Study On The Injury Protection Of 6 Years Old Child Occupant In E-NCAP

Road accidents are one of the major causes of child injuries and casualties, the problem of Child safety in our country is particularly prominent. The research of Children injury are currently based on ECE R44, FMVSS 213, and the previous version of the E-NCAP regulations. The latest E-NCAP updated the child occupant protection laws, mainly used Q6 and Q10 child dummy instead of the conventional Q3 and Q1.5 year-old child dummy to evaluate the safety of the vehicle. However, there is lack of research on this aspect in our country, in order to make up the domestic shortness of this aspect of the study, According to the collision acceleration curve of cars have been developed,child occupant crash simulation model has been established and verified by sled test data. On the basis of simulation model has been established, study on damage of 6-year-old child dummy using MADYMO and use MODE FRONTIER complete restraint system parameter optimization,The main work and research in this paper is as follow:1. Complete rear child occupant sled crash test, Build the finite element simulation model of rear child occupant and verify the validity of the finite element simulation model using the sled test data.2. Take Q6 as the evaluation target, use child occupant crash simulation model and select child occupant environmental parameters which have a significant impact on child occupant’s head, neck, chest through sensitivity analysis.3. After selecting child occupant environmental parameters which have a significant impact on child occupant, for two conditions in E-NCAP, parameter optimization has been carried out using MODE FRONTIER.This paper show that reducing the belt force limiters can effectively reduce injuries of child occupant in the frontal offset collision, but not obviously in side impact. According to sensitivity analysis, belt load limit 、 friction coefficient of booster cushion and dummy have significant influence on injuries of child occupant in the frontal offset collision. when it was 2000、0.3, The value of H3ms、neck force and T3 ms decrease of 9%, 40%, 3.9%. the grading of E-NCAP increased by 9%. Moreover, stiffness of the rear seat cushion、friction coefficient of booster cushion and dummy、flank rigidity of booster cushion have significant influence on injuries of child occupant in side impact. when it was 0.8、0.7、0.3,The value of H3ms、neck force decrease of 15.7%, 13.9%. the grading of E-NCAP increased by 67.8%.