Study on High-frequency Vibration Characteristics of High-speed Railway Fastener System

In order to explore the dynamic stiffness characteristics of the high-speed railway fastening system under low temperature and high frequency conditions,Taking the existing WJ-7B and WJ-8B fasteners as the research object, firstly, a test method and theoretical model to determine the overall dynamic stiffness of the fastening system are proposed. Secondly, the simulation models of the two fasteners are established, and the model was verified with the test results. Finally, the overall dynamic stiffness characteristics of the fastener and the influence of the clip on the overall dynamic stiffness are simulated and analyzed according to the establishend modal.The results show that the dynamic stiffness of WJ-7B is greatly affected by frequency. The dynamic stiffness at 950 Hz is 15-19 times higher than that at 100 Hz; The dynamic stiffness of WJ-8B fasteners is more affected by temperature, Under-50 ℃The dynamic stiffness of the WJ-8B is 23 times greater than that at 10 ℃; The dynamic stiffness of the WJ-8B fastener is much lower than the dynamic stiffness of the railpad at the first resonance frequency, This order of resonance frequency is caused by the mass-spring system composed of the baseplate and the railpad. The overall dynamic stiffness of WJ-7B fasteners is close to the dynamic stiffness of the railpad; and the deformation of the clip has little effect on the overall high-frequency dynamic stiffness of the fastener.