Geometric design method of wheel profile for improving wheel and rail contact status
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摘要: 改进了车轮型面设计方法, 给出了设计方法的解析数学表达式, 将轮对等效锥度与轮轨型面接触状态联系起来, 对设计实例进行了轮轨几何接触、非赫兹滚动接触和车辆动力学性能分析。研究结果表明: 轮轨接触点能够均匀分散分布; 由于接触斑面积增大约23%, 最大接触压力降低约21%, 使轮轨滚动接触应力降低了约20%;装备实例型面的车辆临界速度与LMA型面几乎相同, 由于轮对等效锥度略有提高使其曲线通过性能略好于后者。可见, 该方法可以改善轮轨接触状态, 有利于轮轨型面均匀磨耗及缓解轮轨滚动接触疲劳。Abstract: The geometric design method of wheel profile was improved, its analytic mathematic expressions were presented, which connected wheelset equivalent conicity and wheel and rail contact status. The wheel and rail contact geometry, non-Hertzian rolling contact and vehicle dynamics performance of design example were calculated. Analysis result indicates that wheel and rail geometric contact points become homodisperse. Due to contact patch area increases by about 23%, the maximum contact pressure decreases by about 21%, wheel and rail rolling contact stress decreases by 20% approximately. Vehicle equipped with the example profile has nearly the same critical speed with LMA wheel profile, and because wheelset equivalent conicity has a little bit increase, the example profile exhibites better curving performance than the latter. So the method can improve wheel and rail contact status, which is beneficial to wheel and rail wear spreading, and is helpful to mitigate wheel and rail rolling contact fatigue.
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