Study Of Submarning Based On Human Model For Rear Seat Occupant

During the frontal collision,the occupant's living space increases due to the reduction of compartment intrusion.Such a large living space greatly increases risk of submarining,as well as rear occupant.When submarining,the lap belt may penetrate the abdomen of the occupant,which would increase injury risk.Different technology advancements have been made in resolving this problem by a large number of collision tests since the advent of motor vehicles.Considering the ethical issues,collision tests are to replace real people or cadaver with H? dummy.Through literature research and various simulation analysis,it is found that the H? dummy,widely used for safety assessment,integrates a very stiff lumbar spine.This feature prevents the pelvis rotation and consequently submarining.Therefore,it is necessary to study the phenomenon of passenger submarining more deeply by using high biofidelity,which can effectively predict the human model of passenger submarining in collision accidents to the occupant restraint system.Co-simulation with Hypermesh and Ls_Dyna finite element software,this study compared the differences between the hybrid ? dummy and the human body model according to the finite element modeling method of the occupant restraint system,and studied the underlying causes of the different submarining trends from the perspective of the model structure.Finally,the rear occupant submarining phenomenon was reproduced,and the Thums human model with high biofidelity was applied to the rear occupant restraint system.On the basis of in-depth analysis of the mechanism of submarining,the influence of different parameters of the rear occupant system on the submarining was studied.By changing the parameters of different occupant restraint system,several concepts of anti-submarining countermeasures for reclining posture have been developed in the CAE environment.The effectiveness of the anti-submarining programs were verified by the sled simulation tests of the frontal impact loading of 56km/h with the validated finite element model,and the effects of different parameters on other parts of the human body were compared.In order to provide reference and guidance for the design of occupant restraint system and improve the reliability of passive safety,the most effective anti-submarining measures were found with which all the other injury parameters met the requirements of relevant laws and regulations.