Application Study On Robustness Optimization Design In Occupant Restraint System Development

With the rapid development of society and economy, the amount of automobile increases, the automobile has improved people’s quality of life, meanwhile traffic accidents have become a hazard to human life and property as a major social problem. Vehicle safety has become a hotspot in vehicle engineering fields; academia and the government also pay much attention to it. How to ensure the safety of occupants during collisions and improve passive safety performance of vehicles has become an important topic among the automobile manufacturers who developed the new models.Because of the huge costs of real vehicle collision, the experimental data difficult to collect and the development cycle of products are too long; the computer simulation technology is increasingly recognized as an effective safety research method of vehicle. At present, we often neglect the influence of the uncertainty during performance improvement of occupant restraint system, mostly fixed on the characteristic of safety belt, air bag, steering wheel and seat. When the design variable fluctuations or changes in collision, it always lead to the optimization object beyond constraints, the design failure, lengthening products development period and increasing costs. Conventional design can’t guarantee the reliability of the design parameters and the robustness of objective function.In order to lower costs, the minibus with standard configuration does not often bring the air bag, the passenger vulnerable to be injured seriously while frontal impact. At the foundation of establishing and verifying an occupant restraint system of a minibus, the paper established a robust based optimization method of occupant restraint system, combining the applications of experimental design, robust theory and Taguchi robust design. Carry on the optimization grouping of the parameter at the point of the best comprehensive performance. Max the restraint efficiency of upper slipping position of the seat belt, seat stiffness, bottom rim stiffness and webbing stiffness. It achieves the optimization of design object and enhances the robustness and reliability of the objective function in the case of the airbag is not configured.The results show that the method and procedure based on Taguchi robust design are effective in this paper. Comparing with the deterministic optimization results by using design of experiments, the method not only to achieve the optimization of design object, but also greatly enhances the reliability of the design parameters and the robustness of objective function. This method is proved to have stronger project practicability.