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小半径曲线地铁A型车与扣件刚度匹配研究
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Abstract:
本文通过建立地铁车辆–轨道耦合动力学模型，研究了地铁A型车在小半径曲线运行时扣件刚度对轮轨动力相互作用和列车运行品质的影响规律。研究结果表明，合理的扣件刚度能够有效降低轮轨动力相互作用，增大扣件刚度有利于车轨系统的低频稳定性，但会加剧轮轨高频冲击。提出了不同曲线半径下的最优扣件刚度取值：400 m半径曲线建议取30~35 MN/m，600 m半径曲线建议取25~30 MN/m，800 m半径曲线建议取23~28 MN/m，1000 m半径曲线及直线建议取20~25 MN/m。总的来说曲线半径越小，扣件合理刚度应设置得越大，以综合提升列车运行平稳性和缓和轮轨动力相互作用。
This study established a metro vehicle-track coupled dynamics model to investigate the influence of fastener stiffness on wheel-rail dynamic interaction and train operational quality for Type A metro vehicles operating on small-radius curves. The results indicate that appropriate fastener stiffness effectively reduces wheel-rail dynamic interaction. Increasing fastener stiffness improves low-frequency stability of the vehicle-track system but intensifies high-frequency wheel-rail impact. Optimal fastener stiffness values were proposed for different curve radii: 30~35 MN/m for 400 m curves, 25~30 MN/m for 600 m curves, 23~28 MN/m for 800 m curves, and 20~25 MN/m for 1000 m curves and straight sections. In general, smaller curve radii require higher fastener stiffness to enhance ride comfort and mitigate wheel-rail dynamic interaction.
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