基于随机振动理论的我国中高速铁路有砟轨道设计轮载研究

Study on Designed Dynamic Wheel Loads of Middle-speed and High-speed Railways in China Based on Theory of Random Vibration

研究我国中高速铁路设计轮重。在考虑轨道高低和水平不平顺的基础上,采用德国高速低干扰谱与人工短波样本合成得到轨道随机不平顺样本,将轨道结构的扣件刚度和道床刚度作为随机参数。将两者共同作为车辆-轨道耦合振动系统的激励,应用Monte Carlo随机有限元方法,对轮轨动作用力进行研究。给出轮轨动作用力的概率分布特性及其随行车速度的变化规律,并提出在失效概率为0.05时我国中高速铁路设计动轮载和动力系数的建议值。当车速为160、200、250、300、350 km/h时,建议的动力系数分别为2.4、2.8、3.0、3.5、3.7。

Designed dynamic wheel loads are researched in respect of operation of middle-speed and high-speed railways in China.Vertical and cross irregularities of tracks are considered at the same time.Combining the sample of artificial short waves and the sample of low disturbance track irregularities of high speed railways in Germany,the simulated sample of stochastic track irregularities is established.Rail fastening stiffness and ballast stiffness are taken as random variables.Both the stochastic track irregularities and random track parameters are applied as excitation to the vehicle-track coupling vibration system and the Monte Carlo random finite element method（FEM） is adopted to study the dynamic wheel-rail forces.The results show the probability distribution property of dynamic wheel-rail contact forces and the changing law of dynamic wheel-rail forces against different train speeds.The designed dynamic wheel loads and dynamic coefficients are suggested for middle-speed and high-speed railways in China.When train speeds are 160,200,250,300,350 km/h,the corresponding suggested dynamic coefficient values are 2.4,2.8,3.0,3.5,3.7.