Research Papers

On the Contact Search Algorithms for Wheel/Rail Contact Problems

[+] Author and Article Information
Hiroyuki Sugiyama

Department of Mechanical Engineering, Tokyo University of Science, Tokyo 102-0073, Japanhsugiy1@rs.kagu.tus.ac.jp

Yoshihiro Suda

Institute of Industrial Science, University of Tokyo, Tokyo 153-8505, Japansuda@iis.u-tokyo.ac.jp

J. Comput. Nonlinear Dynam 4(4), 041001 (Aug 24, 2009) (7 pages) doi:10.1115/1.3187211 History: Received June 14, 2008; Revised December 08, 2008; Published August 24, 2009

In this investigation, contact search algorithms for the analysis of wheel/rail contact problems are discussed, and the on-line and off-line hybrid contact search method is developed for multibody railroad vehicle dynamics simulations using the elastic contact formulation. In the hybrid algorithm developed in this investigation, the off-line search that can be effectively used for the tread contact is switched to the on-line search when the contact point is jumped to the flange region. In the two-point contact scenarios encountered in curve negotiations, the on-line search is used for both tread and flange contacts to determine the two-point contact configuration. By so doing, contact points on the flange region given by the off-line tabular search are never used, but rather used as an initial estimate for the online iterative procedure for improving the numerical convergence. Furthermore, the continual on-line detection of the second point of contact is replaced with a simple table look-up. It is demonstrated by several numerical examples that include flange climb and curve negotiation scenarios that the proposed hybrid contact search algorithm can be effectively used for modeling wheel/rail contacts in the analysis of general multibody railroad vehicle dynamics.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

Parametrization of wheelset

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Figure 7

Suspended wheelset model

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Figure 10

Wheelset lateral and vertical displacements

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Figure 11

Lateral contact point and the contact angle (left wheel)

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Figure 12

Flange climb (hybrid method)

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Figure 13

Configuration of wheel/rail (t=0.13 s)

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Figure 14

Wheelset lateral displacement and yaw angle

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Figure 15

Lateral contact point and the contact angle (outer wheel)

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Figure 2

Parametrization of rail

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Figure 3

Tread and flange contact points of elastic and rigid contact models (a) elastic contact model and (b) rigid contact model

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Figure 4

Three-dimensional wheel/rail contact on the tread and flange

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Figure 5

Wheelset trajectory coordinates

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Figure 6

On-line/off-line hybrid contact search algorithm

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Figure 8

Lateral displacement and yaw angle (-○-: off-line search and -●-: on-line search)

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Figure 9

Contact geometry analysis of turnout section



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