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The horizontal directivity of noise radiated by a rail and implications for use of microphone arrays

Kitagawa, Toshiki and Thompson, David J. (2010) The horizontal directivity of noise radiated by a rail and implications for use of microphone arrays Journal of Sound and Vibration, 329, (2), pp. 202-220. (doi:10.1016/j.jsv.2009.09.002).

Record type: Article


Structural waves propagating along a railway rail form an extended source of sound radiation. Using an equivalent source model the distribution of this sound in a horizontal plane is investigated and shown to consist mainly of sound propagation at a particular angle to the normal. This direction is determined by the ratio of the wavenumbers in the rail and in air. Due to the extended nature of the rail as a source, the spatial distribution of the sound field in the direction along the track does not lend itself to the use of a simple directivity factor. The consequences for the measurement of noise from the rail using a microphone array are then explored. It is shown that a microphone array focussed normal to the rail does not detect most of the sound radiated by the rail. By turning the focus angle, the sound detected becomes a maximum when this angle corresponds to the angle of propagation of the sound radiation. Measurements on a test track using artificial excitation and measurements during the passage of a train confirm these conclusions

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Published date: 18 January 2010
Organisations: Dynamics Group


Local EPrints ID: 148995
ISSN: 0022-460X
PURE UUID: 34949b3c-8623-4d7f-9e86-7893221f16ce
ORCID for David J. Thompson: ORCID iD

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Date deposited: 29 Apr 2010 13:07
Last modified: 18 Jul 2017 19:31

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