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J. Giner, P. Vila, A. Alonso, L. Baeza, "A Study of the Falling Friction Effect on Contact Parameters through Exact Contact Models", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 190, 2014. doi:10.4203/ccp.104.190

Keywords: rolling contact, non-steady state rolling contact, steady-state rolling contact, exact rolling contact theory, falling friction coefficient, Coulomb's law regularisation.

Summary

The dependence of the coefficient of friction on the local slip velocity has been associated in the literature with many important railway problems such as the squeal noise that occurs in narrow curves, certain types of corrugation of rails, braking, etc. In order to consider this effect, some researchers have tried to develop models usually based on simplified theories from Kalker that would not be adequate for considering the falling friction coefficient. In this paper a methodology based on Kalker's variational theory is presented, in which a local slip velocity-dependent friction law is considered. A formulation is proposed to first obtain, steady-state conditions of contact through an exact elastic model and second, macro-properties (creepage velocities versus total longitudinal forces) through local-properties (local slip velocity versus coefficient of friction) and vice versa. Additionally, the unsteady variational theory by Kalker is modified by introducing a regularisation of the Coulomb's law. Numerical and computational improvements and non-stationary convergence strategies are discussed.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 104 PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 190 A Study of the Falling Friction Effect on Contact Parameters through Exact Contact Models J. Giner¹, P. Vila¹, A. Alonso² and L. Baeza¹ ¹Centro de Investigación en Tecnología de Vehículos, Universidad Politécnica de Valencia, Spain ²CEIT, San Sebastián, Spain doi:10.4203/ccp.104.190 purchase the full-text of this paper Full Bibliographic Reference for this paper J. Giner, P. Vila, A. Alonso, L. Baeza, "A Study of the Falling Friction Effect on Contact Parameters through Exact Contact Models", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 190, 2014. doi:10.4203/ccp.104.190 Keywords: rolling contact, non-steady state rolling contact, steady-state rolling contact, exact rolling contact theory, falling friction coefficient, Coulomb's law regularisation. Summary The dependence of the coefficient of friction on the local slip velocity has been associated in the literature with many important railway problems such as the squeal noise that occurs in narrow curves, certain types of corrugation of rails, braking, etc. In order to consider this effect, some researchers have tried to develop models usually based on simplified theories from Kalker that would not be adequate for considering the falling friction coefficient. In this paper a methodology based on Kalker's variational theory is presented, in which a local slip velocity-dependent friction law is considered. A formulation is proposed to first obtain, steady-state conditions of contact through an exact elastic model and second, macro-properties (creepage velocities versus total longitudinal forces) through local-properties (local slip velocity versus coefficient of friction) and vice versa. Additionally, the unsteady variational theory by Kalker is modified by introducing a regularisation of the Coulomb's law. Numerical and computational improvements and non-stationary convergence strategies are discussed. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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