Research On Robust Design Of Passive Suspension Space Structure Based On Multi-objective Optimization

With the development of the automobile industry,the role of the vehicle suspension system in the various systems of the automobile is becoming more and more important.Whether it has good dynamic and kinematic performance affects the vehicle’s handling stability,ride comfort and safety and so on.Therefore,it is necessary to study the advanced design concept and technology of suspension system in improving vehicle handling stability,ride comfort and safety.In recent years,in the field of automobile design,the majority of experts and scholars pay more and more attention to robust design.In this paper,the robust design is used in the design of spatial structure parameters of the passive suspension,which not only eliminates the shortcomings of the traditional deterministic optimization design,but also improves the stability of the dynamic performance of suspension system.Firstly,the development of robust design and its application status in automobile industry are elaborated,and the basic theory and method of robust design are systematically introduced.After the structure of a certain vehicle is reasonably simplified,the vehicle virtual prototype is established by ADAMS software,including front and rear suspension systems,steering system,chassis,tire model and road model.The parameterized virtual prototype model of the vehicle is established based on the parameterized design of the vehicle model.Considering the stability and ride comfort of the vehicle,the three performance parameters of vertical acceleration,wheelbase and roll angle are selected as the optimization target.Based on the ISIGHT multidisciplinary optimization software,the Taguchi robust design method and the robust optimal design method based on the response surface model are used to study the multi-objective robust optimization design of the suspension spatial structure parameter,which improves the robustness of the dynamic performance of the suspension system.And then Monte Carlo method is used to analyze the robustness of the two robust design methods,so as to get the most stable combination of the spatial structure parameters of the suspension system.Finally,the results of the robust design are input into the vehicle parameterized model to performing simulation tests,which verifies the robustness of the robust optimization design.