Finite Element Analysis And Reconstruction Calculation Of Dynamic Characteristics Of Valve Slice In Automobile Hydraulic Shock Absorber

Shock absorber is a key component of vehicle suspension. The generation of dampforce and the performance in shock absorber are dependent on the dynamiccharacteristics of internal valve slice, so the design optimization and abnormal soundcontrol research of shock absorber are both inseparable from the deep and carefulanalysis research of dynamic process and characteristics in valve plates.Based on the double cylinder shock absorber as an example, With ANSYS CFXand ICEM as analysis tools, this paper focus on the stimulation and ansysization of themotion characteristics of valve plate and internal flow field, pressure field,velocity fieldof shock absorber during the stretching progress of the shock absorber. The maincontents of this paper include:①Dynamic calculation theory and method of double cylinder shock absorberwas analyzed. Comparison and analysis between parameter method and non-parametricmethod, which were broadly used in analogue simulation of shock absorber both athome and abroad, was made. and finally set the non-parametric method as thesimulation method in this paper. Comparison among characteristics of fluid-solidcoupling、dynamic mesh and mesh reconstruction methods which were included innon-parametric method was made, and based on their advantages and disadvantages, themesh reconstruction method was selected as the dynamic analysis method of the throttleslice.②Deeply analysis of the key technology in other similar models was made. Andaccording to the characteristics of the model in this paper, specific processing method ofthis model were established. Advantages and disadvantages of hexahedron mesh andtetrahedron mesh as well as the mesh selection strategy were analyzed. Thecharacteristics of hybrid mesh, division mesh and pure hexahedral mesh werecompared. And combined with the characteristics of the model in this paper, purehexahedral mesh structure was finally established as the meshing method.③A simplified principle model was proposed to pre-verify the model because ofthe complexity of the model which makes it error-prone in calculation. The limitdisplacement function was made which aimed at the motion characteristics of valveplate. The function language of the valve plate was compiled based on the combinationof the mechanical model of valve plate and mesh reconstruction method. A feasible verified model was obtained through the verification of the principle model with CFXand ICEM CFD reconstruction method④Based on the feasibility of principle model, the corresponding technicalprocessing has been made particularly to the real sample, so as to the simulativecalculation. Time displacement curve of plate was extracted in the result.Follwed bythe dynamic characteristics of plate and inner velocity field, flow field and pressurefield of Shock absorber.