Study Of Automobile Shock Absorber Based On Fluid-structure Interaction Simulation

With the rapid development of China’s automobile industry， the users andmakers have higher and higher demands for the performance of automobiles.Automobile shock absorber is an important component of suspension system. Withthe better performance of suspension system， the automobile can improve goodperformance of power and mobility so that it has good driving operation，comfortable driving environment，low vibration and low noise. Therefore， thedamping characteristics of Automobile shock absorber are very important. With therapid development of computer technology， the simulation technology of the shockabsorber using finite element analysis software is important for the development ofhigh performance of Automobile shock absorber.Based on both the domestic and foreign research method of the shock absorber，the thesis has systemic research on the damping characteristics of the double-barreltype of shock absorber. According to the analysis on the structure characteristics，working process and the damping characteristics， make sure that the thesis uses thefluid-structure coupling simulation method to solve the problem. The thesis use theseparation method to solve the fluid-structure coupling system， that is，the fluid fieldis solved by finite volume method， and the solid structure is solved by finite elementmethod，and the data transmission between the fluid and structure is passed throughcoupling surfaces.According to the specific structure of shock absorber，the thesis builds thedetailed mathematical model. According to the working process of shock absorber，the shock absorber system is simplified into an equivalent hydraulic system.According to the hydraulic system，the thesis uses the method of the combination oflumped parameter and local distribution parameter to build the mathematical model.The main contents are as follows：Use the fluid-structure coupling simulation method to solve the dampingcharacteristics.Use the software of CATIA to build geometric models，then importgeometric models into ANSYS WorkBench，then use the module of DesignModeler to do the geometric processing. After that，use the software of HyperMesh to build meshmodels，finally use the platform of ANSYS WorkBench to do the fluid-structurecoupling simulation，get the total pressure contours and velocity vectors and analysethe results.Use the test to verify the simulation results of the damping characteristics.Comparing the simulation external characteristics with the experimental externalcharacteristics，analyse that whether the simulation models in this paper are corrector not， and the advantages and disadvantages of the simulation method in this paper.