Out-of-round (OOR) wheel often happens to trains, which can cause abnormal vibration. To develop effective countermeasures to minimize the abnormal vibration, it is necessary to study how the wheel OOR wear affects the vehicle vibration. This paper performs an experimental study on the abnormal vibration characteristics of metro trains with out-of-round wheels. The vibration characteristics is identified by the general survey of wheel roughness from special tests. The statistic wheel wear values of all the vehicles in an operating metro lines are studied to investigate the relationship between the wheel wear and the operating mileage. Several re-profiling strategies are implemented to eliminate the abnormal vibration caused by wheel OOR. The results show that the root cause of the abnormal vibration and deterioration of ride comfort is the car-body flexible resonance excited by the wheel OOR wear. Wheel re-profiling is the most effective measure for reducing the vehicle abnormal vibration. By re-profiling all the wheels of a tested metro vehicle, the ride comfort can be improved by 35% ∼ 40% and the axle-box acceleration can be reduced by 40%.

中文翻译：

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车轮失圆引起地铁列车异常振动的实验研究

不圆（OOR）车轮经常发生在火车上，这会导致异常振动。为了制定有效的对策来减少异常振动，有必要研究车轮OOR磨损如何影响车辆振动。本文对车轮不圆的地铁列车异常振动特性进行了实验研究。振动特性是通过对特殊测试的车轮粗糙度的一般调查来确定的。研究了运营地铁线路中所有车辆的车轮磨损统计值，以研究车轮磨损与运营里程之间的关系。实施了几种重新仿形策略以消除由车轮 OOR 引起的异常振动。结果表明，异常振动和乘坐舒适性恶化的根本原因是车轮OOR磨损激发的车身柔性共振。车轮重整型是减少车辆异常振动的最有效措施。通过对被测地铁车辆的所有车轮进行重新轮廓分析，乘坐舒适性可提高 35% ∼ 40%，轴箱加速度可降低 40%。