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Implications of the directivity of railway noise sources for their quantification using conventional beamforming

Implications of the directivity of railway noise sources for their quantification using conventional beamforming
Implications of the directivity of railway noise sources for their quantification using conventional beamforming

This paper investigates the effect of the directivity of railway noise sources on the results of an identification procedure based on beamforming using a microphone array. Usually when performing pass-by noise tests, a single-microphone noise spectrum is obtained for a time window corresponding to the length of the whole train, or of a single vehicle. In this context, a source quantification algorithm should be able to evaluate the contribution of each noise source over this time window. However, different railway noise sources have different directivities, and it is shown that these need to be taken into account to achieve accurate source quantification. By making use of monopoles, dipoles and quadrupoles, it is shown that a different compensation is needed according to the directivity. For the particular case of the noise radiated by the rail, this has a complex directivity pattern that is only partially captured by a microphone array. It is demonstrated that the overestimation of the wheel contribution found in previous research may be attributed to a misinterpretation of part of the rail contribution from the beamforming map.

Beamforming, Directivity, Railway noise, Source quantification
0022-460X
1-23
Zhang, Jin
4cb1ed20-f74c-4b0c-a3aa-29761b0640b7
Squicciarini, Giacomo
c1bdd1f6-a2e8-435c-a924-3e052d3d191e
Thompson, David J.
bca37fd3-d692-4779-b663-5916b01edae5
Zhang, Jin
4cb1ed20-f74c-4b0c-a3aa-29761b0640b7
Squicciarini, Giacomo
c1bdd1f6-a2e8-435c-a924-3e052d3d191e
Thompson, David J.
bca37fd3-d692-4779-b663-5916b01edae5

Zhang, Jin, Squicciarini, Giacomo and Thompson, David J. (2019) Implications of the directivity of railway noise sources for their quantification using conventional beamforming. Journal of Sound and Vibration, 459, 1-23, [114841]. (doi:10.1016/j.jsv.2019.07.007).

Record type: Article

Abstract

This paper investigates the effect of the directivity of railway noise sources on the results of an identification procedure based on beamforming using a microphone array. Usually when performing pass-by noise tests, a single-microphone noise spectrum is obtained for a time window corresponding to the length of the whole train, or of a single vehicle. In this context, a source quantification algorithm should be able to evaluate the contribution of each noise source over this time window. However, different railway noise sources have different directivities, and it is shown that these need to be taken into account to achieve accurate source quantification. By making use of monopoles, dipoles and quadrupoles, it is shown that a different compensation is needed according to the directivity. For the particular case of the noise radiated by the rail, this has a complex directivity pattern that is only partially captured by a microphone array. It is demonstrated that the overestimation of the wheel contribution found in previous research may be attributed to a misinterpretation of part of the rail contribution from the beamforming map.

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Implications of the directivity of railway noise source on beamforming - Accepted Manuscript
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Accepted/In Press date: 6 July 2019
Published date: 27 October 2019
Keywords: Beamforming, Directivity, Railway noise, Source quantification

Identifiers

Local EPrints ID: 433644
URI: http://eprints.soton.ac.uk/id/eprint/433644
ISSN: 0022-460X
PURE UUID: 4c4e60dc-44e4-4b97-b7a1-cc2f5eb531ca
ORCID for Giacomo Squicciarini: ORCID iD orcid.org/0000-0003-2437-6398
ORCID for David J. Thompson: ORCID iD orcid.org/0000-0002-7964-5906

Catalogue record

Date deposited: 28 Aug 2019 16:30
Last modified: 18 Feb 2021 17:17

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