Simulation And Study Of Control Buffer Device Based On Pedestrian Protection

When modem automobile widely used in life bring more convenient, it also bringdisaster. According to statistics, the word each year about50million people died dailytraffic accidents each year in the United States,not less than30,000people died in trafficaccidents, of which about4,000pedestrians, accounting for about11%of the total numberof deaths. In order to reduce pedestrian injuries in the collision process effectively, the carstructural design of pedestrian protection becoming an important issue.Firstly, this article introduced the development of finite element analysis, features andbenefits, in accordance with the provisions of the EEVC (European Automobile TestCommittee), and according to the lower leg physical model of TRL pedestrians, the authorbuilt the finite element model and took the static and dynamic experiments; built vehiclefinite element model and evaluated this automobile performance with test result for lowerleg crash. After got the correct finite element model, the author self-designed the set ofmechanical, electronic, hydraulic in one integrated bumper---Electronically controlledhydraulic buffer bumper; analyzed of the basic design principles, hardware assembly,matching principle and performance conclusion; designed pre-touch warning device,setting warning range based on the real-time speed, with pedestrian recognition device,ensure the hydraulic servo system start correctly; developed microcontroller control systemfor signal input and output. Finally, on the basis of the conclusions of hydraulic servosystem performance, the author simulated this vehicle again, analysis of the leg before andafter improvement programThe analysis and studies proved electronically controlled hydraulic buffer bumper caneffectively reduce the damage of the low leg, increase the contact area, lower low leg peakacceleration, reduce the bending angle and shear displacement. This research can provide a reference for the bumper system design.