Research On Occupant Injury Based On Analysis Of A Car Rollover Crash

In recent years, with the decreasing of frontal impact, side impact accident, rollover accident ratiorises. So the study of rollover crash to reduce occupant injury in rollover accident has important socialsignificance. About vehicle crash safety study has different method, such as test, finite elementanalysis, etc. The test method is fundamental the most effective method to evaluate of vehiclesafety. With the development of finite element method in engineering field, the finite elementtechnique has much advantage, low cost, high utilization ratio, easy to modify the model,visual result, etc. Therefore, the combination of simulation of the finite element method andtest is the main development method in auto companies.This article researches on occupant injury in a car rollover crash by computer simulation.Meshes the existing mathematical model of vehicle by HyperMesh, and establishes a finiteelement model of a domestic car. At the same time, this paper also researches the method ofbuilding the crash finite element model in the process; the dummy in this article comes fromVPG(virtual practice ground), the non-commercial deformable50%, demarcates the dummymodel so as to satisfy the requirement of the regulation; establishes a finite element model ofseat belts and carries simulation to verify the validity of its constraints performance;assembling and installing all the model has established according to the requirement ofregulatory, then defines the contact, sets the boundary conditions, the output control cards, etc;LS-DYNA is explicit finite analysis software, it calculates the crash model, gets motion stateof the vehicle and occupant during rollover crash; extracts the major parts of occupant injuryvalues, analyzes the reasons for occupant injury, provides the basis for the occupantprotection.At last, this paper gets conclusions of this study content and has a prospect about thefollow-up. The result of this study can be used as a reference to improve the vehicle rollovercrash safety performance, especially in terms of occupant protection, and achieves theultimate goal of improve the car rollover collision safety.