In order to analyze the characteristics of wheel-rail vibration of the vertical section in a high-speed railway, a vehicle-line dynamics model is established using the dynamics software SIMPACK. Through this model, th...In order to analyze the characteristics of wheel-rail vibration of the vertical section in a high-speed railway, a vehicle-line dynamics model is established using the dynamics software SIMPACK. Through this model, the paper analyzes the influence of vertical section parameters, including vertical section slope and vertical curve radius, on wheel-rail dynamics interaction and the acting region of wheel-rail vibration. In addition, the characteristics of wheel- rail vibration of the vertical section under different velocities are investigated. The results show that the variation of wheel load is not sensitive to the vertical section slope but is greatly affected by the vertical curve radius. It was also observed that the smaller the vertical curve radius is, the more severe the interaction between the wheel and rail be- comes. Furthermore, the acting region of wheel-rail vibration expands with the vertical curve radius increasing. On another note, it is necessary to match the slope and vertical curve radius reasonably, on account of the influence of operation speed on the characteristics of wheel-rail vibration. This is especially important at the design stage of vertical sec- tions for lines of different grades.展开更多
为了精确预测钢轨磨耗,以及为工务部门进行钢轨打磨和线路维护提供指导,建立了城市轨道交通车辆-轨道耦合动力学模型,采用Hertz-FASTRIP(FastStrip)-USFD(University of sheffield)模型对钢轨磨耗进行了计算,对城市轨道交通线路曲线段...为了精确预测钢轨磨耗,以及为工务部门进行钢轨打磨和线路维护提供指导,建立了城市轨道交通车辆-轨道耦合动力学模型,采用Hertz-FASTRIP(FastStrip)-USFD(University of sheffield)模型对钢轨磨耗进行了计算,对城市轨道交通线路曲线段钢轨磨耗的演变规律进行了预测。结果表明:LM型踏面与60 kg/m钢轨(以下简称“60钢轨”)接触时,其轮轨接触区域较大,且横移量较大时轮缘接触频繁。LM型踏面与60D钢轨接触时,其轮轨接触点在轨顶区域比较集中;相较60钢轨接触,其等效锥度更小,有利于车辆稳定运行;轮轨接触点集中在滚动圆附近,轮对横移量小于7 mm时,接触斑面积较小,法向应力较大,磨耗功较小。60D钢轨减轻了曲线外侧钢轨磨耗,且其在曲线外侧磨耗整体小于60钢轨。通过总重为5 Mt时,缓和曲线段60D钢轨最大磨耗深度为0.48 mm,相比60钢轨减小44.18%;圆曲线段60D钢轨最大磨耗深度为1.43 mm,相比60钢轨减小22.7%。60D钢轨可以进一步改善轮轨接触关系,并有效减小城市轨道交通线路曲线段的钢轨磨耗。展开更多
基金support and motivation provided by the National Natural Science Foundation of China (No. 51075340)the Fok YingTong Education Foundation for Young Teachers in the Higher Education Institutions of China (No. 121075)the Program for Innovation Research Team in University in China (No. IRT1178)
文摘In order to analyze the characteristics of wheel-rail vibration of the vertical section in a high-speed railway, a vehicle-line dynamics model is established using the dynamics software SIMPACK. Through this model, the paper analyzes the influence of vertical section parameters, including vertical section slope and vertical curve radius, on wheel-rail dynamics interaction and the acting region of wheel-rail vibration. In addition, the characteristics of wheel- rail vibration of the vertical section under different velocities are investigated. The results show that the variation of wheel load is not sensitive to the vertical section slope but is greatly affected by the vertical curve radius. It was also observed that the smaller the vertical curve radius is, the more severe the interaction between the wheel and rail be- comes. Furthermore, the acting region of wheel-rail vibration expands with the vertical curve radius increasing. On another note, it is necessary to match the slope and vertical curve radius reasonably, on account of the influence of operation speed on the characteristics of wheel-rail vibration. This is especially important at the design stage of vertical sec- tions for lines of different grades.