Biofidelity Study Of Pedestrian Protection Test

With the increase of the number of casualties in pedestrian traffic accidents,pedestrian protection has become one of the main ways to reduce pedestrian casualty rate worldwide.In pedestrian traffic accidents,the proportion of leg and head injuries is the largest.Pedestrian protection test mainly simulate the collision processes of leg and head by using impactors to assess the vehicle pedestrian protection performance.Therefore,biofidelity of pedestrian protection test is the basis of the study of pedestrian protection,which directly determines the reliability of the test results of pedestrian protection test,and plays a vital role in protecting the life and property of pedestrians.Based on four vehicle finite element models,this paper put forward biofidelity of pedestrian protection test by comparing the injuries of THUMS model and impactors.Firstly,four vehicle finite element models validated by NCAC(American National Collision Analysis Center)were selected according to the sales of auto market and the vehicle frontend design,and the THUMS(Total Human Model for Safety)model was used to simulate the pedestrian traffic accident of these vehicles,the dynamic and injuries of pedestrians were also analyzed.Then,according to the collision conditions of pedestrian leg and head(such as energy,collision angle and collision point)and the method of pedestrian protection test,numbers of impactor simulation models were established for four vehicles according to the lab test method.Finally,the dynamics and injuries of THUMS models and impactors were compared and analyzed.This paper indicated that due to pedestrian movement and contact with vehicles in the process of collisons,it affects the dynamics and injuries of leg and head,and the difference of vehicle front-end design has a great influence on the transient of pedestrians,it leads to varying degree of pedestrian movement and contact,which means that impactors as independent component for the assessment of leg and head injuries remains to be further studied,and biofidelity improvement is needed for pedestrian protection test.