Simulation And Experimental Research Of An Impact Between Engine Hood And Pedestrian Head

The pedestrian protection is one of the important problems in passive vehicle safety area.Statistically, almost30%of pedestrians get head injury in car-pedestrian crash accidents.Furthermore, most pedestrian deaths occur due to the hard impact of head against stiff hood orwindshield. If we dividing the car-pedestrian interaction area, we can see that1/3of themoccur between head and engine hood. So it’s necessary to improve the pedestrian protectionof engine hood.This study aims at identification of domestic road environment,traffic injuries and trafficmode by using the integrated method of accident analysis and computer simulation.Based onthe results of accident analysis,a real car-pedestrian accident is reconstructed by means ofcomputer simulation．The main injury related parameters are calculated to predict andevaluate the risk of pedestrian injuries in the collisions．The parameters influencing thepedestrian dynamic response during the crash are studied．First of all, a real car-pedestrian accident was reconstructed by using Madymomulti-body software．The main dynamic parameters related to pedestrian injury are calculated,including the acceleration,impact force,HIC value and so on.The inherent relation betweenthe pedestrian injury and dynamic parameters is analyzed and discussed.The risk of pedestrianinjuries Can be predicted and evaluated with results from the reconstruction.Secondly, a parametric study on dynamic responses of pedestrian head in differentimpact condition is carried out by using simulation model．The car variables and levels usedin the parametric study are selected．The dynamic parameters related to head injuries arecalculated.The effects of various car variables on the injuries of pedestrian head are analyzedand discussed．Thirdly, A drop test platform is built to test the pedestrian protection performance of theengine hood. The confirmatory research of pedestrian protection performance of the pop-uphood is carried out. The experiment results showed that this pop-up hood can effectively improve the pedestrian head protection performance. Through the comparative analysis of theexperimental and simulation result, the validity of the finite element model is verified.