| With the rapid development of domestic heavy automobile industry, the importanceof suspension system that affect the riding comfort and handing stability of vehicle hasbecome increasingly prominent. In order to obtain good damping effect, new types ofsuspension were continuously applied to heavy vehicle, especially the rubbersuspension attracted more and more attention for its series of features include lightweight, maintenance free and superior performance. This paper did finite elementanalysis and structural optimization for the rubber suspension of heavy vehicle offeredby some automobile enterprises, based on the finite element method and topologyoptimization theory.Firstly, the three-dimensional solid model of rubber suspension was built in UGsoftware and the structure of balance beam and connectivity shaft bracket wereimported HyperMesh to built the finite element analysis model. Then its static structureanalysis was done on four typical working conditions. The results showed that the stressof most of structure area satisfy its strength requirement, but the maximum stress thatappearing at the end of balance beam and connectivity shaft bracket was too large onturning and torsion condition.Appling the method of getting the Mooney-Rivlin constitutive model parametersbased on rubber hardness, three different groups of material parameters were obtainedby the measured assistant spring hardness. Then nonlinear finite element analysis of theassistant spring was done with the different parameters. Comparing the finite elementresults and the test data of assistant spring stiffness characteristic, the rubber materialparameters of most consistent test curve were determined. So the more precise nonlinearfinite element analysis model of rubber suspension was built, for researching itsnonlinear stiffness characteristic.Setting the connectivity shaft bracket as design space, the appropriate optimizationparameters were chose by topology optimization of the rubber suspension on bendingcondition. Then multi-objective topology optimization analysis for the rubbersuspension was carried out based on compromise programming theory. Extracted theoptimization result and analyzed the new finite element model, the results showed thatthe weight of bracket reduced and the maximum stress decreased on torsion and turningcondition. |
