高速列车减振器活塞预紧力对阻尼特性影响的研究

为探究动车组减振器检修过程中预紧力对试验结果的影响，以某型号抗蛇行油压减振器为研究对象，通过构建减振器活塞阻尼阀三维模型和流量力学模型，分别用ANSYS和MATLAB/Simulink软件联合仿真，改变预紧力参数得出阻尼阀流体力学变化及减振器阻尼特性曲线。结合减振器阻尼试验台对仿真结果进行论证，分析活塞阻尼阀预紧力对减振器阻尼影响。通过试验对比得出：在速度未达到阀口开启条件时，阻尼阀预紧力的变化不会对减振器的阻尼力值产生影响；仅当速度值达到阻尼阀开启条件时，预紧力变化才会影响减振器的阻尼特性，拉伸和压缩阻尼力均随着阻尼阀预紧力的增加而增加。

Research on the Influence of Piston Preload on Damping Characteristics of High-Speed Train Anti-hunting Damper

In order to implement the independent maintenance requirements of China Railway Group,a study was conducted on the influence of preload on test results during EMU shock absorber maintenance.A certain type of anti-hunting oil pressure shock absorber was taken as the research object,and 3D and flow mechanics models were constructed for the piston damping valve of the shock absorber.Co-simulation software ANSYS and MATLAB/Simulink were utilized to modify preload parameters in order to obtain fluid mechanics changes in the damping valve and damping characteristic curves of the shock absorber.The simulation results were validated using a damper bench,and an analysis was performed on how piston damper valve preload affects damper damping.The test results indicate that when speed does not reach the opening condition of the valve port,changes in damping valve preload do not affect the damping force value of the shock absorber;only when speed reaches this opening condition does preload modification impact damping characteristics;tensile and compressive damping forces increase with an increase in damping valve preload.