A novel method to model wheel-rail normal contact in vehicle dynamics simulation

Matin Sh. Sichani, Roger Enblom, Mats Berg

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

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.

LanguageEnglish
Pages1752-1764
Number of pages13
JournalVehicle System Dynamics
Volume52
Issue number12
DOIs
Publication statusPublished - 2 Dec 2014
Externally publishedYes

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Pressure distribution
Rails
Wheels
Computer simulation
Costs

Cite this

Sh. Sichani, Matin ; Enblom, Roger ; Berg, Mats. / A novel method to model wheel-rail normal contact in vehicle dynamics simulation. In: Vehicle System Dynamics. 2014 ; Vol. 52, No. 12. pp. 1752-1764.
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A novel method to model wheel-rail normal contact in vehicle dynamics simulation. / Sh. Sichani, Matin; Enblom, Roger; Berg, Mats.

In: Vehicle System Dynamics, Vol. 52, No. 12, 02.12.2014, p. 1752-1764.

Research output: Contribution to journalArticle

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AU - Sh. Sichani, Matin

AU - Enblom, Roger

AU - Berg, Mats

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AB - 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.

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