Abstract:  Aiming at the problem of frequent failure of components in hydro-pneumatic spring damper of new generation special vehicles, the internal flow field and the pressure field on the surface of key structural parts were studied through the finite element simulation of the structure. The mathematical model of the hydro-pneumatic spring was established, and the calculation formula of its damping force was derived based on its working principle. The damping structure and the surrounding oil flow field were modeled by 3D software, and the fluid structure coupling simulation was carried out based on ANSYS Workbench platform. The accuracy of the simulation model was verified by comparing with the experimental pressure difference test results, and the calculation results of the pressure and velocity of the oil flow field were obtained. The results show that the velocity and pressure distribution in the core flow field of the hydropneumatic spring damping structure are very uneven, the maximum velocity appears in the through hole, the maximum pressure appears in the big end side of the valve seat, the pressure difference is about 53.8MPa to open the valve, the pressure difference decreases sharply after opening the valve, and the pressure distribution on the coupling surface of the valve core is no longer uniform in the circumferential direction. This provides a certain reference for the followup reliability research and optimization design.

Key words:  hydro-pneumatic spring; damping valve; fluid-structure coupling; simulation model

WEN Hua-dian, LIU Zhen-tao, ZHAO Tao-shuo, et al. Damping structure characteristics of hydro-pneumatic spring for a special vehicle［J］.Journal of Mechanical & Electrical Engineering, 2021,38(9):1091-1098.