Optimization Of Structural Parameters Of Vehicle Hood Based On Child Head Protection

With the rapid economic development and the improvement of people's living standards,Chinese vehicle ownership has increased year by year.Vehicles not only bring positive effects on comfort and convenience to humans,but also bring negative effects such as road traffic accidents.According to the NAIS database,vehicles accounted for 72% of the vehicles that caused pedestrian-vehicle traffic accidents,and the front-end structure of vehicles was the most direct cause of child injury in the accident.Children's head and legs are most vulnerable to injuries in accidents,but head injuries can often lead to more serious injuries and even death.Therefore,the research on children's head protection performance of automobiles has become an important part of the research on automotive passive safety.This article first analyzes the research history of domestic and foreign pedestrian protection regulations and the current status of domestic and foreign pedestrian protection research.Through statistics on traffic accidents in Harbin from December 2017 to December 2018,the characteristics of child-vehicle collision accidents are introduced.Classification and evaluation of pedestrian head injuries.Based on Hertz theory,a mathematical model of impact force and a simplified mathematical model of children's head impact force were established.Then use ANSA software to establish a finite element model of the child's head impactor and vehicle front-end structure.According to the requirements of Chinese C-NCAP regulations,the pedestrian head protection test area was divided,and 7 test points were selected.The effectiveness of the finite element model of the children's head impactor was verified by a drop-mark test.The validity of the established finite element model of head collision is verified through real traffic accident cases.Based on the selected 7 test points,the simulation was vehicleried out.By analyzing and selecting the structural parameters that have a greater impact on children's head injuries during human-vehicle collisions,the influence of changes in various structural parameters on children's head injuries was obtained.Finally,this paper uses orthogonal experiments to design the experimental scheme,and uses intuitive analysis to obtain the significance of each structural parameter affecting the head injury of children,selects the optimal combination,and verifies the effectiveness of the optimal combination.The results prove that the optimized front-end structure of the vehicle can reduce children's head injuries,indicating that the best optimization scheme selected in this paper can improve the child's head protection performance.