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The effect of track load correlation on ground-borne vibration from railways

The effect of track load correlation on ground-borne vibration from railways
The effect of track load correlation on ground-borne vibration from railways
In predictions of ground-borne vibration from railways, it is generally assumed that the unevenness profile of the wheel and rail is fully correlated between the two rails and the two wheels of an axle. This leads to identical contact forces at the two rails and can allow further simplifications of the vehicle model, the track model and the track/ground interface conditions. In the present paper, the level of correlation of the track loading at the wheel/rail interface due to rail unevenness and its influence on predictions of ground vibration is investigated. The extent to which the unevenness of the two rails is correlated has been estimated from measurements of track geometry obtained with track recording vehicles for four different tracks. It was found that for wavelengths longer than about 3 m the unevenness of the two rails can be considered to be strongly correlated and in phase. To investigate the effect of this on ground vibration, an existing model expressed in the wavenumber-frequency domain is extended to include separate inputs on the two rails. The track is modelled as an infinite invariant linear structure resting on an elastic stratified half-space. This is excited by the gravitational loading of a passing train and the irregularity of the contact surfaces between the wheels and the rails. The railway model is developed in this work to be versatile so that it can account or discard the effect of load correlations on the two rails beside the effects of variation of the tractions across the width of the track-ground interface and the vehicle sprung mass, as well as the roll motion of the sleepers and the axle. A comparative analysis is carried out on the influence of these factors on the response predictions using numerical simulations. It is shown that, when determining the vibration in the free field, it is important to include in the model the traction variation across the track-ground interface and the non-symmetrical loading at the two rails that occurs for unevenness wavelengths shorter than about 3 m.
ground-borne vibration, track unevenness correlation, wavenumber-frequency domain model
0022-460X
142-163
Ntotsios, Evangelos
877c3350-0497-4471-aa97-c101df72e05e
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Hussein, Mohammed
3535c131-1710-4edc-a4a1-8fe67dee3f67
Ntotsios, Evangelos
877c3350-0497-4471-aa97-c101df72e05e
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Hussein, Mohammed
3535c131-1710-4edc-a4a1-8fe67dee3f67

Ntotsios, Evangelos, Thompson, David and Hussein, Mohammed (2017) The effect of track load correlation on ground-borne vibration from railways Journal of Sound and Vibration, 402, pp. 142-163. (doi:10.1016/j.jsv.2017.05.006).

Record type: Article

Abstract

In predictions of ground-borne vibration from railways, it is generally assumed that the unevenness profile of the wheel and rail is fully correlated between the two rails and the two wheels of an axle. This leads to identical contact forces at the two rails and can allow further simplifications of the vehicle model, the track model and the track/ground interface conditions. In the present paper, the level of correlation of the track loading at the wheel/rail interface due to rail unevenness and its influence on predictions of ground vibration is investigated. The extent to which the unevenness of the two rails is correlated has been estimated from measurements of track geometry obtained with track recording vehicles for four different tracks. It was found that for wavelengths longer than about 3 m the unevenness of the two rails can be considered to be strongly correlated and in phase. To investigate the effect of this on ground vibration, an existing model expressed in the wavenumber-frequency domain is extended to include separate inputs on the two rails. The track is modelled as an infinite invariant linear structure resting on an elastic stratified half-space. This is excited by the gravitational loading of a passing train and the irregularity of the contact surfaces between the wheels and the rails. The railway model is developed in this work to be versatile so that it can account or discard the effect of load correlations on the two rails beside the effects of variation of the tractions across the width of the track-ground interface and the vehicle sprung mass, as well as the roll motion of the sleepers and the axle. A comparative analysis is carried out on the influence of these factors on the response predictions using numerical simulations. It is shown that, when determining the vibration in the free field, it is important to include in the model the traction variation across the track-ground interface and the non-symmetrical loading at the two rails that occurs for unevenness wavelengths shorter than about 3 m.

Text correlation_accepted - Accepted Manuscript
Restricted to Repository staff only until 2 October 2018.
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More information

Submitted date: 21 September 2016
Accepted/In Press date: 2 May 2017
Published date: 18 August 2017
Keywords: ground-borne vibration, track unevenness correlation, wavenumber-frequency domain model
Organisations: Dynamics Group

Identifiers

Local EPrints ID: 408108
URI: https://eprints.soton.ac.uk/id/eprint/408108
ISSN: 0022-460X
PURE UUID: d5952e70-decd-447a-8238-c83322b07289
ORCID for Evangelos Ntotsios: ORCID iD orcid.org/0000-0001-7382-0948
ORCID for David Thompson: ORCID iD orcid.org/0000-0002-7964-5906

Catalogue record

Date deposited: 12 May 2017 04:03
Last modified: 21 Nov 2017 17:31

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Author: David Thompson ORCID iD
Author: Mohammed Hussein

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