基于液-固耦合有限元分析方法的气-液型减振器补偿阀性能研究

FSI FEA SIMULATION OF LIQUID-SUPPLEMENT VALVES IN GAS-PRESSURIZED HYDRAULIC DAMPERS

通过实验和有限元模拟,对比分析了轿车悬架双筒式气-液型减振器的两种典型结构的油液补偿阀工作性能的差异。利用ADINA有限元分析软件分别建立了两种补偿阀的结构动力学模型和流体动力学模型,进行了油液补偿阀的液-固耦合动态响应计算分析,得到了两种补偿阀的非线性节流特性、流场特性以及补偿阀阀片的动态响应特性。分析表明,两种补偿阀的节流孔结构不同,导致二者的补偿能力具有较大的差异,从而使得此二种减振器的空程性畸变临界速度点具有较大差异。当流量较大时,节流孔的节流作用对补偿阀的性能影响较大,通过合理设计节流孔结构,可以有效地提高双筒式气-液型减振器的空程性畸变临界速度点,提高减振器的高速工作性能。

Two typical liquid-supplement valves in double-tube gas-pressurized hydraulic dampers of car suspension are compared with each other by experiments and finite element simulations. Three-dimensional Fluid-Structure Interaction models of the two liquid-supplement valves are set up with the Finite Element Analysis code ADINA. The working characteristics, transient fluid pressure and velocity distribution of each valve, as well as the kinematical response of the valve disc, are simulated using the ADINA FSI module. The difference between the orifice structures of this two liquid-supplement valves leads to obvious difference in liquid-supplement capacity between them, which shows that the critical velocity of the performance degradation of a liquid valve can be increased by improving the design of orifice structure.