双筒液力减振器节流特性试验和仿真研究  

Test and Simulation Research on Absorber's Throttling Characteristics

作　　者：吴英龙[1,2] 赵华[1] 王萌[1] 张国刚 

机构地区：[1]西南交通大学力学与工程学院,成都610031 [2]四川宁江精密机械有限公司基础研究所,成都610101

出　　处：《上海理工大学学报》2013年第3期275-280,共6页Journal of University of Shanghai For Science and Technology

基　　金：国家自然科学基金资助项目(11172249)

摘　　要：为了解减振器的节流特性及阻尼力异常波动的原因,试验和仿真研究了减振器液压变化历程和阀片受力过程.设置子循环能减少计算量,同时会造成液压剧烈波动的假象.经拟合处理,设置子循环的液压速度过程曲线能表示阻尼力速度特性.开阀前,118减振器的节流由常通孔决定;开阀后由阀片与活塞间的缝隙决定.阀片的应力分布明显分为3层,不能认为阀片全面积受均匀分布的液压作用.结果表明:阀片与弹簧座接触方式的转变是造成异常波动的原因.In order to understand the throttling characteristics and the damping force abnormal fluctuations, tests and simulations were carried out on the course of pressure change and the force process acting on valve disc of a hydraulic shock absorber. Setting sub-cycle can reduce the amount of calculation, however, it will cause the pressure＇ s unreal fluctuations. Mter fitting, the simulated curve of pressure vs velocity with sub-cycle setting can represent the velocity characteristics of damping force. For the 118 shock absorber, the throttle orifice decides the throttling characteristics before the valve opens and the gap between valve disc and piston decides the throttling characteristics after the valve opens. Three obvious layers appear in the stress distribution of the valve disc, so the uniform distribution hypothesis isn＇t appropriate. The results show that, the change of contact form between valve disc and its saddle is one of the causes which induce the damping force abnormal fluctuations.

关 键 词：减振器 节流特性 流固耦合 波动 

分 类 号：U464.33[机械工程—车辆工程] O322[交通运输工程—载运工具运用工程]