Hunting motion of high-speed emu during cross-line operation: Mechanism and countermeasures
Hunting motion of high-speed emu during cross-line operation: Mechanism and countermeasures
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DOI：
10.1177/09544097231195917
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发表时间：
2023-08
期刊：
影响因子：
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通讯作者：
Zhenning Yang;Lai Wei;Feng Gan;Dadi Li;H. Dai
中科院分区：
文献类型：
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作者：
Zhenning Yang;Lai Wei;Feng Gan;Dadi Li;H. Dai
中国250 km/h级动车组在运营过程中，从B线跨A线时出现蛇行现象。已经进行了大量的测试和模拟来研究这种现象的机制。通过对两条线路实测钢轨断面的比较，发现A线左侧钢轨在内轨肩处高于B线左侧钢轨。此外，A线右轨顶部位置比B线右轨顶部位置向内侧靠近约2-3 mm，A线右轨在内轨肩处高于B线。这些差异导致动车组从B线穿越A线时轮轨等效锥度显著增大，进而产生蛇行现象。并对动车组越线蛇行的对策进行了仿真和试验研究。现场试验结果表明，增大偏航阻尼器阻尼和车轮整形均能改善动车组越线运行稳定性，但在轮轨关系特别差的情况下，增大偏航阻尼器阻尼的效果有限。仿真结果表明，参照中国60 N钢轨断面对A线钢轨进行打磨，也能提高动车组跨线运行的稳定性。
During the operation of the Chinese 250 km/h-level EMU, hunting occurs when the EMU crosses from Line B to Line A. Numerous tests and simulations have been conducted to investigate the mechanism of this phenomenon. Comparisons of the measured rail profiles of the two lines indicate that the left rail in Line A is higher than that in Line B at the inner rail shoulder. In addition, the top position of the right rail in Line A is approximately 2–3 mm closer to the inside than that of the right rail in Line B, with the right rail in Line A being higher than that in Line B at the inner rail shoulder. These differences cause a significant increase in the wheel–rail equivalent conicity when the EMU crosses from Line B to Line A and further cause the hunting phenomenon. Moreover, simulations and experiments are conducted to investigate the countermeasures for EMU cross-line hunting. Field test results show that both increasing the damping of the yaw damper and wheel reprofiling can improve the stability during EMU cross-line operation; however, the effect of increasing the damping of the yaw damper is limited under particularly poor wheel–rail relationship. Simulation results reveal that rail grinding of Line A referring to the Chinese 60N rail profile can also improve the stability of the EMU during cross-line operation.