34c712355a13
Davis, L. Porter
Elliott, S.J.
721dc55c-8c3e-4895-b9c4-82f62abd3567
Gardonio, P.
bae5bf72-ea81-43a6-a756-d7153d2de77a
Sors, T.C.
f25dcad7-b333-4f40-bca9-4ee270668a60
Brennan, M.J.
87c7bca3-a9e5-46aa-9153-34c712355a13
Davis, L. Porter

Elliott, S.J., Gardonio, P., Sors, T.C. and Brennan, M.J. (2001) Active vibro-acoustic control with multiple local feedback loops. Davis, L. Porter (ed.) In Proceedings of SPIE Smart Structures and Materials 2001: Smart Structures and Integrated Systems. SPIE - The International Society for Optical Engineering. pp. 720-731 . (doi:10.1117/12.436579).

Record type: Conference or Workshop Item (Paper)

Abstract

The active control of a structure in order to reduce its vibration or sound radiation, which may be termed active vibro-acoustic control, has previously been achieved with multiple actuators and sensors and fully-coupled feedforward or feedback controllers. In this paper local velocity feedback using multiple miniature accelerometers will be investigated, together with either collocated force actuators or piezoceramic actuators placed under each sensor. With ideal force actuators, the plant response is passive for such an arrangement of collocated actuator/sensor pairs and so decentralized (local) feedback is guaranteed stable. This property is shown to extend to collocated velocity sensors and piezoceramic actuators over the bandwidth of interest and so multiple local feedback loops are also predicted to be stable. The performance of such a system is simulated in controlling the vibration and sound transmission through a thin plate, excited by an acoustic plane wave, with a 4 x 4 array of such actuator/sensor pairs, which are connected together with 16 local feedback control loops. Using force actuators, significant frequency-averaged reductions up to 1kHz in both the kinetic energy (28dB) and transmitted sound power (18dB) can be obtained with an appropriate feedback gain in each loop. These reductions are not so great with piezoelectric actuators (12dB and 9dB respectively) but their use allows the controller to be fully integrated in the structure.

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More information

Published date: 2001
Additional Information: Conference 4327
Venue - Dates: SPIE Smart Structures and Materials 2001: Smart Structures and Integrated Systems, 2001-03-05 - 2001-03-08

Identifiers

Local EPrints ID: 10831
URI: https://eprints.soton.ac.uk/id/eprint/10831
PURE UUID: bdf4c816-1d71-49e0-a4cd-786967273695

Catalogue record

Date deposited: 22 Aug 2005
Last modified: 15 Jul 2019 19:36

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