The Structure Analysis And Improvement For Light-Duty Truck Impact Safety

The structure of the light duty truck decides that the distance between the passengers and the front face is so short. So the passengers would be pressed and lead to death when accident occurred. In our country, commercial vehicle drops behind passenger car evidently in safety technology and equipment. Insufficient attention is paid to commercial vehicle passive safety and no compelling rule is carried out for the moment. It becomes a more and more serious problem that passive security of commercial vehicle because the demand of truck of high speed and burden. To protect the passengers and promote our country transportation industry and the automotive industry, the research on security of light-duty truck is needed.On the reference of the research about vehicle's security at home and abroad, it establishes a way for coupling the vehicle deceleration and the occupant restraint system, the thesis did computer simulation based on non-liner FEM for a light duty truck which is designed by a domestic corporation. At one time, particular analysis was accomplished for the variety characteristics of displacement of truck and the main parts. Aiming at the former design's crashing safety defects, the energy-absorption device with the multi-cell tube has been designed and the corresponding substructure of the truck has been improved. The truck's crashing security has been increased notably shown from the dummy crashing test result.Stable folding mode of vehicle front rails during frontal impact is the key to achieve desired deceleration pulse. At last, the difference energy absorption device has been comparative studied and optimized. Using finite element simulation and test validation, bending stiffness of thin-wall square tubes and the characteristics of the deformation initiators are studied for achieving appropriate energy absorption. A new constrained-initiated square tube is designed for front frame deformation and creates a process for designing and improving vehicle frontal crash performance.