应用刚柔耦合系统动力学方法,将铁道车辆关键零部件如客车转向架构架、货车转向架交叉杆组成等作为柔性体,通过模态综合方法融合在车辆多体动力学模型中,再通过车辆动力学仿真分析,获得关键部件上危险点的动应力。根据整个寿命周期内车辆不同运用工况的组合,获得相应危险点上的动应力谱,最后应用疲劳损伤准则,进行疲劳寿命计算。作为算例,应用该方法对配装转K6型转向架的交叉杆组成进行了疲劳寿命评估。 The rigid-flexible coupling system dynamics method is adopted to integrate the key components of railway vehicles, such as the bus bogie frame and the truck bogie crossbar composition, into a multi-body dynamic model through the modal synthesis method and then through the vehicle Dynamic simulation analysis, to obtain critical components of the dangerous dynamic stress. Based on the combination of vehicle operating conditions over the entire life cycle, the dynamic stress spectrum at the corresponding dangerous point is obtained. Finally, the fatigue damage criterion is applied to calculate the fatigue life. As an example, this method is used to evaluate the fatigue life of the crossbar assembly with K6 bogie.