Research On Optimization Of Car Seat Skeleton Based On Sub-model

With the rapid development of automobile seat industry and modern science and technology,computer-aided technology is more and more widely used in the design and development of automobile seat.Manufacturers of automobile seats often use various auxiliary software to simulate the standard test conditions.At the same time,they carry out matching simulation research for related products,and use the analysis results as the initial reference basis to further reduce the overall development expenditure.In this thesis,the dimension optimization based on sub-model method is combined with the non-linear finite element technology.The optimization sub-model of seat frame is selected through the finite element simulation analysis of the conventional test of seat belt fixed point test,pillow strength test and backrest frame assembly strength test.Then,the size of the extracted sub-model is optimized,and its validity is verified,so as to improve the efficiency of seat research and development.Firstly,the emphasis of this thesis is to calculate the strength of the whole seat and its components and analyze the strength characteristics of the seat in the fixed point test of the seat belt,the strength test of the pillow and the strength test of the backrest skeleton assembly.At the same time,it can be judged by seat belt fixed point test,pillow strength test and backrest skeleton assembly strength test,so the focus of this thesis is also on the characterization of specific strength characteristics under standard test conditions.Secondly,pretreatment is carried out in Hyper Mesh software to construct finite element model of seat under various working conditions.Subsequently,based on the standards of each category,the simulation and standard are consistent or close to the loading mode,so as to achieve the effect closer to the standard operating mode,and at the same time,the key parts of the analysis are verified.After the basic modeling procedure,a complete finite element study is carried out to study the specific analysis results,and to further determine whether the relevant car seats can meet the relevant test requirements.At the same time,according to its analysis,the sub-model to be optimized is selected,and the effectiveness of the sub-model for the overall model is verified.Finally,according to the optimization sub-model selected before,the size of the sub-model is optimized by integrating LS-Dyna with Hyper Study.The optimizationresults are rounded according to the plate number and specifications provided by the market,and then applied to the sub-models of seat belt fixed point test,pillow strength test and backrest skeleton strength simulation test to verify whether the strength meets the requirements.The results are compared with the rounded results in the simulation test of the main model of seat skeleton to verify the sub-model method.The correctness and feasibility of the application in the seat skeleton model.