地铁列车车轮不圆发展分析与优化方案

Analysis and optimization schemes on wheel roundness development

围绕佛山地铁2号线车轮不圆问题,利用镟床对现役3列列车的车轮径跳值进行测量跟踪研究,对比分析得出列车车轮不圆发展的总体特点。统计表明,同一时间段内不同列车车轮不圆发展的速度不尽相同,初始有较大不圆的车轮,其后期不圆发展速度普遍较快;前期曾出现不圆的车轮,经过镟修后仍保留以往的不圆发展趋势;随着公里数增加,车轮不圆发展速度有减缓趋势。同时为了解车轮详细特征进行车轮粗糙度测试,分析结果表明佛山地铁2号线车轮不圆的主要表现为踏面局部凹陷,与雨天发生的空转滑行问题有着较为密切的联系。结合以上特点,从避免踏面局部凹陷及调整镟修角度出发,提出解决车轮不圆问题的优化方案并进行验证,为业内其他地铁同行提供参考。

Addressing the concern of wheel out of roundness(OOR)on Foshan metro line 2,this article uses a lathe to measure and track the wheel roundness of three in-service trains,and conducts comparative analysis to obtain the general characteristics of wheel OOR development.The statistics reveal that during the same time period,different wheel OOR development speeds are not completely the same.Wheels with deeper initial roundness tend to exhibit a faster development rate in the later stages.Wheels that initially exhibited OOR tend to maintain the same development trend after reprofiling.Furthermore,as mileage increases,there is an observable tendency for the development speed of wheel OOR to slow down.In addition,a wheel roughness test was conducted to comprehensively understand the detailed characteristics of the wheel.The analysis results indicate that the main manifestation of wheel OOR on Foshan metro line 2 is a partial depression on the tread,which is closely related to the issue of idling and sliding during rainy days.Based on the identified characteristics,and in consideration of avoiding partial depressions on treads and changes in reprofiling angles,optimization schemes are proposed and verified to solve the issue of wheel OOR.These findings offer a valuable reference for other industry counterparts in the metro sector.