Effect of Hollow Worn Tread of Electric Multiple Units on Vehicle Stability
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摘要: 针对某型高速动车组在运行过程中出现构架横向报警的问题，建立考虑踏面凹型磨耗的动车组动力学模型. 通过仿真分析和现场试验相结合的方法，研究不同运行里程凹型磨耗踏面与钢轨的轮轨关系以及凹磨踏面对车辆稳定性的影响. 研究结果表明：镟修踏面与钢轨匹配时轮轨接触点呈现均匀分布，凹型磨耗踏面轮轨接触点主要分布在凹磨区域两侧；随着轮对横移接触点发生跳跃，产生假轮缘效应，引起剧烈的轮轨横向冲击；随着凹磨加剧车辆稳定性逐渐降低，当车辆高速运行过程中，凹磨踏面对应构架蛇行带来横向振动频率与构架自身的固有振动频率接近，容易发生横向耦合振动，使得横向加速度超过限制值；踏面凹磨是造成构架横向报警重要原因，通过轮对镟修能够有效抑制构架报警情况发生.Abstract: To solve the issue of frame lateral instability alarm of high-speed EMU (electric multiple units) in the running process, a vehicle dynamics model considering hollow worn tread was established. The wheel-rail relationship between worn treads of different running distance and rail as well as the influence of hollow worn tread on vehicle stability were researched used theoretical analysis, simulation analysis and field tests.The calculation results show that the contact points between turning tread and rail are in uniform distribution. However, for hollow wear tread, contact points distributed on both sides of the depression area. The“False flange effect”initiated by leap metastases of contact point caused severe lateral wheel/rail impact. While the vehicle running at high speed, the lateral vibration frequency is close to the natural vibration frequency of the frame itself, which would induce lateral coupled vibration of bogie and exceed the limit criteria. Through simulation analysis and field test discover hollow worn tread is an important indication for frame lateral alarm. Using wheel re-profiling can improve lateral stability of bogie.
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Key words:
- high-speed electric multiple units /
- hollow worn tread /
- wheel/rail contact /
- stability
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