Research On Vehicle Frontal Impact And Optimization Of Passive Safety

At present, car ownership has a sharp increase, that brings great convenience for people’s lives, improves the quality of lives, but also traffic accidents have a serious threat to people’s lives and safety, have brought the huge property losses for the society. In order to better protect people’s lives and property safety, the study of vehicle collision safety and the improvement of crashworthiness have become the important study content for the car manufacturers. On the basis of Europe and other countries’ automotive passive safety related regulations, our country enacted Vehicle Safety Evaluation System C-NCAP in July 2006, it has greatly improved the performance for domestic vehicle after several amendments.In this paper, study of existing research results, the basic theory of car crash simulation of finite element is introduced, and it provides theory support for the vehicle frontal crash simulation. The work of grid division, material properties, model assembly and rigid wall, exposure Settings, parameter calculation, K file output, etc is completed by Hyper Mesh software, after the vehicle frontal crash finite element model is established. In determining the calculation result with high confidence, the gradual change in the energy of the car, the distribution of energy absorption member, analyzed body speed, acceleration, engine compartment deformation and the key parts deformation are analyzed. It shows the presence of the acceleration is too large, the front door frame and the front hoardings have excessive deformation and other defects. It needs further optimization.The paper in order to improve the performance of the vehicle collision, the influence on the result of the collision of eight parts are selected, with its thickness as the design variables, the right side of the B pillar peak acceleration as the optimization goal. The samples of 17 points are selected by Latin hypercube experimental method, improved response surface method is applied to precision better secondary agent model, so as to find out the best components thickness values.Optimization results before and after comparison shows that the right side of the B pillar acceleration decreased about 22.8%, the door frame deformation reduced about 33.7%, dash panel invaded volume reduced about 28.2%. That shows the intended purpose have reached and the car is more safety for passengers.In this paper, the front of the car crash simulation analysis and optimization solutions for improving vehicle passive safety research has important guiding significance and engineering value.