To study the vibration characteristics and stress state of brake discs during vehicle operations, a spatial trailer car-track coupled dynamics model was developed with the consideration of flexible brake disc. In the model, the components of a trailer car are considered as rigid bodies. Flexible models of the brake disc and wheelset were established using the finite element method. The trailer car-track coupled dynamics model is validated using experimental test results. The effects of wheelset flexible deformation on the dynamic properties of brake discs were investigated with the excitations of track irregularity and wheel flats. Furthermore, the brake disc was systematically evaluated and discussed under the condition of wheel flats in the coupled dynamics system. The results indicate that compared to rigid wheelsets with wheel flats, flexible wheelsets can cause the brake disc to vibrate more severely with higher stress. The severe vibration and high stress state of the brake disc could cause it to crack in the region near the bolts. The established dynamics model can be further developed and employed to assess the dynamics of the brake systems of high-speed trains.

为研究车辆运行过程中制动盘的振动特性和应力状态，建立了考虑柔性制动盘的空间挂车-履带耦合动力学模型。在模型中，拖车的组件被视为刚体。采用有限元方法建立了制动盘和轮对的柔性模型。使用实验测试结果验证了拖车-轨道耦合动力学模型。研究了轮对柔性变形对制动盘动态特性的影响，并在轨道不平顺和轮平激励下进行研究。此外，在耦合动力学系统中，在车轮扁平条件下系统地评估和讨论了制动盘。结果表明，与带有轮平的刚性轮对相比，灵活的轮对会导致制动盘在更高的压力下振动更严重。刹车盘的剧烈振动和高应力状态可能导致其在靠近螺栓的区域开裂。建立的动力学模型可以进一步开发和用于评估高速列车制动系统的动力学。