基于柔性车体的地铁车辆垂向耦合振动规律研究
韦海菊王日艺
Study on Vertical Coupling Vibration Law of Metro Vehicle Based on Flexible Carbody
WEI HaijuWANG Riyi
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作者信息:中车南京浦镇车辆有限公司， 210031， 南京
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Affiliation:CRRC Nanjing Puzhen Co., Ltd., 210031, Nanjing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.05.008
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中图分类号/CLCN:U260.331
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栏目/Col:研究报告
摘要:
［目的］由于列车运行速度的提高和轻量化设计，使轮轨之间的动态作用力增大，从而使车辆中各部件之间振动加剧，严重影响着动力学性能，故需研究转向架与柔性车体之间的垂向耦合振动的规律。［方法］以某型号地铁车辆为研究对象，建立其包含柔性车体的刚柔耦合模型，通过相关测点的平稳性指数来研究车体结构模态与转向架悬挂模态之间垂向振动耦合关系。［结果及结论］结果表明，仅考虑车体一阶垂弯模态，当转向架的浮沉、点头频率与车体垂向一阶弯曲频率相近时，会引发柔性车体与转向架耦合共振现象，其中中部测点所受影响最大。仅考虑车体菱形变形模态和一阶扭转模态时，不会出现转向架与柔性车体耦合共振现象，但二者会受到轨道激扰共振效应现象的影响。考虑车体组合结构模态时，车体中部测点受一阶垂弯振型的影响最大，会发生柔性车体与转向架耦合共振现象；而转向架上方的车体测点则容易受到车体一阶扭转模态的影响，在部分速度级别下会发生模态共振效应。
Abstracts:
［Objective］ With the increase in train operating speed and the adoption of lightweight design, the dynamic forces between the wheel-rail interface are intensified, leading to exacerbated vibrations among various components of the vehicle. This significantly affects the vehicle dynamics performance, necessitating research on vertical coupling vibration law between bogie and flexible carbody. ［Method］ Taking a certain model of metro train as the research subject, a rigid-flexible coupling model including a flexible carbody is established. The vertical vibration coupling relationship between the carbody structure mode and the bogie suspension mode is studied using the steadiness index of relevant measuring points. ［Result & Conclusion］ The results indicate that, when the bogie floating and nodding frequencies are close to the first-order bending frequency of the carbody, considering only the first-order vertical bending mode of carbody can induce a coupling resonance phenomenon between the flexible body and the bogie, with the central measuring point being the most affected. When considering only the rhomboid deformation mode and first-order torsional mode of the carbody, coupling resonance between bogie and flexible carbody will not occur, but both are influenced by track excitation resonance effect. When considering the carbody combined structure mode, the central measuring point of the carbody is most affected by the first-order vertical bending mode, leading to a coupled resonance phenomenon between the flexible carbody and the bogie. On the other hand, the carbody measuring points above the bogie are prone to be affected by first-order torsional mode, resulting in modal resonance effects at some speed levels.
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