User-oriented Frontal Crash Safety Analysis For Medium-sized Bus In A Small Batch

As one important problem of traffic safety problems,more and more attention has been attached to the automobile safety problem in collision. To make the drives have wider field of view, large and medium-sized bus mostly use flat structure,which will lead to cockpit spaces become into energy absorbing area during frontal impact , consequently, the passengers especially drivers will be severely damaged.The key to protect the drives from serious damage is that to limit the deformation of cockpit within a range so as to ensure the drives a certain range of safety operation area.This paper established the bus body skeleton geometric entities model and collision finite element model for one bus;then dissussed some application technique points of the collision simulation modeling ,for instance,to do data exchange at each stage of the finite element modeling by setting specific file format and comprehensively utilizing each software advantage such as CATIA,Hypermesh and FEMB;at last, Based on the explicit dynamic analysis program LS-DYNA,solved the frontal impact analysis, and evaluated the safety of the original bus during frontal impact .To a great extent,the collision endoergic design of bus structure is equivalent to the collision endoergic design of thin-walled component .After accomplished studies on collision endoergic performance of the thin-walled straight beam component at diffeent cross section ,thickness and partial weakening ,this paper designed the bus buffer endergonic structure , modified and improved the foreside structure of the bus body,and got good results.These work provide theoretical foundation for improving the frontal impact safety of the bus.