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Wheel-rail contact modelling in vehicle dynamics simulation
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0003-2590-3698
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The wheel-rail contact is at the core of all research related to vehicle-track interaction. This tiny interface governs the dynamic performance of rail vehicles through the loads it transmits and, like any high stress concentration zone, it is subjected to serious damage phenomena. Thus, a clear understanding of the rolling contact between wheel and rail is key to realistic vehicle dynamic simulation and damage analyses.

In a multi-body-system simulation package, the essentially demanding contact problem should be evaluated in about every millisecond. Hence, a rigorous treatment of the contact is highly time consuming. Simplifying assumptions are, therefore, made to accelerate the simulation process. This gives rise to a trade-off between accuracy and computational efficiency of the contact models in use.

Historically, Hertz contact solution is used since it is of closed-form. However, some of its underlying assumptions may be violated quite often in wheel-rail contact. The assumption of constant relative curvature which leads to an elliptic contact patch is of this kind. Fast non-elliptic contact models are proposed by others to lift this assumption while avoiding the tedious numerical procedures. These models are accompanied by a simplified approach to treat tangential tractions arising from creepages and spin.

In this thesis, in addition to a literature survey presented, three of these fast non-elliptic contact models are evaluated and compared to each other in terms of contact patch, pressure and traction distributions as well as the creep forces. Based on the conclusions drawn from this evaluation, a new method is proposed which results in more accurate contact patch and pressure distribution estimation while maintaining the same computational efficiency. The experience gained through this Licentiate work illuminates future research directions among which, improving tangential contact results and treating conformal contacts are given higher priority.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. , xi, 55 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2013:47
Keyword [en]
wheel-rail contact, non-elliptic contact, vehicle-track interaction, rail vehicle dynamics, rolling contact, MBS, virtual penetration
National Category
Tribology Vehicle Engineering Applied Mechanics
Research subject
Järnvägsgruppen - Fordonsteknik; The KTH Railway Group - Tribology
Identifiers
URN: urn:nbn:se:kth:diva-127949ISBN: 978-91-7501-852-2 (print)OAI: oai:DiVA.org:kth-127949DiVA: diva2:646708
Presentation
2013-10-02, E2, Lindstedsvägen 3, KTH, Stockholm, 13:15 (English)
Opponent
Supervisors
Note

QC 20130911

Available from: 2013-09-11 Created: 2013-09-09 Last updated: 2013-09-11Bibliographically approved
List of papers
1. Comparison of non-elliptic contact models: Towards fast and accurate modelling of wheel-rail contact
Open this publication in new window or tab >>Comparison of non-elliptic contact models: Towards fast and accurate modelling of wheel-rail contact
2014 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 314, no 1-2, 111-117 p.Article in journal (Refereed) Published
Abstract [en]

The demand to investigate and predict the surface deterioration phenomena in the wheel-rail interface necessitates fast and accurate contact modelling. During the past 20 years, there have been attempts to determine more realistic contact patch and stress distributions using fast simplified methods. The main aim of the present work is to compare some of these state-of-the-art, non-elliptic contact models available in the literature. This is considered as the first step to develop a fast and accurate non-elliptic contact model that can be used on-line with vehicle dynamics analysis. Three contact models, namely STRIPES, Kik-Piotrowski and Linder are implemented and compared in terms of contact patch prediction, as well as contact pressure and traction distributions. The evaluation of these models using CONTACT software indicate the need for improvement of contact patch and pressure estimation in certain contact cases.

Keyword
Modelling, Non-elliptic contact, Rail vehicle dynamics, Rolling contact, Wheel-rail contact
National Category
Vehicle Engineering Tribology Applied Mechanics
Research subject
The KTH Railway Group - Tribology; Järnvägsgruppen - Fordonsteknik
Identifiers
urn:nbn:se:kth:diva-127947 (URN)10.1016/j.wear.2013.11.047 (DOI)000337018100015 ()2-s2.0-84898787850 (Scopus ID)
Note

QC 20140520. Updated from manuscript to article in journal.

Available from: 2013-09-09 Created: 2013-09-09 Last updated: 2017-12-06Bibliographically approved
2. An approximate analytical method to solve frictionless contact between elastic bodies of revolution
Open this publication in new window or tab >>An approximate analytical method to solve frictionless contact between elastic bodies of revolution
(English)Manuscript (preprint) (Other academic)
Abstract [en]

An analytical method is proposed for calculating the contact patch and pressure distribution between two elastic bodies generated by rotating arbitrary profiles about parallel axes. The elastic deformation is approximated based on the separation between the bodies in contact. This makes it possible to estimate the contact patch analytically. The contact pressure distribution, in the direction perpendicular to the axes of rotation, is assumed to be elliptic with its maximum calculated by applying Hertz solution locally. The results are exact for contact between two ellipsoids when compared against Hertz's. In non-elliptic contact cases (e.g. in wheel-rail contact) good agreement is achieved in comparison to more accurate but computationally expensive methods such as Kalker's variational method (CONTACT algorithm). Compared to simplified non-elliptic contact methods based on virtual penetration, the calculated contact patch and pressure distribution are markedly improved. The computational cost of the proposed method is significantly lower than the more detailed methods, making it worthwhile to be applied to rolling contact in rail vehicle dynamic simulation.

Keyword
Contact mechanics, Non-elliptic contact, Wheel-rail contact, Vehicle-track interaction, Rolling contact
National Category
Tribology Vehicle Engineering Applied Mechanics
Research subject
Järnvägsgruppen - Fordonsteknik; The KTH Railway Group - Tribology
Identifiers
urn:nbn:se:kth:diva-127948 (URN)
Note

QS 2013

Available from: 2013-09-09 Created: 2013-09-09 Last updated: 2013-09-11Bibliographically approved

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Shahzamanian Sichani, Matin

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