40 t轴重重载铁路曲线超高对行车性能的影响规律分析

Analysis of Influence of Curve Superelevation on Running Performance of 40 t Axle Load Heavy Haul Railway

为探究40t轴重重载铁路未平衡超高的合理取值,基于多体系动力学软件UM建立40t轴重四编组列车动力学模型,从行车安全性、轮轨磨耗和疲劳损伤三个角度,计算分析未平衡超高对列车运行性能的影响。研究结果表明:过大的欠超高或过超高会导致安全性指标增大,不利于列车行车安全;纵向压钩力会加剧曲线段的轮轨动力作用,特别在较大欠超高工况下,纵向压钩力会造成轮轴横向力的增加幅度更为显著;欠超高越大,越有利于降低外轨侧轮轨磨耗和钢轨疲劳损伤,但同时会增加内轨侧轮轨磨耗。综合考虑,建议设置适当的欠超高,既可提高列车运行安全性,又能减缓轮轨磨耗和疲劳损伤。

In order to explore the reasonable value of the unbalanced superelevation of the 40t axle load railway,a four-wagon formation train model of 40 t axle load is established based on the multi-body system dynamics software UM,and the influence of the unbalanced superelevation on the train running performance is analyzed from the three perspectives of running safety,wheel-rail wear and fatigue damage.The research results show that excessive deficient or surplus superelevation will increase the safety indexes,which is not conducive to the train running safety.The longitudinal press force will intensify the wheel-rail dynamic interaction,and cause significantly more increase of the lateral wheelset force especially under deficiency superelevation condition.The greater the deficiency superelevation,the more beneficial it is to reduce the wheel-rail wear and the fatigue damage of the outer rail,but it will increase the wheel-rail wear of the inner rail.All things considered,it is recommended that setting appropriate deficiency superelevation could not only improve the safety of train operation,but also reduce the wheel-rail wear and fatigue damage.