| The car body is an important component of automobile structure. Its stiffness, torsion and other factors affect the deformation of the body. Lack of rigidity or torsion may cause leaks of the door and other problems; its fatigue affects the automobile safety performance. As the pursuit of higher quality, the domestic and foreign research institutions strength the researches on vehicle static and dynamic performance and fatigue life.In this thesis, the research on the static and dynamic characteristics and fatigue life analysis of a certain type of car body is carried out. First, the finite element model of the BIW is established, and the finite element model is used to analyze the torsional stiffness, bending stiffness and modal. And based on this, the sensitivity analysis is carried out.Then, establish the multi-body dynamics model of automobile chassis in Adams, combined with the road excitation, get load-time information of the suspending points; this information is used as input signal to the BIW, analyzed the fatigue life of the body. The fatigue strength of the bottom plate of the vehicle body is not enough, so the improvement is needed.Finally, through the optimization and adding a new plate in low fatigue area, improve the fatigue strength of the body in low life zone. |
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