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Method for obtaining the wheel-rail contact location and its application to the normal problem calculation through ‘CONTACT’

Method for obtaining the wheel-rail contact location and its application to the normal problem calculation through ‘CONTACT’
Method for obtaining the wheel-rail contact location and its application to the normal problem calculation through ‘CONTACT’
This work presents a robust methodology for calculating inter-penetration areas between railway wheel and rail surfaces, the profiles of which are defined by a series of points. The method allows general three-dimensional displacements of the wheelset to be considered, and its characteristics make it especially suitable for dynamic simulations where the wheel-rail contact is assumed to be flexible. The technique is based on the discretization of the geometries of the surfaces in contact, considering the wheel as a set of truncated cones and the rail as points. By means of this approach, it is possible to reduce the problem to the calculation of the intersections between cones and lines, the solution for which has a closed-form expression. The method has been used in conjunction with the CONTACT algorithm in order to solve the static normal contact problem when the lateral displacement of the wheelset, its yaw angle and the vertical force applied in the wheelset centroid are prescribed. The results consist of smooth functions when the dependent coordinates are represented as a function of the independent ones, lacking the jump discontinuities that are present when a rigid contact model is adopted. Example results are shown and assessed for the normal contact problem for different lateral and yaw positions of the wheelset on the track.
0042-3114
1-13
Baeza, Luis
09dc5565-ad4b-49af-a104-d4b6ad28e1b0
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Squicciarini, Giacomo
c1bdd1f6-a2e8-435c-a924-3e052d3d191e
Denia, Francisco D.
5a64479b-10d6-482b-8f25-dc5b4ef39780
Baeza, Luis
09dc5565-ad4b-49af-a104-d4b6ad28e1b0
Thompson, David
bca37fd3-d692-4779-b663-5916b01edae5
Squicciarini, Giacomo
c1bdd1f6-a2e8-435c-a924-3e052d3d191e
Denia, Francisco D.
5a64479b-10d6-482b-8f25-dc5b4ef39780

Baeza, Luis, Thompson, David, Squicciarini, Giacomo and Denia, Francisco D. (2018) Method for obtaining the wheel-rail contact location and its application to the normal problem calculation through ‘CONTACT’. Vehicle System Dynamics, 1-13. (doi:10.1080/00423114.2018.1439178).

Record type: Article

Abstract

This work presents a robust methodology for calculating inter-penetration areas between railway wheel and rail surfaces, the profiles of which are defined by a series of points. The method allows general three-dimensional displacements of the wheelset to be considered, and its characteristics make it especially suitable for dynamic simulations where the wheel-rail contact is assumed to be flexible. The technique is based on the discretization of the geometries of the surfaces in contact, considering the wheel as a set of truncated cones and the rail as points. By means of this approach, it is possible to reduce the problem to the calculation of the intersections between cones and lines, the solution for which has a closed-form expression. The method has been used in conjunction with the CONTACT algorithm in order to solve the static normal contact problem when the lateral displacement of the wheelset, its yaw angle and the vertical force applied in the wheelset centroid are prescribed. The results consist of smooth functions when the dependent coordinates are represented as a function of the independent ones, lacking the jump discontinuities that are present when a rigid contact model is adopted. Example results are shown and assessed for the normal contact problem for different lateral and yaw positions of the wheelset on the track.

Text VSD2018m - Accepted Manuscript
Restricted to Repository staff only until 11 April 2019.
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More information

Accepted/In Press date: 11 January 2018
e-pub ahead of print date: 21 February 2018

Identifiers

Local EPrints ID: 417914
URI: https://eprints.soton.ac.uk/id/eprint/417914
ISSN: 0042-3114
PURE UUID: 2cd66928-3b13-4f39-9255-0f431da0e802
ORCID for Luis Baeza: ORCID iD orcid.org/0000-0002-3815-8706
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: 16 Feb 2018 17:30
Last modified: 06 Jun 2018 13:02

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Contributors

Author: Luis Baeza ORCID iD
Author: David Thompson ORCID iD
Author: Francisco D. Denia

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