Pedestrian Protection Simulation Of A Certain Vehicle

With the increase of the proportion of the number of casualties for the number of vulnerable road users such as pedestrian and people riding two-wheel vehicle in traffic accidents,pedestrian protection is very important in reducing the casualty rate.Most of the pedestrian traffic accidents occur in the front of the vehicle.Human lower limb and head injury account for the largest proportion and they are also significant for people’s lives.So it is very important to consider the protection of pedestrians in vehicle design.According to the demand of EURO-NCAP,this paper set up a set of design and development methods including pedestrian protection feasibility analysis,conceptual design stage of pedestrian protection and engineering stage of pedestrian protection development and verification.The design method of the front end of the vehicle is summarized to meet the requirements of pedestrian protection,then a THUMS model is used to simulate the real pedestrian impact and compare the injury using the impactors in the lab test.Finally suggestions for the design of the front end of the vehicle which is useful for pesestrian protection are provided.Firstly the feasibility of pedestrian protection is studied and styling design of the vehicle front end is analysisd,including the layout of the engine room,the design of the engine hood,the design of the bumper and the design of the energy absorbing behind the bumper.Then the front end of the vehicle is evaluated to estimate the pedestrian protection effect and to guide the modeling optimization.The general layout space is also assessed.Secondly according to the method of lab test using impactors,a finite element impacting model of vehicle-pedestrian is established.The initial state of the vehicle is simulated and analyzed.Then the pedestrian protection airbag and the lifting engine hood are designed,and the protection performance is analyzed.The orthogonal experiment and energy absorbing foam are applied,and the bumper energy absorbing device is designed,which are used to reduce the injury of upper legform impactor.Finally,according to the test method of real pedestrian-vehicle impact,the vehiclepedestrian crash simulation is carried out by using THUMS.The test results using impactors and the human body model are compared.Then injury of the THUMS before and after the optimization of vehicle is analyzed.A conclusion is abtained that the protection effect of the vehicle on the real human body model is limited based on the optimization of EURO-NCAP.