Parameter Design And Modeling Of The Frontal Passenger Restraint System

According to statistics, National Public Administration registered 6.71 million traffic accidents in 2000. 0.94 million people were died and 4.19 million people were injured during traffic accidents. That caused 2.67 billion RMB economic losses directly. Safety trouble is getting more and more critic with automobile possession quantity rising. Auto safety became an important reason restricting development of transportation and auto industry in our country. It is very urgent and necessary to study automotive safety.Occupant restraint system is one of main research direction in auto passive safety fields. It comprises safety belts, air bag, instrument panel, seat, steering system, etc. The research is focused in mechanical characteristics of belts and airbag that could achieve optimal restraining performance, avoiding second crash between body and interior. Researching and developing safe seat, energy-absorbing steering system, safe panel and energy absorbing material of trim in order to mitigate the injury when second crash happened. Because the performance of occupant restraint system is related to the occupant's life, what is concerned is how to evaluate it and many criteria were developed. Some countries issue automotive crash safety standards to unify these criteria. The protection indices are main content in these rules.1 In this thesis, the internal and external status of passive safety had been investigated. Airbag-the important part of the restraint system has been introduced by its catalog, working principle and its drawbacks.2 The injuries of head, chest and abdomen are the most common injuries sustained by the occupants in frontal impact. Based on the Abbreviated Injury Scale, the Head Injury Criterion, 3ms Criterion, Chest Compression, Viscous Injury Response and Tibia Index are elaborated. The government legislation is design guidance and reference of occupant restraint system in frontal impact. The regulation of each country demands the performance of occupant restraint system by limiting the measured injury index of dummy. The US and European regulations are two important safety regulations around world, which are referenced by other countries when they establish their own. The New Car Assessment Program is also elaborated.3 Madymo solver is digested based on multi body theory. Some of the other software associated with Madymo and preparation of the experiment is introduced. According to the data of a homemade Passenger car frontal impact experiment, a Passenger side Passenger restraint system simulation model is established, which involve FEM seatbelt, airbag, Multi-body floor, knee bolster, instrument panel, seat etc. These bodies are connected by kinetic or dynamical joints and the relative motions of each body can be simulated. The interactions of each body are defined by"contact". The interaction forces are calculated based on penetration values via defined contact characteristics. After long time strict correlations, a parameterized model is established.4Described the process of modeling, experiment data collection and management by using madymo software. Through a lot of work, we finally got a validated, stable simulation model, which was the base of future simulation work.Explored and mastered modeling method of Passenger side restraint system, and accumulate some valuable modeling method and experience. Described the process of modeling, experiment data collection and management by using madymo software. Through a lot of work, we finally got a validated, stable simulation model, which was the base of future simulation work. Along with the area of airbag arrangements in Jin Heng Company have been expanding market share, and to requirements of airbag system. In 2003, we introduced MADYMO software to analyze CAE. In our work. We urgently need the procedure of simulation analysis and input design, put forward and determine the basic ideas of the thesis. MADYMO simulation can reduce the costs of development, improve system-performance and shorten the cycles of development in the process of airbag system. We put forward the feasibility program for the supplement restraint of domestic automobile safety and competition in international product.