United States Department of Transportation
i
Algorithms and Parametric Studies for Assessing Effects of Two-Point Contact
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1984-02-01
[PDF-1.74 MB]
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Abstract:This report describes analyses conducted to assess the effects of two-point wheel rail contact on a single wheel on the prediction of wheel-rail forces, and for including these effects in a computer program for predicting curving behavior of rail vehicles. This condition exists for conventional wheel profiles when the wheel is in flange contact with one point of contact being on the tread and the second on the flange. The condition also exists and is particularly significant when conventional wheels come into flange contact or a restraining rail is used to prevent flange contact. The analytical approaches in current use are reviewed and the predictions of computer programs using these approaches are compared to data obtained in recent tests conducted on track of the Washington Metropolitan Area Transit Authority in Washington, D.C. The analyses are incorporated into computational algorithms and a computer program for predicting wheel rail forces in curve negotiation. The program is applied to development of curving force predictions for a typical transit car operating over track with and without restraining rail. This work has indicated that significant reductions in wheel-rail wear and train resistance in curves would probably be available from wheel profiles which give only a single point of contact with the rail.
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