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Active control of harmonic sound transmission into an acoustic enclosure using both structural and acoustic actuators

Active control of harmonic sound transmission into an acoustic enclosure using both structural and acoustic actuators
Active control of harmonic sound transmission into an acoustic enclosure using both structural and acoustic actuators
This paper describes an analytical and experimental investigation into the active control of harmonic sound transmission in a structural–acoustic coupled system. A rectangular enclosure is considered that has five acoustically rigid walls and a flexible plate on the remaining side through which a harmonic sound wave is transmitted into the enclosure. The control system is designed to globally reduce the sound field inside the enclosure, and the roles of structural and acoustic actuators are of particular interest. Three control configurations, classified by the type of actuators, are compared and discussed. They are: (i) use of a single point-force actuator, (ii) use of a single acoustic piston source, and (iii) simultaneous use of both a point-force actuator and an acoustic piston source. It is shown both analytically and experimentally that the point-force actuator is effective in controlling plate-dominated modes while the acoustic source is effective in controlling cavity-dominated modes. Since the transmitted sound field is governed by both plate- and cavity-dominated modes, the hybrid use of both types of actuators is shown to be a desirable configuration for the active control of sound transmission into a structural–acoustic coupled system.
0001-4966
2523-2534
Kim, S.-M.
4ae49beb-ec11-4593-9ae9-1e78277a2e73
Brennan, M.J.
7f39b4f4-810d-49d5-be90-1656c7b8069a
Kim, S.-M.
4ae49beb-ec11-4593-9ae9-1e78277a2e73
Brennan, M.J.
7f39b4f4-810d-49d5-be90-1656c7b8069a

Kim, S.-M. and Brennan, M.J. (2000) Active control of harmonic sound transmission into an acoustic enclosure using both structural and acoustic actuators. Journal of the Acoustical Society of America, 107 (5, Part 1), 2523-2534.

Record type: Article

Abstract

This paper describes an analytical and experimental investigation into the active control of harmonic sound transmission in a structural–acoustic coupled system. A rectangular enclosure is considered that has five acoustically rigid walls and a flexible plate on the remaining side through which a harmonic sound wave is transmitted into the enclosure. The control system is designed to globally reduce the sound field inside the enclosure, and the roles of structural and acoustic actuators are of particular interest. Three control configurations, classified by the type of actuators, are compared and discussed. They are: (i) use of a single point-force actuator, (ii) use of a single acoustic piston source, and (iii) simultaneous use of both a point-force actuator and an acoustic piston source. It is shown both analytically and experimentally that the point-force actuator is effective in controlling plate-dominated modes while the acoustic source is effective in controlling cavity-dominated modes. Since the transmitted sound field is governed by both plate- and cavity-dominated modes, the hybrid use of both types of actuators is shown to be a desirable configuration for the active control of sound transmission into a structural–acoustic coupled system.

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Published date: 2000

Identifiers

Local EPrints ID: 9908
URI: http://eprints.soton.ac.uk/id/eprint/9908
ISSN: 0001-4966
PURE UUID: 61ead668-445d-4a2a-a600-658a91e66590

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Date deposited: 27 Oct 2004
Last modified: 08 Jan 2022 12:47

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Contributors

Author: S.-M. Kim
Author: M.J. Brennan

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