Research On Structural Optimization Of A Vehicle Body.in.white Based On Finite Element Method

The lightweight design of BIW is of great significance to reduce energy consumption and exhaust emissions.It can further reduce costs on the premise of ensuring vehicle performance requirements,which has become one of the main research directions in the automotive industry.In this paper,the lightweight design of the BIW(body in white)structure of a car is carried out.The specific research contents and results are as follows.In this paper,the BIW of a car is taken as the research object,and the modal and stiffness analysis of the BIW is completed by using the finite element method.With the aid of sensitivity analysis and structural optimization method,the BIW is lightened on the premise of ensuring the performance of the BIW.Firstly,the finite element analysis theory,structure optimization theory and method,sensitivity analysis method related to the lightweight design of BIW are introduced;secondly,the finite element analysis model is built and the solution calculation and result evaluation of BIW modal,bending stiffness and torsional stiffness are completed;further,the sensitivity analysis technology is used to adjust the plate thickness of parts and optimize BIW structure.After optimization,the performance indexes of BIW are analyzed and evaluated again,and the results show that the performance indexes of BIW are greatly improved after optimization,which can meet the design objectives,the quality of BIW is reduced by 4.5%,and the lightweight effect is good.In this paper,the combination method of size optimization and structure optimization is used to carry out the lightweight design of a Car BIW.With the aid of sensitivity analysis method,the key parts that need to be optimized are accurately found,the design time is saved,the design cost is reduced,and the design efficiency is improved.It has certain guidance and reference significance for the development and lightweight design of the same type of Car BIW.