The Safety Analysis Of Automobile Body And Topology Optimization Of The Structure

Saving energy and reducing consumption has become the important problem in the current auto industry. The lightweight design is an effective ways about energy saving, on condition that the vehicle is safe.The SUV body’s safety was analyzed by using software in the finite element method. Based on corporate standards, the car’s basic performance was obtained, and was finished the frontal collision simulation analysis, then discussed the automobile collision safety requirements. The performance indicators in different working conditions and the crash simulation results of automobile provided the data support for the performance evaluation and improvements of the new automobile.The hood was discussed under the results of the finite element analysis, and became lighter, which by using multi-performance coupling theory and variable density method, at the same time meeting the requirements of the stiffness in different conditions and the modal frequencies. Based on compromise programming approach and mean frequency formulation, a new equation was defined to finish the hood’s multi-performance constraints topology optimization. The new model was built and analyzed, comparison with the basic performance of the original hood. The topology optimization satisfied the strength stiffness and modal frequency of the original hood, reached the lightweight effect. It is validated the new car was safer than the original car, through the collision analysis.Through the above analysis, it is verified that the topology optimization program used in this paper reached to meet basic performance and crash safety requirements, in the meantime got the lightweight effect and the method used in this paper is feasible in dealing with multi-performance optimization. The optimization method between crash worthiness and lightweight provided technical support for the practical application.