Influence of fluid pressure on the fluidsolid coupling vibration characteristics of pipeline
                                                      AN Chenliang1, MA Jinyu2, WANG kuoqiang3
(1.Beijing Institute of Space Launch Technology, Beijing 100076, China; 2.Beijing Precision Mechanical and Electrical Control Equipment Research Institute, Beijing 100076, China; 3.Yanshan University,School of Mechanical Engineering, Qinhuangdao 066004, China)

Abstract: Aiming at the fluid power transmission system with high pressure and large flow pipe system development trend of fluid solid coupling vibration, fixed the problem that hydraulic straight pipe and a certain type of aircraft wing bending pipe FSI vibration characteristic were studied, an exact numerical solution for transfer matrix model of fluid solid coupling 14 equation considering friction term was proposed. The effect of fluid pressure on fluid solid coupling dynamic behavior was analyzed. A fluid solid coupling vibration test platform for hydraulic pipeline was set up, the axial velocity response of pipeline under different pressure was tested, the error between the results and the numerical analysis is less than 10%, the correctness of the numerical solution method was verified. The results indicate that pressure has little influence on pipeline vibration characteristics. The results obtained lays the foundation for the study of fluidsolid interaction dynamics of complex hydraulic pipe under superposition load.

Key words: hydraulic piping; fluidstructure coupling vibration; frictional coupling; frequency domain characteristics