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Assessment of the noise radiation from engine covers

Assessment of the noise radiation from engine covers
Assessment of the noise radiation from engine covers
Lightweight flexible structures, such as valve covers, sumps and front covers, can contribute substantially to the overall radiated sound from an engine. It is important to be able to quantify this. Moreover, the designer is often faced with choices in material, geometry and mounting configurations that have implications for noise radiation. Simple measurement methods are described that can be used to characterise a cover without needing a running engine. These include the determination of the radiation efficiency of a cover and its spatial transmissibility, that is, the average vibration of the cover divided by the average vibration of the underlying structure, which can be used to compare different mounting arrangements as well as cover designs. In addition, simple analytical modelling techniques are described that have been developed to describe the noise radiation from covers. These use a small number of parameters in order to obtain rapid understanding of the general trends.
ENGINE COMPONENTS, NOISE REDUCTION, NOISE VIBRATION HARSHNESS
215-226
Automotive Information Centre, MIRA Ltd
Thompson, D.J.
bca37fd3-d692-4779-b663-5916b01edae5
Grice, R.M.
2dc81cc0-e843-43b4-a326-aae435a01f69
Blaha, R.
06efd6c6-f4d6-4e47-8da2-b975e31fdd8f
Thompson, D.J.
bca37fd3-d692-4779-b663-5916b01edae5
Grice, R.M.
2dc81cc0-e843-43b4-a326-aae435a01f69
Blaha, R.
06efd6c6-f4d6-4e47-8da2-b975e31fdd8f

Thompson, D.J., Grice, R.M. and Blaha, R. (2002) Assessment of the noise radiation from engine covers. In ImechE Conference Transactions; European Conference on Vehicle Noise and Vibration 2002. Automotive Information Centre, MIRA Ltd. pp. 215-226 .

Record type: Conference or Workshop Item (Paper)

Abstract

Lightweight flexible structures, such as valve covers, sumps and front covers, can contribute substantially to the overall radiated sound from an engine. It is important to be able to quantify this. Moreover, the designer is often faced with choices in material, geometry and mounting configurations that have implications for noise radiation. Simple measurement methods are described that can be used to characterise a cover without needing a running engine. These include the determination of the radiation efficiency of a cover and its spatial transmissibility, that is, the average vibration of the cover divided by the average vibration of the underlying structure, which can be used to compare different mounting arrangements as well as cover designs. In addition, simple analytical modelling techniques are described that have been developed to describe the noise radiation from covers. These use a small number of parameters in order to obtain rapid understanding of the general trends.

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More information

Published date: 2002
Additional Information: Powertrain 11JUN2002, p 215 (12 p, 8 fig, 11 ref) Doc No198866, (In ENGLISH)
Venue - Dates: European Conference on Vehicle Noise and Vibration, London, UK, 2002-06-10 - 2002-06-11
Keywords: ENGINE COMPONENTS, NOISE REDUCTION, NOISE VIBRATION HARSHNESS

Identifiers

Local EPrints ID: 10063
URI: http://eprints.soton.ac.uk/id/eprint/10063
PURE UUID: 64ec95c5-20cf-4468-b451-5e9aae8d4992
ORCID for D.J. Thompson: ORCID iD orcid.org/0000-0002-7964-5906

Catalogue record

Date deposited: 22 Sep 2005
Last modified: 22 Apr 2020 00:26

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Contributors

Author: D.J. Thompson ORCID iD
Author: R.M. Grice
Author: R. Blaha

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