Influence of rail weld irregularity on dynamic stress of bogie frame based on vehicle-track rigid-flexible coupled model
Influence of rail weld irregularity on dynamic stress of bogie frame based on vehicle-track rigid-flexible coupled model
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DOI：
10.1177/10775463221113728
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发表时间：
2022-07
影响因子：
2.8
通讯作者：
Yi Sun;Lai Wei;H. Dai;Chaotao Liu;Sheng Qu;Yayun Qi
中科院分区：
文献类型：
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作者：
Yi Sun;Lai Wei;H. Dai;Chaotao Liu;Sheng Qu;Yayun Qi
为了研究钢轨焊接不平整度对转向架框架动应力的影响，建立了考虑转向架框架柔性的数值模型。通过现场实测验证了所提模型的可靠性，并观测到转向架框架在50hz时的模态振动，包括横梁的弯曲变形。将柔性转向架框架模型与传统的多体动力学模型进行比较，研究了转向架框架的柔性对轮轨相互作用的影响。然后建立了钢轨焊接接头的数值模型，研究了转向架框架的P2共振特性和动应力分布。对比了不同钢轨焊缝不平整度的影响，并进行了参数研究。然后讨论了紧固件刚度对P2共振频率的影响。结果表明，在模拟时必须考虑转向架框架的柔性，这将加剧轮轨振动。短波长在一定速度下会引起转向架车架的模态振动，过大的轨道支撑刚度将威胁车辆的运行安全，并可能导致车轮外圆的形成。并对钢轨焊缝不规则度的限值进行了探讨，从不同方面为钢轨表面磨削提供参考。
To examine the effects of rail weld irregularity on the dynamic stress of the bogie frame, a numerical model which considers the bogie frame flexibility is established. Field measurements were conducted to validate the reliability of the proposed model and the bogie frame’s modal vibration including the bending deformation of cross beams at 50 Hz can be observed. A comparison between the flexible bogie frame model and the traditional multi-body dynamics model is conducted to investigate the influences of the bogie frame’s flexibility on wheel-rail interactions. Then the numerical model of the rail weld joint is proposed to study the P2 resonance performance and the dynamic stress patterns of the bogie frame. A comparison of influences with different rail weld irregularities and parameter studies are conducted. Then the effects of fastener stiffness on P2 resonance frequencies are discussed. The results show that it is necessary to consider the bogie frame’s flexibility in simulations which will aggravate the wheel-rail vibrations. The short wavelengths in combination with a certain speed could induce the bogie frame’s modal vibration and large track supporting stiffness will threaten the running safety of the vehicle which may also contribute to the formation of wheel out-of-roundness. Besides, the limit values of the rail weld irregularities are discussed to provide a reference for rail surface grinding from different aspects.