基于三角概率分布研究了速度分布的不均匀性对曲线轨道钢轨磨耗演变的影响。采用Archard材料磨耗模型，结合基于虚拟渗透的非Hertz滚动接触理论进行钢轨磨耗预测仿真；建立曲线区段车辆与轨道动力相互作用模型，对不同速度条件下的钢轨磨耗按权重进行累积计算，结合B-spline函数对磨耗后的钢轨型面进行平滑更新，对比分析了地铁B型车以单一速度和非均匀速度通过曲线钢弹簧浮置板区段时的钢轨磨耗的演变情况。结果表明：钢轨磨耗在圆曲线上较大，磨耗光带基本平行于轨道纵向，磨耗深度沿轨道纵向分布不均匀；钢轨磨耗范围随钢轨型面更新次数的增加逐渐增加，磨耗速率随钢轨型面更新次数的增加先增加后减小；非均匀速度通过有效提高了钢轨磨耗分布沿轨道纵向的均匀性；采用非均匀速度通过和优化钢轨型面10次更新时与采用单一速度通过和磨耗钢轨型面相比车辆累计通过数量增加了近一倍，显著减缓了曲线段钢轨磨耗速率，极大地增加了车辆运行稳定性；在地铁实际运营中可通过在高峰和低峰时段采取非均匀速度控制模式，在一定程度上减缓钢轨磨耗速率。
关键词：地铁；非均匀速度分布；磨耗预测；钢弹簧浮置板；动力响应；曲线通过
Abstract
Based on the trigonometric probability distribution, the influence of the uniformity of speed distribution on the rail wear evolution of curved track is studied. The Archard material wear model and non-Hertz rolling contact theory based on virtual penetration are used to predict rail wear; a vehicle and track dynamic interaction model on curve is established to calculate the rail wear under different running speeds by weight accumulation, and the worn rail profile is smoothed by B-spline function. The evolution of rail wear of Metro B-type vehicles passing through the curved steel spring floating plate section with single speed and non-uniform speed is compared and analyzed. Results show that the rail wear is larger on the circular curve, and the rail wear band is basically straight along the longitudinal direction of the track, while the wear depth is unevenly distributed; with the increase of rail profile updating times, the range of rail wear region increases gradually, and the rail wear speed first increases and then decreases; the non-uniform speed can effectively improve the rail wear uniformity and slow down the rail wear rate. Compared with single speed and worn rail profile, the cumulative number of vehicles passing is nearly doubled when non-uniform speed passing and optimized rail profile are used after updating for 10 times, which significantly slows down the rail wear rate of curve section and greatly increases the vehicle running stability; In the actual operation of metro, the rail wear rate can be reduced to a certain extent by adopting the non-uniform speed control mode in the peak and low peak periods.
Keywords: metro; non-uniform speed distribution; wear prediction; steel-spring floating slab; dynamic response; curve negotiation
关键词
地铁 /
非均匀速度分布 /
磨耗预测 /
钢弹簧浮置板 /
动力响应 /
曲线通过
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Key words
metro /
non-uniform speed distribution /
wear prediction /
steel-spring floating slab /
dynamic response /
curve negotiation
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