CFD Simulation For Train Hydraulic Damper

The locomotive and car wheel is connected with the rail surface hardly. If there is irregularity on the rail surface or the wheel, it may cause low and high frequency vibrations on the suspensions by the wheel. Unless the vibrations are attenuated by the damper, there must be decreased in the structure intensity, service life and running quality. And what said before are all going against to the security, economic and comfort of the train.The hydraulic dampers have been used on the locomotive, railway passenger for more than forty years. In the previous30years, they all work with the domestic dampers. But along with the rapid development of China railway construction, the imported products have been implied on the high-speed locomotives and passengers. This mainly because of domestic dampers exposed the questions of leaking oil, noisy and even the invalidation what can’t meet the requirement of the high-speed locomotives such as comfort, safety and running smoothly. At the present, the design of the hydraulic damper in our country is still using the imported test-beds to finish its performance testing. But they all require the qualified damper which needs to expend a large amount of resources and time. Internal flow characteristics of hydraulic damper were analyzed by finite element method in this paper. This subject studies of the primary vertical hydraulic damper. By doing deep research on the structure and its operating principles, the vibration velocities have been got. Internal flow models have been done in the software Pro/E. By using ANSYS ICEM and STAR-CD, the finite element models of the damper internal flow are also finished. At last, three-dimension numerical simulation for it is done in the software ANSYS CFX.The finite element simulation analysis of the hydraulic damper can make its operating principles easier to understand. And the numeric result was in good agree with that of experiment. What’s all, this will applies a perfect tool for the structure optimization and performance analysis of damper which may accelerate the localization process of the train damper.