Damage of rail fastening system often occurs due to severe vehicle-track dynamic interactions. To evaluate the dynamic performance of the rail fastening system subject to dynamic interactions between vehicle and track, a refined vehicle-track coupled dynamics model involving an elaborated model of rail fastening clip (RFC) is developed in this work. Firstly, the RFC model is established based on the mode superposition method by which the difficulty in deducing dynamics equation due to the complex shape of RFC can be easily resolved. Then, the mode shape vectors and natural frequencies of RFC which required by the mode superposition method are obtained through a numerical modal analysis, and verified by a modal test. Finally, through the contact relationship between RFC and rail, the RFC model is implemented into the vehicle-track coupled dynamics model. The reliability of the proposed model is supported by a field test data, and the dynamic performances of rail fastening systems along the track subject to vehicle-track dynamic interactions can be efficiently and effectively evaluated. By applying the proposed model, the influences of rail corrugations, vehicle speeds, and rail pad stiffness on dynamic performances of the rail fastening system are evaluated in detail.

钢轨扣件系统的损坏往往是由于严重的车辆-轨道动态相互作用而发生的。为了评估受车辆和轨道之间动态相互作用影响的铁路扣件系统的动态性能，在这项工作中开发了一个精细的车辆-轨道耦合动力学模型，其中涉及一个详细的铁路扣件夹 (RFC) 模型。首先，基于模态叠加法建立RFC模型，轻松解决了RFC形状复杂导致动力学方程推导困难的问题。然后，通过数值模态分析得到模态叠加法所需的RFC振型向量和固有频率，并通过模态试验验证。最后通过RFC和rail的联系关系，RFC模型被实施到车辆-轨道耦合动力学模型中。所提出模型的可靠性得到现场试验数据的支持，并且可以有效地评估沿轨道受车辆-轨道动态相互作用影响的轨道扣件系统的动态性能。通过应用所提出的模型，详细评估了轨道波纹、车辆速度和轨垫刚度对轨道扣件系统动态性能的影响。