| Safety, energy saving and environmental protection are the three major topics in today’s automobile development research and the main problems in the automotive industry. For the time being, automotive crashworthiness and light-weighting design combination is an effective means of energy-saving emission reduction at present.This paper takes a car as an example. Stiffness and modal analysis of car body by using finite element method, the body opening position analysis in bending and torsional deformation conditions, verify the body bending and torsion stiffness meet the design requirements, the first order modal frequency body for23.29Hz, higher than the engine excitation frequency of20Hz, verify rationality of car body design.The integrated use of HyperWorks and LS-DYNA finite element software analysis of safety of a car body, vehicle crash safety requirements. Simulation analysis of vehicle frontal crash test, get two kinds of conditions of the simulation results. Analysis of the vehicle crashworthiness problems, on the front rail and wheel housing reinforcement added inducing groove, increase the front side member and the A pillar reinforcement thickness structure improvement. Modified body collision deformation are improved obviously,40%frontal offset collision acceleration is reduced from32.6g to28.3g, parts of the intrusion is improved, validated the feasibility of the improved scheme, to provide data support for the improvement of vehicle safety evaluation and optimization of new models.According to the results of finite element analysis, the white body as the object of study, the sensitivity analysis method based on different conditions, in order to static stiffness and modal frequency requirements, optimization of body parts thickness so as to achieve lightweight goals. Through analysis of40%frontal offset collision of the improved model, collision safety new model is higher than that of original model, which verifies the feasibility of the lightweight design scheme. |
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