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Model for active control of flow-induced noise transmitted through double partitions

Model for active control of flow-induced noise transmitted through double partitions
Model for active control of flow-induced noise transmitted through double partitions
The results are presented of a study concerned with the prediction of the airflow noise transmitted through an element of the fuselage structure: a doublepanel of finite extent that consists of a pair of thin elastic plates containing a light insulating material separated from the inner skin by an air gap. This configuration is representative of typical compound sidewalls in large commercial aircraft.
A solution based on modal coupling is obtained and validated by comparisons with other solutions on various test cases. A physical interpretation is given for the calculated vibroacoustic response of a double partition system excited by a turbulent boundary layer, and the effect of an air gap between the insulation facing bag and the trim panel is analyzed. It is shown that the levels of the inwardly radiated sound power are mainly determined by the contribution of the first skin panel-controlled mode, and the added damping effect due to the insulating material has little effect below this resonance.
To achieve sound reduction in the very low-frequency domain, the performance of various active control strategies are examined and compared. It is found that the most efficient strategy is the suppression of the low-order skin panel structural modes. However, we note that significant reductions in the sound power radiated can also be achieved by the active suppression of the low-order structural modes of the trim panel.
0001-1452
1113-1121
Maury, Cedric
2b75baa9-5aa9-47a1-9118-8fb2a5ab04c5
Gardonio, Paolo
bae5bf72-ea81-43a6-a756-d7153d2de77a
Elliott, Stephen John
721dc55c-8c3e-4895-b9c4-82f62abd3567
Maury, Cedric
2b75baa9-5aa9-47a1-9118-8fb2a5ab04c5
Gardonio, Paolo
bae5bf72-ea81-43a6-a756-d7153d2de77a
Elliott, Stephen John
721dc55c-8c3e-4895-b9c4-82f62abd3567

Maury, Cedric, Gardonio, Paolo and Elliott, Stephen John (2002) Model for active control of flow-induced noise transmitted through double partitions. AIAA Journal, 40 (6), 1113-1121.

Record type: Article

Abstract

The results are presented of a study concerned with the prediction of the airflow noise transmitted through an element of the fuselage structure: a doublepanel of finite extent that consists of a pair of thin elastic plates containing a light insulating material separated from the inner skin by an air gap. This configuration is representative of typical compound sidewalls in large commercial aircraft.
A solution based on modal coupling is obtained and validated by comparisons with other solutions on various test cases. A physical interpretation is given for the calculated vibroacoustic response of a double partition system excited by a turbulent boundary layer, and the effect of an air gap between the insulation facing bag and the trim panel is analyzed. It is shown that the levels of the inwardly radiated sound power are mainly determined by the contribution of the first skin panel-controlled mode, and the added damping effect due to the insulating material has little effect below this resonance.
To achieve sound reduction in the very low-frequency domain, the performance of various active control strategies are examined and compared. It is found that the most efficient strategy is the suppression of the low-order skin panel structural modes. However, we note that significant reductions in the sound power radiated can also be achieved by the active suppression of the low-order structural modes of the trim panel.

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Published date: June 2002

Identifiers

Local EPrints ID: 28377
URI: http://eprints.soton.ac.uk/id/eprint/28377
ISSN: 0001-1452
PURE UUID: 909b472e-51d3-4feb-95e7-0c621d382811

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Date deposited: 03 May 2006
Last modified: 08 Jan 2022 18:55

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Contributors

Author: Cedric Maury
Author: Paolo Gardonio

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