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A mixed space-time and wavenumber-frequency domain procedure for modelling ground vibration from surface railway tracks

A mixed space-time and wavenumber-frequency domain procedure for modelling ground vibration from surface railway tracks
A mixed space-time and wavenumber-frequency domain procedure for modelling ground vibration from surface railway tracks
This paper presents a methodology for studying ground vibration in which the railway track is modelled in the space-time domain using the finite element method (FEM) and, for faster computation, discretisation of the ground using either FEM or the boundary element method (BEM) is avoided by modelling it in the wavenumber-frequency domain. The railway track is coupled to the ground through a series of rectangular strips located at the surface of the ground; their vertical interaction is described by a frequency-dependent dynamic stiffness matrix whose elements are represented by discrete lumped parameter models. The effectiveness of this approach is assessed firstly through frequency domain analysis using as excitation a stationary harmonic load applied on the rail. The interaction forces at the ballast/ground interface are calculated using the FE track model in the space-time domain, transformed to the wavenumber domain, and used as input to the ground model for calculating vibration in the free field. Additionally, time domain simulations are also performed with the inclusion of nonlinear track parameters. Results are presented for the coupled track/ground model in terms of time histories and frequency spectra for the track vibration, interaction forces and free-field ground vibration. For the linear track model, the results from the mixed formulation are in excellent agreement with those from a semi-analytical model formulated in the wavenumber-frequency domain, particularly in the vicinity of the loading point. The accuracy of the mixed formulation away from the excitation point depends strongly on the inclusion of through-ground coupling in the lumped parameter model, which has been found to be necessary for both track dynamics and ground vibration predictions.
0022-460X
508-532
Koroma, S.G.
37e63ed0-b7ed-46c4-98b3-d0bb9d96fffd
Thompson, D.J.
bca37fd3-d692-4779-b663-5916b01edae5
Hussein, M.F.M.
97e17881-e5e7-45a4-8765-00065c2277ce
Ntotsios, E.
877c3350-0497-4471-aa97-c101df72e05e
Koroma, S.G.
37e63ed0-b7ed-46c4-98b3-d0bb9d96fffd
Thompson, D.J.
bca37fd3-d692-4779-b663-5916b01edae5
Hussein, M.F.M.
97e17881-e5e7-45a4-8765-00065c2277ce
Ntotsios, E.
877c3350-0497-4471-aa97-c101df72e05e

Koroma, S.G., Thompson, D.J., Hussein, M.F.M. and Ntotsios, E. (2017) A mixed space-time and wavenumber-frequency domain procedure for modelling ground vibration from surface railway tracks. Journal of Sound and Vibration, 400, 508-532. (doi:10.1016/j.jsv.2017.04.015).

Record type: Article

Abstract

This paper presents a methodology for studying ground vibration in which the railway track is modelled in the space-time domain using the finite element method (FEM) and, for faster computation, discretisation of the ground using either FEM or the boundary element method (BEM) is avoided by modelling it in the wavenumber-frequency domain. The railway track is coupled to the ground through a series of rectangular strips located at the surface of the ground; their vertical interaction is described by a frequency-dependent dynamic stiffness matrix whose elements are represented by discrete lumped parameter models. The effectiveness of this approach is assessed firstly through frequency domain analysis using as excitation a stationary harmonic load applied on the rail. The interaction forces at the ballast/ground interface are calculated using the FE track model in the space-time domain, transformed to the wavenumber domain, and used as input to the ground model for calculating vibration in the free field. Additionally, time domain simulations are also performed with the inclusion of nonlinear track parameters. Results are presented for the coupled track/ground model in terms of time histories and frequency spectra for the track vibration, interaction forces and free-field ground vibration. For the linear track model, the results from the mixed formulation are in excellent agreement with those from a semi-analytical model formulated in the wavenumber-frequency domain, particularly in the vicinity of the loading point. The accuracy of the mixed formulation away from the excitation point depends strongly on the inclusion of through-ground coupling in the lumped parameter model, which has been found to be necessary for both track dynamics and ground vibration predictions.

Text A mixed space-time and wavenumber-frequency domain procedure for modelling ground vibration from surface railway tracks - Accepted Manuscript
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More information

Accepted/In Press date: 7 April 2017
e-pub ahead of print date: 25 April 2017
Published date: 21 July 2017
Organisations: Inst. Sound & Vibration Research, Dynamics Group

Identifiers

Local EPrints ID: 408617
URI: https://eprints.soton.ac.uk/id/eprint/408617
ISSN: 0022-460X
PURE UUID: 43886035-d8c7-424d-9631-6f97dae52335
ORCID for D.J. Thompson: ORCID iD orcid.org/0000-0002-7964-5906
ORCID for E. Ntotsios: ORCID iD orcid.org/0000-0001-7382-0948

Catalogue record

Date deposited: 25 May 2017 04:02
Last modified: 06 Jun 2018 13:02

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