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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 216

Modelling the Effect of Wheel Flat on Railway-Induced Ground Vibrations

G. Alexandrou, G. Kouroussis and O. Verlinden

Department of Theoretical Mechanics, Dynamics and Vibrations, Faculty of Engineering, Université de Mons (UMONS), Belgium

Full Bibliographic Reference for this paper
G. Alexandrou, G. Kouroussis, O. Verlinden, "Modelling the Effect of Wheel Flat on Railway-Induced Ground Vibrations", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 216, 2014. doi:10.4203/ccp.104.216
Keywords: railway ground vibrations, multibody model, wheel flat, vehicle dynamics, wheel-rail contact, track deflection.

Summary
One of the most important irregularities in low speed trains is a flat on a wheel of the vehicle since it can cause large dynamic impact forces. The first part of this paper aims to investigate the behaviour of the wheel-rail contact when the wheel has a flat irregularity and travels with constant speed. The modelling of wheel-rail interface has been done using a non-linear Hertzian contact. The second part of the study attempts to model the effects of the wheel flat on railways-induced ground vibration by employing a prediction scheme based on a two-step approach. The first subproblem concerns the interaction between the vehicle and the track. Results of the simulation, more specifically the ballast reactions, are used in a second subproblem where the free field ground response is computed using a full 3-D finite/infinite model of soil under the commercial software ABAQUS. Various analyses were conducted for different vehicle speeds and sizes of the wheel flat on the case of T2000 tram in Brussels. Results of the study showed that a small wheel flat can affect significantly the impact forces transferred to the ground even at low speeds.

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