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The effect of external mean flow on sound transmission through double-walled cylindrical shells lined with poroelastic material

The effect of external mean flow on sound transmission through double-walled cylindrical shells lined with poroelastic material
The effect of external mean flow on sound transmission through double-walled cylindrical shells lined with poroelastic material
Sound transmission through a system of double shells, lined with poroelastic material in the presence of external mean flow, is studied. The porous material is modeled as an equivalent fluid because shear wave contributions are known to be insignificant. This is achieved by accounting for the energetically most dominant wave types in the calculations. The transmission characteristics of the sandwich construction are presented for different incidence angles and Mach numbers over a wide frequency range. It is noted that the transmission loss exhibits three dips on the frequency axis as opposed to flat panels where there are only two such frequencies—results are discussed in the light of these observations. Flow is shown to decrease the transmission loss below the ring frequency, but increase this above the ring frequency due to the negative stiffness and the damping effect added by the flow. In the absence of external mean flow, porous material provides superior insulation for most part of the frequency band of interest. However, in the presence of external flow, this is true only below the ring frequency—above this frequency, the presence of air gap in sandwich constructions is the dominant factor that determines the acoustic performance. In the absence of external flow, an air gap always improves sound insulation
0022-460X
1972-1990
Zhou, Jie
ea4ca5fc-7c95-4b68-824a-b16792fee77a
Bhaskar, Atul
d4122e7c-5bf3-415f-9846-5b0fed645f3e
Zhang, Xin
788d80a9-6117-4670-81ef-f8ef2d26d30c
Zhou, Jie
ea4ca5fc-7c95-4b68-824a-b16792fee77a
Bhaskar, Atul
d4122e7c-5bf3-415f-9846-5b0fed645f3e
Zhang, Xin
788d80a9-6117-4670-81ef-f8ef2d26d30c

Zhou, Jie, Bhaskar, Atul and Zhang, Xin (2014) The effect of external mean flow on sound transmission through double-walled cylindrical shells lined with poroelastic material. Journal of Sound and Vibration, 333 (7), 1972-1990. (doi:10.1016/j.jsv.2013.11.038).

Record type: Article

Abstract

Sound transmission through a system of double shells, lined with poroelastic material in the presence of external mean flow, is studied. The porous material is modeled as an equivalent fluid because shear wave contributions are known to be insignificant. This is achieved by accounting for the energetically most dominant wave types in the calculations. The transmission characteristics of the sandwich construction are presented for different incidence angles and Mach numbers over a wide frequency range. It is noted that the transmission loss exhibits three dips on the frequency axis as opposed to flat panels where there are only two such frequencies—results are discussed in the light of these observations. Flow is shown to decrease the transmission loss below the ring frequency, but increase this above the ring frequency due to the negative stiffness and the damping effect added by the flow. In the absence of external mean flow, porous material provides superior insulation for most part of the frequency band of interest. However, in the presence of external flow, this is true only below the ring frequency—above this frequency, the presence of air gap in sandwich constructions is the dominant factor that determines the acoustic performance. In the absence of external flow, an air gap always improves sound insulation

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More information

Accepted/In Press date: 26 November 2013
e-pub ahead of print date: 30 December 2013
Published date: 31 March 2014
Organisations: Aeronautics, Astronautics & Comp. Eng, Computational Engineering & Design Group

Identifiers

Local EPrints ID: 381978
URI: http://eprints.soton.ac.uk/id/eprint/381978
ISSN: 0022-460X
PURE UUID: 9373b80d-ddfd-4be5-96de-b2b96c4f5b1c

Catalogue record

Date deposited: 16 Oct 2015 14:23
Last modified: 01 Aug 2018 16:31

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Contributors

Author: Jie Zhou
Author: Atul Bhaskar
Author: Xin Zhang

University divisions

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