| 1. Preface Today the automobile industry has been developed more and more, especially with the development of the highway, people has realized that it is impossible to avoid traffic accident entirely, because of the driver himself, the road conditions, the weather, the vehicle technique condition and so on. It is meaningful how to keep occupant form injury when impact happened, and to reduce the damage which arose by the accident, and also to improve the safety of vehicle. Nowadays safety has been become one of the three develop aspect of the modern vehicle technique. It has been replaced of quality and price gradually, and becoming the first factor in the vehicle market competition The main road in our country is grade crossing road, so it is more possible to happen side impact. According to the data, front impact happened 128.52 thousand times in 2002, accounted for 20.83 percent. Side impact happened 212.292 thousand times, accounted for 34.4 percent. So it is meaningful to develop the research work of side impact in our country. The study of occupant restraint system is one of the main contents in the research field of vehicle passive safety. The study content of occupant restraint system contains the development of side airbag, safety seat and optimization of door trim and pillar. Now the computer simulation is the most universal study method, this method can not only reduce the number of full test, save cost, but also used in concept design phase and shorten the development cycle. This paper is based on the project of "the parameter optimization of occupant restraint system in side impact"According to the analysis of the original occupant restraint system, the optimization idea has been put forward. 2. Main content of this paper 2.1The Creation and Validation of Occupant Restraint System Model in Side Impact This paper creates a vehicle side impact occupant restraint system model using MADYMO3D, The software which is based on Multi-body theory can effectively simulate the impact process and the injury of occupant. The model consists of four parts, the car module, the MDB module, the seat module and dummy module. Car and MDB module base on the real structures. Euro-SIDE-1 dummy come from the dummy family of Madymo's .Before crash simulation, dummy adjusted pose in the field of gravity. The simulation carried out accord with the ECER95. The correlation between simulation and full test is regarded as efficient if the error is about 15 percent. Based on the results of full test, the validation of the deformation, the deceleration and the biomechanical response of dummy is done. The correlation shows that the model created is effective, and the modification can be processed on the basis of this model. 2.2Parameter Analysis and Optimization of Occupant Restraint System According to the great deformation of the seat in the full test, we studied the function of the seat in side impact, and draw a conclusion that the seat system was not the sensitive system in side impact. So it didn't need to improve the design of the seat, and just keeping its own design parameters is ok. The paper applied the stochastic design space method, and introduced the correlation coefficient in statistics to study the relationship between restraint system parameter and occupant injury value. We knew that the relationship between system parameter and occupant injury value was not simply linear. If we want to improve the performance of restraint system, we must take account of the whole system. Based on this result, we analyzed the relationship between the whole system performance and parameter, and put forward the best value of every parameter. 2.3 Matching Side Airbag in Thorax and Abdomen Area The paper introduced the type and the development status of side airbag. Based on computer simulation design, the paper designed the side airbag model mainly protecting thorax and abdomen, and matched the airbag to the original restraint system, then made the airbag tally with the performance of restraint...
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