Study On Rear Underrun Protection Requirement's Performance Of Truck Based On Finite Element Method

With the growth in car ownership and continual improvement on highway classification, the number of collision accidents increased, which include a high frequency of rear-end collision. And collision accidents that a car crash the truck's rear occur frequently. Rear underrun protection requirement of truck with good blocking effect and sufficient energy absorption can availably protect rear-end vehicles, prevent cars from knocking into vans, improve the crash compatibility between vehicles. It can promote maintaining smooth traffic and reducing vicious collision accidents. Therefore, revised design and study on rear underrun protection requirement of truck for improving the passive safety of vans and road traffic safety is of great significance.Based on size parameters of Foton's model, the paper ascertained the rear underrun protection's dimension according to technical requirements of GB11567.2-2001, and then established the finite element model of protection and mobile barrier. It opted rectangle steel protective device as the research object, and selected pipe thickness, length-width ratio and bracing angle as test factors. The ordering of impact that factors act on evaluating indicators had been found after three factors and three level orthogonal test. It established and optimized regression models for every evaluating indicators after regression analysis by data processing system.For increasing the energy absorption, the paper improved the typical device in many fields, such as Induced bending, gradual absorption, maximum displacement limit, materials and structural analysis, after considering problems during the process of deformation. It selected beam's section shape, pipe thickness, length-width ratio, angle and others as test factors. The ordering of impact that factors act on evaluating indicators had been found after three factors and three level orthogonal test. It established and optimized regression models for every evaluating indicators after regression analysis by data processing system. The feasibility of improved structure had been verified by comparing the effect of energy absorption between the typical and improved guard.