| In recent years, coach rollover accidents occur frequently, people pay more and moreattention to coach rollover crash safety. Various safety regulations about the coachstructure and test were issued home and aboard, represented by ECE R66regulation andFMVSS regulation. Based on ECE R66regulation, china introduced GB/T17578-1998,and confirmed the structure of coach strictly according to the GB/17578-1998regulation.The paper takes a certain type of coach as research object, set up full frontal crashmodel according to GB11551-2003regulation, and rollover model according to FMVSS208regulation. Set up corkscrew rollover model based on ADAC Corkscrew test.Simulate and calculate the process of those kind of crash by explicit dynamic analysissoftware LS-DYNA, analysis the parameters such as invasion of passenger living spacein the process of crash. This paper mainly including such work as follows:(1) Refer to materials of coach dynamic rollover here and aboard, analysis andsummary the background、present situation and importance of this subject. Introduce thefinite element software and basic theory of coach crash simulation briefly.(2) Take the coach of Ankai Bus as research object, accept and delete the component、simplify the model according it’s structure characteristic. Set up finite element model ofthe coach in consideration of the scale and accuracy of this subject.(3) Set parameters of full front crash Simulation according GB11551-2003regulation,carry out the full frontal crash simulation and test. Confirm the finite element model bycontrasting the result of simulation and test.(4) Introduce the related regulation FMVSS208. Set parameters of rollover crashaccording FMVSS208regulation and finish the simulation. The result of simulationindicates that the frame deforms seriously and intrudes into passenger living space,doesn’t satisfy the requirement of regulation.(5) Introduce the corkscrew rollover test and parameter in the test. Set up model ofcorkscrew rollover based on this test, and calculated it. Analysis the results such asinvasion of passenger living space. The result indicates the coach satisfies therequirement of regulation.(6) Analysis the position and reason of invasion in rollover simulation. put forwardsome suggestion to improve the frame. And those suggestions make big difference. Thepassenger living space isn’t invaded by frame and the safety of passenger is improved. |
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