In this paper, a multi-disciplinary analysis method is proposed for evaluating the fatigue life of railway vehicle car body structure under random dynamic loads. Firstly, the hybrid fatigue analysis method was used with Multi-Body System simulation and finite element method for evaluating the carbody structure dynamic stress histories. The dynamics stress is calculated from the longitudinal load using longitudinal train dynamics. Secondly, the nonlinear damage accumulation model was used in fatigue analysis, and carbody structure fatigue life and fatigue damage were predicted. The mathematical model simulations are compared with results produced experimentally, showing good agreement. Finally, the mode is determined after the finite element model is established. To achieve the dynamic stress at each node, the modal response is used as excitation. The carbody damage was obtained by combining dynamics stress with the NMCCMF damage accumulation model. As a result, the effect of longitudinal load on carbody fatigue damage is investigated. The longitudinal load contributes significantly to the fatigue damage of the carbody.

本文提出了一种多学科分析方法，用于评估随机动态载荷下铁路车辆车体结构的疲劳寿命。首先，将混合疲劳分析方法与多体系统仿真和有限元方法结合使用，评估车身结构的动态应力历程。动态应力是使用纵向列车动力学从纵向载荷计算出来的。其次，采用非线性损伤累积模型进行疲劳分析，预测车体结构疲劳寿命和疲劳损伤。将数学模型模拟与实验产生的结果进行比较，显示出良好的一致性。最后，在建立有限元模型后确定模态。为了获得每个节点的动态应力，模态响应被用作激励。车体损伤是通过将动力学应力与 NMCCMF 损伤累积模型相结合获得的。因此，研究了纵向载荷对车身疲劳损伤的影响。纵向载荷对车体的疲劳损伤有显着影响。