地震环境下高速列车最大安全运行速度分析

为研究地震环境对高速列车运行速度的影响,以某型动车组为研究对象,建立高速列车动力学模型。采用"金井清-田治见宏模型"对地震地面运动进行模拟,将模型中的地震动功率谱转换成位移功率谱,并求解出地震动的传递函数,将地震激励通过传递函数以位移的形式输入高速列车动力学模型中。以地震烈度7度为例,从脱轨系数、轮重减载率、轮轴横向力等动力学性能指标对不同速度等级下的高速列车进行动力学分析,并得到一个高速列车最大安全运行速度的参考值。分析结果表明,在地震动作用下,高速列车运行速度的大小对其动力学性能有着不可忽视的影响,并且通过对比不同速度等级下高速列车的动力学性能指标,得出在地震烈度为7度时高速列车最大安全运行速度为50 km/h,对列车在突发地震时运行速度的调整具有一定的参考价值。

Maximum Safe Running Speed of High Speed Train in Seismic Environment

In order to study the influence of seismic environment on the running speed of high speed train,a dynamic model of high speed train is established with a certain type of EMU selected as the research object.The Kainai-Tajimi model is used to simulate the ground motion.The power spectrum of ground motion in the model is converted into the power spectrum of displacement,and the transfer function of ground motion is solved.The seismic excitation is input into the dynamic model of high speed train in the form of displacement through the transfer function.Taking seismic intensity of 7 degree as an example,the dynamic analysis of high speed train under different speeds is carried out from the dynamic performance indexes such as derailment coefficient,wheel load reduction rate and wheel-axle lateral force,and a reference value of maximum safe running speed of highspeed train is obtained.The results show that under the action of earthquake,the speed of high speed train has an important influence on its dynamic performance.By comparing the dynamic performance indexes of high speed train under different speed grades,the maximum safe running speed of high-speed train is 50 km/h when the intensity of earthquake is 7 degrees,which could serve as reference for adjustment to train speed in sudden earthquake.