Effect of tangent track buckle on vehicle derailment |
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Authors: | Xinbiao?Xiao Email author" target="_blank">Xuesong?JinEmail author Zefeng?Wen Minhao?Zhu Weihua?Zhang |
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Affiliation: | (1) Fraunhofer IOSB, Karlsruhe, Germany;(2) Geophysical Institute, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;(3) Department of Railway Systems, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany |
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Abstract: | In order to investigate the effect of a tangent track buckle on the dynamic derailment of a railway vehicle, a coupled vehicle/track
dynamics model is developed, in which the vehicle is modeled as a 35 D.O.F. multibody system and the track is modeled as a
3-layer discrete elastic support model. Rails are assumed to be Timoshenko beams supported by discrete sleepers, and the effects
of vertical and lateral motions and rolling of the rail on the wheel/rail creepages are taken into account. The sleepers are
treated as Euler beams on elastic foundation for the vertical vibration, while as lumped masses in the lateral direction.
A moving sleeper support model is developed to simulate the effect of the periodical discrete sleepers on the vehicle/track
interaction. The vehicle and the track are coupled by wheel/rail contacts whereas the normal forces and the creep forces are
calculated using the Hertzian contact theory and the nonlinear creep theory by Shen et al., respectively. The equations of
motion of the coupled vehicle/track system are solved by means of an explicit integration method. A tangent track buckle is
simulated with a cosine function, which describes the misalignment of the track with different lengths due to its buckling.
In the analysis the effects of the buckle wavelength and amplitude and of the vehicle speed on the dynamic behavior of the
coupled vehicle/track system are considered. The present paper analyzes in detail the conventional derailment coefficients
which include the ratio of the wheel/rail lateral force to the vertical force, the wheel load reduction, and the new criteria
indicating the wheel/rail contact point traces and the wheel rise with respect to the rail. These criteria are simultaneously
used to evaluate the risk of derailment of the whole vehicle. The numerical results obtained indicate that the track misalignment
caused by the buckle and the vehicle speed have a great influence on the whole vehicle running safety when the vehicle passes
through the buckled tangent track. |
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