Vehicle Restraint System Simulation Optimization Based On Surrogate Model Method

The automobile industry is an important industry in our country, it develops continuativly and fastly, and the tenure of vehicles also increases fastly. The improvement of automobile safety not only reduce the casualty and the property in the traffic accident efficiently, but also be helpful to the expedite transportation,the stability society and the harmonious lives. To enhance the vehicle passive safety, the structural design and the occupant protective system are the two aspects that we must consider. Therefore, the development of vehicle occupant restrains system will provide the experience to the automobile enterprises, and also will enhance the competition of automobile enterprises, adivese it will be advantageous to enhance automobile safety in our country just from the society.The simulation technology was used to analyze and optimize the performance of automobile safety. With the development of automobile simulation technology, to find a new method which is more suitable for the automobile crashworthiness simulation optimization design is very important. MADYMO is one of the softwares which are popular for collision simulates in the present, it is used by many vehicle company to estimate and optimize the performance of occupant restraint system oversea.This paper has done some works for digestion and absorption of MADYMO, analyzed the multi-body theory, mastered the method of setting up occupant restraint system through MADYMO, and researched the general process of passenger protection. According to a domestic car's finite element model, established the seat belts,airbags,seats,steering and interior parts of the frontal impact occupant restraint system simulation models and PSM model by the software. Through real car collision test verified the correctness of the model.Then, based on surrogate model technology and optimization techniques, at first aim at the front impact passenger protection, combining Kriging surrogate model methods, with the feasible direction COMMIN and multi-objective Genetic Algorithms NSGA-II, using MADYMO to study the multi-objective optimization of occupant restraint system, the result shows that it is is satisfactory; then, aim at side impact PSM model, adding side airbag, using the combination of response surface methods and optimization COMMIN, optimizing the parameter of airbag.The results show that the method in this paper can rapidly, economically and accurately solve the problems of occupant restraint system optimization, which are refered by the passenger restraint system optimization.