In view of the coexistence of wheel profile wear (WPW) and wheel diameter difference (WDD) on an actual subway line, a dynamic analysis method based on coupling between WPW and equivalent in-phase WDD was proposed. Based on the measurements from a subway vehicle in operation on this line, dynamics modeling and calculations were performed for a single carriage of this vehicle. Later, the interaction between the effects of WPW and equivalent in-phase WDD on the vehicle dynamic performance was analyzed, and the dynamic response in the presence of coupled damage was compared between the outer and inner wheels. Furthermore, the difference in the dynamic response caused by different positions of the larger-diameter wheels (i.e., on the inner track or outer track) was analyzed for the case where equivalent in-phase WDD occurred between the front and rear bogies. The results show that when the vehicle ran on a straight line, the coupling between WPW and WDD reduced the vehicle’s stability but improved its ride comfort. When the vehicle traveled on a curved line, it showed reductions in the lateral wheel/rail contact force, derailment coefficient, axle lateral force, and wear index if the outer wheels had a larger diameter. As a result, the deterioration of the vehicle’s dynamic performance due to the increasing degree of WPW slowed down, and its curve negotiation performance improved. Meanwhile, the outer wheels had significantly greater lateral wheel/rail contact force, derailment coefficient, and wear index compared to the inner wheels. When a −1 mm WDD was coupled with the worn wheel profile for 14 × 10⁴ kilometers traveled, the dynamic performance indexes of the vehicle were close to or even exceeded the corresponding safety limits. The findings can provide technical support for subway vehicle maintenance.

中文翻译：

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轮廓磨损与轮径差耦合对地铁车辆动态性能的影响

【摘要】：针对某地铁实际线路中轮廓磨损(WPW)和轮径差(WDD)并存的问题,提出了一种基于WPW与等效同相WDD耦合的动力学分析方法。根据在这条线路上运行的地铁车辆的测量结果，对该车辆的单节车厢进行了动力学建模和计算。随后，分析了WPW和等效同相WDD对车辆动态性能的影响之间的相互作用，并比较了外轮和内轮在耦合损坏情况下的动态响应。此外，由大直径车轮的不同位置引起的动态响应的差异（即，在内轨道或外轨道上）针对前后转向架之间发生等效同相 WDD 的情况进行了分析。结果表明，当车辆直线行驶时，WPW和WDD之间的耦合降低了车辆的稳定性，但提高了其乘坐舒适性。当车辆在曲线上行驶时，如果外轮直径较大，则表明轮轨侧向接触力、脱轨系数、车轴侧向力和磨损指数降低。因此，车辆由于WPW增加程度而导致的动态性能恶化减缓，弯道通过性能得到改善。同时，与内轮相比，外轮具有显着更大的横向轮轨接触力、脱轨系数和磨损指数。^行驶4公里，车辆动态性能指标接近甚至超过相应的安全限值。研究结果可为地铁车辆维修提供技术支持。