Optimal Design of Isotropic Stiffness for Rubber Bushing by Considering Material Hardness and Diameter Reduction for Conveyance
[Objective]As an important connecting part of new energy vehicles,special vehicles,locomotives and other means of transportation,rubber bushing plays a crucial role in the stability of the whole vehicle han-dling.In order to avoid the tedious work of repeated debugging in engineering practice,[Method]an optimal de-sign method of rubber bushing all-directional stiffness(radial,axial,yaw and torsional stiffness)taking into ac-count the material hardness and diameter reduction is proposed.Firstly,the Ogden model is used as the constitu-tive model of rubber bushing.Second,by combining experimental design with finite element analysis,the isotro-pic stiffness of rubber bushing with different inner core outer diameter,rubber height,diameter reduction and ma-terial hardness is calculated.The second-order response surface model of isotropic stiffness is established and the accuracy of the model is verified by Latin hypercube sampling and variance analysis.Finally,a multi-objective optimization method of isotropic stiffness of rubber bushing is proposed using genetic algorithm to testify the op-timization result.[Result]The result shows that the relative errors between the measured radial,axial,yaw and torsional stiffness and objective stiffness are 7.72%,9.06%,-6.33%and 9.16%respectively,which are all within±10%and meet the requirements of engineering application.[Conclusion]The validity of the established sec-ond-order response surface model of isotropic stiffness and the feasibility of the proposed optimization design method are verified to provide guidance for the product design of rubber bushing,which can greatly shorten the research and development cycle of rubber bushing.
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