Aeroacoustics of automotive vents
Aeroacoustics of automotive vents
This paper studies the generation of noise by car ventilation systems whose outlet rates are controlled by a butterfly valve and whose directions are controlled by grilles. First the noise created by the valve alone is analysed with the theory formulated by Nelson and Morfey for spoiler-generated noise in-duct flow. To confirm this theory the fluctuating force experienced by the valve is measured experimentally and the mean drag force is deduced from analytical work presented by Sarpkaya. Then the noise generated by the grille and its effect on sound transmission is investigated. Finally, it is shown that a strong and complex interaction between the wake shed behind the valve and the grille occurs when both elements are placed close together. This is responsible for an overall increase in the noise level although some sound reduction is measured at low frequency. It is found that moving the valve further upstream can reduce the noise by several decibels.
car, ventilation, vent noise, aeroacoustics, automotive noise
859-875
Guérin, S.
5d7464f5-8ffe-41e8-8c81-4996bd4be035
Thomy, E.
7cc392d3-1e74-462b-a43c-2c601aa0ac04
Wright, M.C.M.
b7209187-993d-4f18-8003-9f41aaf88abf
6 August 2005
Guérin, S.
5d7464f5-8ffe-41e8-8c81-4996bd4be035
Thomy, E.
7cc392d3-1e74-462b-a43c-2c601aa0ac04
Wright, M.C.M.
b7209187-993d-4f18-8003-9f41aaf88abf
Guérin, S., Thomy, E. and Wright, M.C.M.
(2005)
Aeroacoustics of automotive vents.
Journal of Sound and Vibration, 285 (4-5), .
(doi:10.1016/j.jsv.2004.08.043).
Abstract
This paper studies the generation of noise by car ventilation systems whose outlet rates are controlled by a butterfly valve and whose directions are controlled by grilles. First the noise created by the valve alone is analysed with the theory formulated by Nelson and Morfey for spoiler-generated noise in-duct flow. To confirm this theory the fluctuating force experienced by the valve is measured experimentally and the mean drag force is deduced from analytical work presented by Sarpkaya. Then the noise generated by the grille and its effect on sound transmission is investigated. Finally, it is shown that a strong and complex interaction between the wake shed behind the valve and the grille occurs when both elements are placed close together. This is responsible for an overall increase in the noise level although some sound reduction is measured at low frequency. It is found that moving the valve further upstream can reduce the noise by several decibels.
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Published date: 6 August 2005
Keywords:
car, ventilation, vent noise, aeroacoustics, automotive noise
Identifiers
Local EPrints ID: 28007
URI: http://eprints.soton.ac.uk/id/eprint/28007
ISSN: 0022-460X
PURE UUID: 830fc6aa-770d-4367-b6d2-6c8f8da5a119
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Date deposited: 28 Apr 2006
Last modified: 16 Mar 2024 02:47
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Author:
S. Guérin
Author:
E. Thomy
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