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A wavenumber domain numerical analysis of rail noise including the surface impedance of the ground

A wavenumber domain numerical analysis of rail noise including the surface impedance of the ground
A wavenumber domain numerical analysis of rail noise including the surface impedance of the ground

In most previous studies of sound radiation from railway rails, the rail has been regarded as located in free space, disregarding the influence of the ground. However, in order to predict the noise from the rail more precisely, the effect of the ground should be included in rolling noise predictions. In this study, the rail noise is investigated by means of a wavenumber domain numerical method, including the presence of the ground. For rails attached to a rigid ground or located at a certain distance above it, the influence of the ground is examined in terms of the radiation ratio and longitudinal directivity. From the prediction of radiated power, it is found that the vertical and lateral bending waves of the rail radiate most of the noise for the corresponding direction. Hence, a simplified calculation is proposed that only includes these waves, instead of a full three-dimensional analysis. An absorptive ground is also modelled by applying impedance boundary conditions at the ground surface to investigate the influence of the ground on the rail noise. Finally, for the vertical and lateral bending waves in the rail, the cross-sectional directivity of the noise is predicted for various surface impedances of the ground. It is found that the simplified calculation proposed in this study is valid for the prediction of noise from the rail. Also the presence of the ground and its impedance condition have considerable effects on the level and directivity patterns of the noise radiated from the rail.

2.5 dimensional, Ground impedance, Rail noise, Wavenumber finite element/boundary element method
0022-460X
173-191
Ryue, Jungsoo
76efda8a-00be-476b-b306-1f240b6d4986
Jang, Seungho
6aac0676-3f47-4de7-bd58-a3141ee177ff
Thompson, David J.
bca37fd3-d692-4779-b663-5916b01edae5
Ryue, Jungsoo
76efda8a-00be-476b-b306-1f240b6d4986
Jang, Seungho
6aac0676-3f47-4de7-bd58-a3141ee177ff
Thompson, David J.
bca37fd3-d692-4779-b663-5916b01edae5

Ryue, Jungsoo, Jang, Seungho and Thompson, David J. (2018) A wavenumber domain numerical analysis of rail noise including the surface impedance of the ground. Journal of Sound and Vibration, 432, 173-191. (doi:10.1016/j.jsv.2018.06.032).

Record type: Article

Abstract

In most previous studies of sound radiation from railway rails, the rail has been regarded as located in free space, disregarding the influence of the ground. However, in order to predict the noise from the rail more precisely, the effect of the ground should be included in rolling noise predictions. In this study, the rail noise is investigated by means of a wavenumber domain numerical method, including the presence of the ground. For rails attached to a rigid ground or located at a certain distance above it, the influence of the ground is examined in terms of the radiation ratio and longitudinal directivity. From the prediction of radiated power, it is found that the vertical and lateral bending waves of the rail radiate most of the noise for the corresponding direction. Hence, a simplified calculation is proposed that only includes these waves, instead of a full three-dimensional analysis. An absorptive ground is also modelled by applying impedance boundary conditions at the ground surface to investigate the influence of the ground on the rail noise. Finally, for the vertical and lateral bending waves in the rail, the cross-sectional directivity of the noise is predicted for various surface impedances of the ground. It is found that the simplified calculation proposed in this study is valid for the prediction of noise from the rail. Also the presence of the ground and its impedance condition have considerable effects on the level and directivity patterns of the noise radiated from the rail.

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Accepted/In Press date: 13 June 2018
e-pub ahead of print date: 23 June 2018
Published date: 13 October 2018
Keywords: 2.5 dimensional, Ground impedance, Rail noise, Wavenumber finite element/boundary element method

Identifiers

Local EPrints ID: 421872
URI: http://eprints.soton.ac.uk/id/eprint/421872
ISSN: 0022-460X
PURE UUID: b46e609c-9daf-45a3-92e0-8c5da6bdc474
ORCID for David J. Thompson: ORCID iD orcid.org/0000-0002-7964-5906

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Date deposited: 04 Jul 2018 16:30
Last modified: 18 Feb 2021 16:47

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Author: Jungsoo Ryue
Author: Seungho Jang

University divisions

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