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On Efficient Modelling of Wheel-Rail Contact in Vehicle Dynamics Simulation
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.ORCID iD: 0000-0003-2590-3698
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 [en]
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: urn:nbn:se:kth:diva-181691ISBN: 978-91-7595-846-0 (print)OAI: oai:DiVA.org:kth-181691DiVA: diva2:899731
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
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. A novel method to model wheel-rail normal contact in vehicle dynamics simulation
Open this publication in new window or tab >>A novel method to model wheel-rail normal contact in vehicle dynamics simulation
2014 (English)In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 52, no 12, 1752-1764 p.Article in journal (Refereed) Published
Abstract [en]

An approximate analytical method is proposed for calculating the contact patch and pressure distribution in the wheel-rail interface. The deformation of the surfaces in contact is approximated using the separation between them. This makes it possible to estimate the contact patch analytically. The contact pressure distribution in the rolling direction is assumed to be elliptic with its maximum calculated by applying Hertz' solution locally. The results are identical to Hertz's for elliptic cases. In non-elliptic cases good agreement is achieved in comparison to the more accurate but computationally expensive Kalker's variational method (CONTACT code). 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 dynamics simulation. Such fast and accurate estimation of contact patch and pressure paves the way for on-line modelling of damage phenomena in dynamics simulation packages.

Keyword
rail vehicle dynamics, Hertz, non-elliptic contact, wheel-rail contact
National Category
Vehicle Engineering
Research subject
Järnvägsgruppen - Fordonsteknik
Identifiers
urn:nbn:se:kth:diva-157589 (URN)10.1080/00423114.2014.961932 (DOI)000345075000011 ()2-s2.0-84911498531 (Scopus ID)
Note

QC 20150623

Available from: 2014-12-12 Created: 2014-12-11 Last updated: 2017-12-05Bibliographically approved
3. Non-Elliptic Wheel-Rail Contact Modelling in Vehicle Dynamics Simulation
Open this publication in new window or tab >>Non-Elliptic Wheel-Rail Contact Modelling in Vehicle Dynamics Simulation
2014 (English)In: The international Journal of railway technology, ISSN 2049-5358, E-ISSN 2053-602X, Vol. 3, no 3, 77-94 p.Article in journal (Refereed) Published
Abstract [en]

An approximate rolling contact model is introduced for fast evaluation of the contactpatch and stress distribution in the wheel-rail interface, capable of being usedon-line with dynamics simulations. The normal part of the model is based on a novelapproach in which the surface deformations are approximated, resulting in accuratepatch and pressure estimation. The tangential part is based on an adaptation of FASTSIMalgorithm to non-elliptic patches. The new model is compared to the approximatemodel of Kik and Piotrowski and the results are evaluated using Kalker’s CONTACTcode. The comparison clearly shows that the new model is more accurate than Kikand Piotrowski’s in terms of contact patch and stress distribution as well as creepforce estimation.

National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-181013 (URN)
Note

QC 20160202

Available from: 2016-01-26 Created: 2016-01-26 Last updated: 2017-11-30Bibliographically approved
4. An Alternative to FASTSIM for Tangential Solution of the Wheel-Rail Contact
Open this publication in new window or tab >>An Alternative to FASTSIM for Tangential Solution of the Wheel-Rail Contact
(English)Manuscript (preprint) (Other academic)
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-181696 (URN)
Note

QS 2016

Available from: 2016-02-02 Created: 2016-02-02 Last updated: 2016-02-02Bibliographically approved
5. A Fast Wheel-Rail Contact Model for Detailed Damage Analysis in Dynamics Simulation
Open this publication in new window or tab >>A Fast Wheel-Rail Contact Model for Detailed Damage Analysis in Dynamics Simulation
(English)Manuscript (preprint) (Other academic)
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-181697 (URN)
Note

QS 2016

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

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