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A finite element scheme for acoustic propagation in flexible-walled ducts with bulk-reacting liners, and comparison with experiment

A finite element scheme for acoustic propagation in flexible-walled ducts with bulk-reacting liners, and comparison with experiment
A finite element scheme for acoustic propagation in flexible-walled ducts with bulk-reacting liners, and comparison with experiment
The effects of wall flexibility on the propagation of acoustical and structural waves in ducts lined with bulk-reacting sound-absorbing material is studied both theoretically and experimentally. The theoretical treatment involves the use of a coupled finite element model for the airway, liner and flexible wall. Coupled eigenmodes in the duct are determined and a composite solution is obtained, by the use of modal superposition, for the sound field in the vicinity of a transition from a rigid to a flexible-walled segment. Analogous experimental data are presented for the sound pressure level inside a simple test duct of rectangular cross-section with a flexible wall. The wall displacement is also measured, and good agreement is obtained between theoretical and measured results. Both indicate significant increases in sound absorption within the duct—compared with that in a rigid-walled duct—in the vicinity of “cut-on” frequencies for the axial structural modes in the duct wall. Some parametric studies of this effect are also presented.

0022-460X
119-138
Astley, R.J.
cb7fed9f-a96a-4b58-8939-6db1010f9893
Cummings, A.
1a1fff5a-2b19-42e4-8c67-ffa0433befd6
Sormaz, N.
fcc9187b-6412-4486-b38e-47b5b5c90bb8
Astley, R.J.
cb7fed9f-a96a-4b58-8939-6db1010f9893
Cummings, A.
1a1fff5a-2b19-42e4-8c67-ffa0433befd6
Sormaz, N.
fcc9187b-6412-4486-b38e-47b5b5c90bb8

Astley, R.J., Cummings, A. and Sormaz, N. (1991) A finite element scheme for acoustic propagation in flexible-walled ducts with bulk-reacting liners, and comparison with experiment. Journal of Sound and Vibration, 150 (1), 119-138. (doi:10.1016/0022-460X(91)90406-A).

Record type: Article

Abstract

The effects of wall flexibility on the propagation of acoustical and structural waves in ducts lined with bulk-reacting sound-absorbing material is studied both theoretically and experimentally. The theoretical treatment involves the use of a coupled finite element model for the airway, liner and flexible wall. Coupled eigenmodes in the duct are determined and a composite solution is obtained, by the use of modal superposition, for the sound field in the vicinity of a transition from a rigid to a flexible-walled segment. Analogous experimental data are presented for the sound pressure level inside a simple test duct of rectangular cross-section with a flexible wall. The wall displacement is also measured, and good agreement is obtained between theoretical and measured results. Both indicate significant increases in sound absorption within the duct—compared with that in a rigid-walled duct—in the vicinity of “cut-on” frequencies for the axial structural modes in the duct wall. Some parametric studies of this effect are also presented.

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Published date: 8 October 1991

Identifiers

Local EPrints ID: 166489
URI: http://eprints.soton.ac.uk/id/eprint/166489
ISSN: 0022-460X
PURE UUID: 528863f8-91e2-41e8-9192-096e8a32ba48

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Date deposited: 29 Oct 2010 07:59
Last modified: 14 Mar 2024 02:13

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Contributors

Author: R.J. Astley
Author: A. Cummings
Author: N. Sormaz

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