Design And Research Of Energy-absorbing Rear Underrun Protection Based On Compatibility Of Dangerous Goods Transport Vehicles

Dangerous goods transport vehicles and cars are incompatible with each other in terms of external dimensions,relative quality and relative stiffness.The energy-absorbing rear protection device can both block function and enhance the buffer energy absorption function.The installation of the energy-absorbing rear underrun protection device at the rear of the dangerous goods transport vehicle is an important means to improve the compatibility with the car.Through theoretical analysis of the compatibility of dangerous goods transport vehicles,the energy absorption target and acceleration target of the rear underrun protection device are proposed,and two different types of energy-absorbing rear underrun protection device are designed.The main contents of the paper are as follows:(1)Through theoretical analysis of the collision compatibility of the car rear-end commercial vehicle,the energy absorption of the energy-absorbing rear protection device in the process of car rear-end commercial vehicle is determined;and according to the test standard of the rear protection device,the energy absorption is set.The acceleration target of the trolley during the dynamic test of the protection is set.(2)The thin-walled tube energy-absorbing rear protection device is designed,and the design process of the rear protection device is described in detail.Then,six different energy absorbing units in the energy-absorbing rear protection device are simulated and analyzed one by one,and three optimal energy absorbing units are determined;and three energy absorbing units are assembled according to the energy absorption target of the rear protection device.After the protection device is built,the trolley impact simulation analysis is carried out for each of the three rear protection devices.(3)The principle and evolution process of the energy absorption structure of the multi-cell energy absorbing structure are elaborated.Different types of cells are combined into a multi-cell energy-absorbing rear protection device.The dynamic impact test and finite element dynamic impact simulation analysis of the rear protection devices are carried out.The effectiveness of the finite element analysis model of the multi-stage energy-absorbing rear protection device is verified by simulation and experimental comparison.(4)Through the simulation analysis of the two energy-absorbing rear protection devices and the simulation analysis of the actual vehicle collision,the optimal coincidence degree between the two rear protection devices and the car is obtained.The best coincidence is verified by an SUV,and the protection devices can also prevent the SUV from drilling under the optimal coincidence.