Shengqin Li,∗ Qingqing Zhao,∗ and Minan Zhang∗
Front bumper, low-speed collision, pedestrian lower leg protection, orthogonal experiment, structural optimisation
Vehicle bumper design is a key design challenge to ensure pedestrian safety in vehcile accidents, and pedestrian protection is as important as bumper energy absorption in low-speed collisions. As such, the front bumper low-speed impact model and pedestrian lower leg impact model are established respectively, and the impact protection performance of the front bumper low-speed impact and pedestrian lower leg are simulated. Seven factors, such as the thickness of the outer plate, the thickness of the ribbed plate, the number of ribs, the angle of the ribbed plate, the material of the crossbeam, the density of the foam, and the thickness of the skin, that have a great impcat on the performance of the front bumperare selected. A seven-factor optimal structural scheme is proposed using orthogonal experimental method, and the structural optimisation design of the front bumper is carried out. The results show that the optimised bumper system cannot only ensure the low-speed collision performance, but also improve the protection performance of pedestrian lower leg. The study could provide a theoretical and experimental basis for the optimisation design of the front bumper system.
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