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International Journal of Railway Technology
IJRT, Volume 2, Issue 4, 2013
Wheel Rail Contact: Theoretical and Experimental Analysis
A. Alonso1,2, A. Guiral1,2 and J.G. Gimenez2
1CEIT, University of Navarra, San Sebastián, Spain
A. Alonso, A. Guiral, J.G. Gimenez, "Wheel Rail Contact: Theoretical and Experimental Analysis", International Journal of Railway Technology, 2(4), 15-32, 2013. doi:10.4203/ijrt.2.4.2
Keywords: wheel/rail contact, friction coefficient, experimental results, test bench, railway dynamics.
The importance of the wheel/rail contact problem in railway dynamics problems has led to the publication of many different mathematical methods. This paper summarizes the most important ones, underlining the assumptions made and their implication in the accuracy of the results. From this analysis, one of the main conclusions is that most of them tackle the wheel/rail contact problem mainly from a purely theoretical point of view, and that a theoretical/experimental comparison is required in order to analyse the influence of certain parameters not taken into account in the mathematical developments. Because of this, the second part of this paper summarizes the most important steps followed in building a scaled test-bench to experimentally characterize the wheel/rail contact problem. The results of the longitudinal contact force as a function of the longitudinal creepage are obtained under different conditions; clean and dry, friction modifier, cutting fluid and sand. In addition, the divergences, with respect to Kalker's Simplified Theory, are analyzed.
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