The Study On The Integrated Model Of Minibus Body Structure And Occupant Restraint System

1. Preface Due to the increase of the automobile possession quantity, far more traffic accidents arising, a growing number of people in both the automotive manufacturers and consumers have come to the realization that automobile safety is a serious problem. Safety,side by side with energy-saving and environment-protection, has become three great concerns in the field of automobile development. And the design of automobile passive safety is an engineering of the huge investment. Test is the only evaluating measure in the traditional method. It not only depends on the expensive test, but has a long period. Many vehicle manufacturers all use computer simulation for the design of vehicle passive safety. It has been the centre of independent developing ability of vehicle passive safety on the high-technology. The independent ability is always weak, the study on the design of vehicle passive safety is very little in our country, and the experience of the modern design of passive safety centered on computer simulation is lack, which has hampered the development of the transportation and the automobile industry severely. 2. Main Content of This Paper This paper supported by National Natural Science Fund GM China Science Research Fund "the study of crash dynamics simulation and passive safety measures of minibus", analyzed the passive safety of a certain minibus, and introduced the significance of the automobile passive safety, especially the content of the study on the automobile passive safety and the domestic situation. Based on a lot of the associated papers, the paper makes a brief introduction to the evaluation methods and criteria of the occupant restrain system in frontal crash, foreign protection standards and the frontal crash test. In this thesis, the theory of elastic-plastic mechanics, non-linear FE theory and the algorithm of the airbag simulation are analyzed. The flow of modeling the occupant restraint system and integrated system has been already mastered. On the basis of the study on the crashworthiness of minibus body and occupant restrains system, this thesis builds four models through FEM, as following: 1) Dummy-Minibus-Belt model: The safe belt system was built by applying to the Standard Belt system of Safe Editor of PAM-SAFE in the validated body structure model. Finally the dummy-minibus-belt system model was built. 2) Airbag FE model: According to the data provided by an enterprise, the airbag was folded. And its physic attribute and the attribute of the inflator have been defined. Then the airbag FE model was built. 3) Dummy Head-Steering Wheel-Airbag simplified model: It will cost much time to simulate the integrated model. So the Dummy head-Steering wheel-Airbag simplified model was built by extracting the dummy head, steering wheel and matching the airbag model. 4)Dummy-Minibus-Belt-Airbag model: Having matched the airbag model with the Dummy-Minibus-Belt system model, the integrated model that can weigh the whole performance of body structure and occupant restrain system was built.