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《Chinese Journal of Theoretical and Applied Mechanics》 2008-01
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Xiao Xinbiao Jin Xuesong Wen Zefeng (State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu (310031, China)  
In order to investigate the effect of track support failure on dynamic response of tangent track, a vehicle-track coupling dynamic model is established, in which the rails are assumed to be Timoshenko beams resting on the discrete sleepers. The failure situation of track components under the tangent track is simulated by the abrupt changes of track stiffness along the track. The effect of the discrete sleeper supports on the coupling dynamics of the vehicle and track is taken into consideration by the excitation model of moving sleeper supported. As to the interaction of wheel and rail system, the creepage formulas of wheel/rail rolling contact are deduced, in which the lateral, vertical and torsional motions of rail are taken into account. The normal forces of wheel/rail are calculated by the Hertzian contact theory and the creep forces of wheel/rail in rolling contact are decided by the nonlinear creep theory of Shen et al. The motion equations of the vehicle/track coupling system are solved with the new explicit integration method. Effect of zero, two, four and six track supports in failure situation on tangent track dynamic response is analyzed and evaluated. The numerical results indicate that track support failure greatly affects dynamic response of tangent track. With the increasing of failure number, the wheel/rail normal forces, displacement and acceleration of track components increase quickly, which will deteriorate the track.
【Fund】: 国家自然科学基金(50521503);; 教育部创新团队执行计划(IRT0452);; 全国百篇优秀博士学位论文作者专项基金(200248)资助项目.~~
【CateGory Index】: U213.2
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