The Simulation And Testing Research On Airbag Protection

In recent years, as an opportunity to access to the WTO, China has rapidlydeveloped the economy and the auto industry as the leading new industrialdeveloping most rapidly. With the people’s living standard remarkablyimproving, the quantity of private cars is increasing year by year. But atthe same time, traffic collision accidents are more and more closing topeople’s normal life, the safety performance of cars is more and more focusedby the people. How to improve vehicle safety system and reduce the harm ofthe passengers in the accident, effectively insure the occupants’ safetyhas become one of the most important topics on influencing and restrictingthe development of automobile industry. Based on the large population, hugeamount of the automobile, and the characteristic of crossroads and T-junctionmore in the city, there has caused frequently traffic accidents in China. Sooptimizing and improving the effective protection of the safety airbag isbecoming a necessity. In1984the United States issued FMVSS208regulations,after several amendments to the airbag system, it has a more perfect andspecific requirements, which has defined how to handle OOP (out of position)state: the static test of the occupant out from state (occupant not fastensafety belt, prematurely or excessively moving forward, or occupant sittingin the front position of the seat), using dummy bodies of1year-old,3year-old,6year-old dummy child,5%adult female, and the dummy bodies beyond the normalsize and weight. China’s auto industry must improve the performance ofsecurity system and meet the international standards if it wants to have enoughcompetitiveness and enter the international market.The author has studied the passenger side airbag and selected a singlestage gas generator and a non-visual airbag decoration cover bag. And puttingforward three kinds of the whole structure of airbag, combining the foldingways of airbag, theoretically analyzing from the design, establishing the airbag structure of Z-axis and Y-axis unfolding slowly, X-axis unfolding fastas the base of correlating analysis. Comparing the analog tests between thehemisphere impacting test and dummy impacting test, choosing MADYMO softwarewhich is more suitable for the study, making full use of the IMM calculatingmethod based on hydrodynamic in MADYMO, calculating the stress and straininside the airbag through the mapping relationship between the two grid, weestablished a more accurate three-dimensional inflatable model. We haverounded analyzed and validated the accuracy and reliability of simulationmodel on the kinematics and dynamics through the static blasting tests anddynamic impact tests. Finally we verified that the folding type has asignificant effect on the OOP potential damage through the OOP analog of thecollision tests and whiplash tests on this design. This article combines thedesign, tests and Simulations, comprehensively and effectively researches theimportant role of the airbag structure on the OOP damage and has a certainguiding significance for the development of more advanced airbag.