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Sound radiation from railway sleepers

Sound radiation from railway sleepers
Sound radiation from railway sleepers
The sleepers supporting the rails of a railway track are an important source of noise at low frequencies. The sound radiation from the sleepers has been calculated using a three-dimensional boundary element model including the effect of both reflective and partially absorptive ground. When the sleeper flexibility and support stiffness are taken into account, it is found that the radiation ratio of the sleeper can be approximated by that of a rigid half-sleeper. When multiple sleepers are excited through the rail, their sound radiation is increased. This effect has been calculated for cases where the sleeper is embedded in a rigid or partially absorptive ground. It is shown that it is sufficient to consider only three sleepers in determining their radiation ratio when installed in track. At low frequencies the vibration of the track is localised to the three sleepers nearest the excitation point whereas at higher frequencies the distance between the sleepers is large enough for them to be treated independently. Consequently the sound radiation increases by up to 5 dB below 100 Hz compared with the result for a single sleeper whereas above 300 Hz the result can be approximated by that for a single sleeper. Measurements on a 1/5 scale model railway track are used to verify the numerical predictions with good agreement being found for all configurations.
0022-460X
178-194
Zhang, Xianying
320e5f8a-84d4-4d23-a062-124a11eedf5c
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Squicciarini, Giacomo
c1bdd1f6-a2e8-435c-a924-3e052d3d191e
Zhang, Xianying
320e5f8a-84d4-4d23-a062-124a11eedf5c
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Squicciarini, Giacomo
c1bdd1f6-a2e8-435c-a924-3e052d3d191e

Zhang, Xianying, Thompson, David and Squicciarini, Giacomo (2016) Sound radiation from railway sleepers. Journal of Sound and Vibration, 369, 178-194. (doi:10.1016/j.jsv.2016.01.018).

Record type: Article

Abstract

The sleepers supporting the rails of a railway track are an important source of noise at low frequencies. The sound radiation from the sleepers has been calculated using a three-dimensional boundary element model including the effect of both reflective and partially absorptive ground. When the sleeper flexibility and support stiffness are taken into account, it is found that the radiation ratio of the sleeper can be approximated by that of a rigid half-sleeper. When multiple sleepers are excited through the rail, their sound radiation is increased. This effect has been calculated for cases where the sleeper is embedded in a rigid or partially absorptive ground. It is shown that it is sufficient to consider only three sleepers in determining their radiation ratio when installed in track. At low frequencies the vibration of the track is localised to the three sleepers nearest the excitation point whereas at higher frequencies the distance between the sleepers is large enough for them to be treated independently. Consequently the sound radiation increases by up to 5 dB below 100 Hz compared with the result for a single sleeper whereas above 300 Hz the result can be approximated by that for a single sleeper. Measurements on a 1/5 scale model railway track are used to verify the numerical predictions with good agreement being found for all configurations.

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Sound radiation from railway sleepers - Accepted Manuscript
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Accepted/In Press date: 11 January 2016
e-pub ahead of print date: 5 February 2016
Published date: 12 May 2016
Organisations: Dynamics Group

Identifiers

Local EPrints ID: 386789
URI: http://eprints.soton.ac.uk/id/eprint/386789
ISSN: 0022-460X
PURE UUID: ad4caa1e-4afe-4fd0-ae14-1574ed20296e
ORCID for David Thompson: ORCID iD orcid.org/0000-0002-7964-5906
ORCID for Giacomo Squicciarini: ORCID iD orcid.org/0000-0003-2437-6398

Catalogue record

Date deposited: 04 Feb 2016 16:25
Last modified: 18 Feb 2021 17:17

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Contributors

Author: Xianying Zhang
Author: David Thompson ORCID iD

University divisions

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