高速运行下浮置板轨道垂向振动特性研究

Study on vertical vibration characteristics of floating slab track under high-speed operation

建立了钢弹簧浮置板轨道系统的刚柔耦合模型,并在60和120 km/h两种速度工况下进行仿真计算,探索车辆行驶速度的提升对钢轨、浮置板的动力响应及车辆运行安全性、平稳性的影响。结果表明:车辆行驶速度的提升对钢轨、浮置板的垂向振动加速度影响显著,加速度峰值分别增长91.5%、122.5%;行驶速度对钢轨、浮置板垂向位移的影响较小,位移分别增加8.0%、9.2%;在高速工况下,脱轨系数增大164%,车辆运行安全性显著降低,车辆运行平稳性变化不明显,所设置的钢弹簧浮置板轨道参数能满足车辆运行安全性、平稳性要求。

The rigid flexible coupling model of the steel spring floating slab track system is established,and the simulation calculation is carried out under the two speed conditions of 60 and 120 km/h,to explore the influence of the increase of vehicle speed on the dynamic response of the rail and floating slab,as well as the driving safety and stability.The results show that the increase of vehicle speed has a significant effect on the vertical vibration acceleration of rail and floating slab,and the peak acceleration increases by 91.5%and 122.5%respectively.The vertical displacement of rail and floating slab increases by 8.0%and 9.2%respectively;Under the high-speed condition,the derailment coefficient increases by 164%,the driving safety decreases significantly,and the change of vehicle operation stability is not obvious.The set steel spring floating slab track parameters can meet the requirements of driving safety and stability.