| With the enhancement of people’s attention about vehicle passive safety, and the Chinese Passenger Car Side Impact Regulation and Chinese New Car Assessment Program (C-NCAP) are promulgated and implemented, side impact has become a focus in the study of passive safety car. The side of car is the weakest part, it is particularly important to the enhancement of car crashworthiness that improving the stiffness of side structure. The reasonably match of side structure in the car can greatly improve the crashworthiness of car and reduce passenger injury degree in side impact.The object of study is a SUV model, using HYPERMESH for pre-processing, HYPER VIEW for post-processing, LS-DYNA as the solver, simulation and analysis of side impact was applied. The model that verified by analysis of energy is validity.Problems were identified by analyze the deformation of body and the transfer path of side impact force, then put forward the improvement plan combined with the design requirements of side impact. In order to improve the energy absorption of parts and reduce the deformation of side by improving the joint area of B pillar and the cross section shape of floor beam and roof beam.The optimization objective was material of side components. Based on the improved model, finding the optimal scheme was assessed with the help of orthogonal experimental design and comprehensive equilibrium methods.Utilizing uniform design method and the response surface method, the thickness of the side wall parts was optimized. Firstly, design experiment and calculated. Secondly establish the response surface about the largest intrusion and speed of B pillar’s middle body, and total mass of the components. Then, the minimum total mass is optimization objective, the amount of intrusion and intrusion speed is constraint to build up multi-objective optimization. The effectiveness of proposed scheme was found by MATLAB and the result was validity by contrast the value of simulation with calculation. |
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