Simulation Analysis And 0ptimization On Safety Performance Of Frontal Impact In A Light Truck

As the laws and regulations of vehicle passive safety experiment continuously get improved, nowadays the application extent of 2014 revised edition of The protection of the occupants in the event of a frontal collision for motor vehicle has already covered the light truck, before which, no uniform experiment validation methods of light truck were proposed, so there were no relative designs and simulation experience. Taken light truck as object of research, this paper investigated the influence of vehicle body constructure on impact safety and optimized the local constructure.Firstly in this paper a whole light truck impact model was built by Hypermesh, which was calculated by Ls-Dyna under the condition of 50km/h frontal impact of rigid wall, to assess the calculation results from the perspective of force transfer path, energy management, cab invasion and vehicle body deformation and analyze the influence factors of impact safety. Then local constructure dissatisfying the design requirements was optimized. For example, in order to increase energy absorbed and decrease bend deformation of beam, beam constructure and size of energy absorbing box were emphatically optimized, and the effectiveness of optimized constructure was validated by beam sub-system model. And in order to decrease the cab invasion deformation, front panel, side panel of cab and constructure of A pillar were improved. Besides, optimized whole vehicle impact model was calculated, to compare calculation results with results of original model and target value. Finally occupant restraint system analysis model was built by Pre-Post of Ls-DYNA and calculated. According to relative laws and regulations, calculation results were assessed and analyzed.Research results indicate that as to light truck, insufficient lateral stiffness of middle beam constructure is the main influence factor of impact safety, which leads to bend deformation resulting in oversize cab invasion. With optimized design, beam bend deformation disappears, and the energy absorbed is evidently increased, and the cab invasion is effectively controlled, and 3ms mean acceleration of human head, compressure amount of breast and compressure force of thigh satisfies the laws and regulations. In a word, optimized whole vehicle constructure effectively contributes to improve safety performance. This paper offers theoretical direction and numerical simulation method to later design of light truck.