Study On Simulation And Improvement Design Of Coach Rollover Safety

In recent years, with the quickly development of coach industry and highway passenger transportation, the amount of coach accident increase rapidly, especially the rollover accident is most serious for loss and damage.so improve the safety of coach rollover is urgently for our country highway safety level。at the same time it give a great promoting for manufacturer in our country to develop the overseas market and enhance the competitiveness of the international market.Now, the new edition of GB/T17578will be carried out this year, at present domestic related research is still in its infancy, especially the research on the security simulation study of coaches rollover starts newly in our country. Therefore, enhance the study of coach rollover security and improve the design of structure has great significance.This paper have the study from established the simulation model, the evaluation of simulation results and the improvement design. As a tourist bus for example,mesh the body using HyperMesh based on the CAD data provided, and the coach frame finite element analysis model is established, then use OptiStruct to simulate skeleton model for four common working condition analysis and modal analysis, which checking its intensity and stiffness to verify the validity of the model. Established the finite element model with skin Consult the draft of GB17578and calculated it with LS-DYNA, analyze the simulation results using the HyperView,and LS-PREPOST. Simulation results illustrated the skin effect on the safety of bus rollover, the second root window pillar and the front waist beam intrude into the front passenger coMPartment living space.According to the structural mechanics analysis of thin-walled structure, research the measures of improving the the bar bending deformation capacity and stability to get a lot of specific improvements, and analyze the feasibility of a number of options.Last, improved the first pillars and have the simulation. this paper analysis and improved the evaluative methods on the upper structure intensity, then evaluated the simulation results, The DIα value of the coach is1.03and the star level evaluation is, after the improvement,the DIα is0.65and the star level evaluation is, which reached the demands of rollover security regulation. The results show that improvement has an evident effect,This paper towards to the study of the rollover test simulation and the improvement,which put a reference to domestic manufacturers and research institutions for the same kind of coach rollover simulation and improvements. This study result built a important foundation to further study and offers references for the release and revision of the GB17578.