Research On Optimization Method Of Torsion Beam Structure Based On Kriging Approximation Model

With the development of automobile industry,cars become more and more popular in people’s daily lives,and cars has become one of the most important means of transportation.And with the improvement of people’s economic life,more and more people have a private car,most of the cars are low-end models with twist beam rear suspension.In this paper,a torsion beam rear suspension is taken as the research object.(1)Firstly,this paper expounds the present situation of the domestic and foreign research of torsion beam and the application of CAE technology,then use the Hypermesh to established finite element model based on the CATIA 3D model which laid a foundation for the structural analysis and optimization of torsion beam.(2)The modal analysis of the torsion beam is carried out by using Hyperview software.The first 6 order modes of the torsion beam are mainly rigid body modes of the torsion beam,the modal analysis results show that the seventh order frequency is low,and there is an optimized space.Based on the results of modal analysis,the torsion beam flexible body is built by using the Motionview module in Hyperview and the flexible body is used to establish rigid flexible coupling vehicle model.(3)Based on modal stress recovery theory,the modal displacement history file as a load is derived from the model simulation,and it is used to analyze fatigue life of torque beam in MSC.fatigue.From the fatigue life analysis results can be seen,the fatigue life can be further optimized.(4)Parametric modeling of torsion beam is establish by grid deformation technique and morphing tool Hypermorph.Finite element model of torsion beam can be changed by changing the parameters,which can avoid modifying the 3D model and save a lot of time.(5)The Latin hypercube sampling is used to design the experiment,and the sample points are selected to establish the Kriging approximate model of the parameters of the torsion beam.Then multi objective optimization of torsion beam structure is carried out by NSGA-II.Compared with the original model,the optimized torsion beam has better performance.In this paper,the structural optimization method of torsion beam is studied,and a technical route for the optimization and design of torsion beam structure is explored.The utility model can greatly reduce the time and energy in the process of the optimal design of the torsion beam,and can obtain the torsion beam with better performance.It is very important to design the torsion beam.