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Comparison of non-elliptic contact models: Towards fast and accurate modelling of wheel-rail contact
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0003-2590-3698
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0002-3447-6686
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0002-2571-4662
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.

Place, publisher, year, edition, pages
2014. Vol. 314, no 1-2, 111-117 p.
Keyword [en]
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: urn:nbn:se:kth:diva-127947DOI: 10.1016/j.wear.2013.11.047ISI: 000337018100015Scopus ID: 2-s2.0-84898787850OAI: oai:DiVA.org:kth-127947DiVA: diva2:646704
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
In thesis
1. Wheel-rail contact modelling in vehicle dynamics simulation
Open this publication in new window or tab >>Wheel-rail contact modelling in vehicle dynamics simulation
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
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:nbn:se:kth:diva-127949 (URN)978-91-7501-852-2 (ISBN)
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
2. On Efficient Modelling of Wheel-Rail Contact in Vehicle Dynamics Simulation
Open this publication in new window or tab >>On Efficient Modelling of Wheel-Rail Contact in Vehicle Dynamics Simulation
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The wheel-rail contact is at the core of all research related to vehicletrackinteraction. This tiny interface governs the dynamic performanceof rail vehicles through the forces it transmits and, like any high stressconcentration zone, it is subjected to serious damage phenomena. Thus,a clear understanding of the rolling contact between wheel and rail is keyto realistic vehicle dynamics simulation and damage analysis.

In a multi-body dynamics simulation, the demanding contact problemshould be evaluated at about every millisecond for several wheel-rail pairs.Hence, a rigorous treatment of the contact is highly time-consuming.Simplifying assumptions are therefore made to accelerate the simulationprocess. This gives rise to a trade-o between the accuracy and computationaleciency of the contact model in use.

Conventionally, Hertz+FASTSIM is used for calculation of the contactforces thanks to its low computational cost. However, the elliptic patchand pressure distribution obtained by Hertz' theory is often not realisticin wheel-rail contact. Moreover, the use of parabolic traction bound inFASTSIM causes considerable error in the tangential stress estimation.This combination leads to inaccurate damage predictions.

Fast non-elliptic contact models are proposed by others to tacklethis issue while avoiding the tedious numerical procedures. The studiesconducted in the present work show that the accuracy of these models iscase-dependent.

To improve the accuracy of non-elliptic patch and pressure estimation,a new method is proposed. The method is implemented in an algorithmnamed ANALYN. Comparisons show improvements in patch and, particularly,pressure estimations using ANALYN.

In addition, an alternative to the widely-used FASTSIM is developed, named FaStrip. Unlike FASTSIM, it employs an elliptic traction boundand is able to estimate the non-linear characteristic of tangential stressdistribution. Comparisons show more accurate estimation of tangentialstress and slip velocity distribution as well as creep forces with FaStrip.

Ultimately, an ecient non-elliptic wheel-rail contact model consistingof ANALYN and FaStrip is proposed. The reasonable computationalcost of the model enables it to be used on-line in dynamics simulationand its accuracy can improve the damage predictions.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. xiv, 97 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2016:02
Keyword
wheel-rail contact, non-elliptic contact, rail vehicle dynamics, rolling contact, vehicle-track interaction, wheel-rail damage
National Category
Vehicle Engineering Tribology
Research subject
Järnvägsgruppen - Fordonsteknik; The KTH Railway Group - Tribology; Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-181691 (URN)978-91-7595-846-0 (ISBN)
Public defence
2016-02-24, F3, Lindstedsvägen 26, KTH, Stockholm, 13:15 (English)
Opponent
Supervisors
Note

QC 20160202

Available from: 2016-02-02 Created: 2016-02-02 Last updated: 2016-02-02Bibliographically approved

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Sh. Sichani, MatinEnblom, RogerBerg, Mats

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