轮轨型面对车辆曲线通过性及磨耗影响

Wheel/Rail Profiles’ Effects on Vehicle Curving Behaviors and Wear

摘要:

对比初始与实测轮轨型面对上海地铁A型车的曲线通过性能的影响，并分析不同的轮轨型面匹配对轮轨磨耗、钢轨波浪形磨耗、接触疲劳的影响.结果表明4种不同的轮轨匹配下，车辆的曲线通过性能都能满足车辆动力学性能要求，但新车轮运行在已磨损的轨面上时，曲线通过性能略差，其轮轨横向力和脱轨系数偏高.初始轮轨匹配在过小半径曲线时其外轮轨具有较大的自旋功，且内外轮轨上高的纵向蠕滑率将导致车轮产生粘滑振动，易形成波磨，经过滚动接触疲劳分析，磨损后的车轮踏面易对小半径曲线外轨造成表面接触疲劳破坏.

Abstract:

The effects of the measured and the designed wheel/rail profiles on Shanghai Metro’s curving behaviors, flange wear, rail wear, corrugation, rolling contact fatigue (RCF) were investigated by modeling a nonlinear vehicle model. The results show that curving behaviors in all four wheel/rail matches satisfy the vehicle dynamics requirements, but the curving behaviors in the designed wheel profile and worn rail profile are less satisfactory. Wheel climbing ratio and value of wheel guiding force in this kind of wheel/rail match are higher. The spinning power of LM/UIC60 on outer rail is very high, leading to side wear of outer rail. The high longitudinal creepages on LM/UIC60 which the outer locates on the negative section of creep force creepage curve and the inner is around saturated point cause stick slip fluctuation easily, then forming corrugation. Besides, by analyzing the RCF, the worn wheel profile damages the outer rail on sharp curve.