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XIAO Xin-biao, JIN Xue-song, WEN Ze-feng. Influence of Rail Fastener Failure on Vehicle Dynamic Derailment[J]. Journal of Traffic and Transportation Engineering, 2006, 6(1): 10-15.
Citation: XIAO Xin-biao, JIN Xue-song, WEN Ze-feng. Influence of Rail Fastener Failure on Vehicle Dynamic Derailment[J]. Journal of Traffic and Transportation Engineering, 2006, 6(1): 10-15.
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Influence of Rail Fastener Failure on Vehicle Dynamic Derailment

  • State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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  • Author Bio:

    XIAO Xin-biao(1978-), male, doctoral student, 86-28-87634355, xiao.xinbiao@163.com

  • Received Date: 2005-07-21
  • Publish Date: 2006-03-25
    Abstract
  • In order to investigate the effect of disabled fastener system on railway vehicle derailment, a non-symmetrical vehicle-track coupling dynamics model was established.The abrupt change of track stiffness along the track was assumed to simulate the failure situation of rail fastener system.The effect of discrete sleeper support on the coupling dynamics of vehicle and track was taken into consideration.The creepage formulas of wheel/rail rolling contact were deduced, in which the lateral, vertical and torsional motions of rail were taken into account, the normal forces of wheel/rail were calculated by Hertzian contact theory, the creep forces of wheel/rail rolling contact were decided by the nonlinear creep theory of Shen.The motion equations of vehicle/track coupling system were solved with new explicit integration method.The effect of five seriate fasteners' system in different failure situations on railway vehicle derailment was analyzed and evaluated.The ratio of lateral force and vertical force on wheel and rail, wheel load reduction ratio, vehicle derailment time and the variations of contact points on wheel treads were computed.Numerical computation result indicates that when the failure index increases from 0.8 to 1.0, that is to say, rail fasteners experience a process from almost looseness to complete looseness, the influence of rail fastener failure on vehicle dynamic derailment shows an exponential rule.

     

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