A SUV Subframe Based On Orthogonal Experimental Design Multi-objective Topology Optimization

In recent years,CAE technology in the car development process which plays a very important role.This paper is based on a SUV front subframe for topological optimization design.Firstly,the importance of topology optimization is discussed,and the research status of topology optimization technology at home and abroad is summarized.Then the finite element model of the front subframe is established in the finite element software Hypermesh,and the strength analysis and modal analysis are carried out.The results show that the front subframe satisfies the safe use requirement.And then according to the original sub-frame to determine the topology of the optimal design space,the constraints of the load reference to the original sub-frame.Next.In the Optistruct,the static topology optimization and the dynamic low-order frequency topology optimization under single operating conditions are carried out,and the topology optimization results in each case are obtained.And then use the eclectic planning method,taking into account the static multi-mode and dynamic lowfrequency multi-target multi-site topology optimization.For the determination of the weighting coefficients of the six cases,this paper uses the orthogonal experimental design method to assign the weights to the weighting coefficients through the column orthogonal table.Tests were carried out in turn according to the test plan listed in the orthogonal table.Finally,the worst case analysis method is used to analyze the test results,and the optimal weighting coefficient combination is obtained.And finally get the ideal shape of the structure.Finally,the size of the original sub-frame is optimized.First,the sensitivity of the structure can be obtained by using the sensitivity analysis.And then according to the sensitivity analysis results,select the performance indicators of the larger parts of the size of the optimization.After optimization of the front sub-frame,lightweight effect is obvious.And the strength analysis and modal analysis of the optimized model are carried out.The results show that the optimized front subframe satisfies the requirement.