The Study Of Airbag Defect Judgment And3-year-old Child Protection In Out-of-position

In the wake of rapid growth of Chinese economy, the popularity of cars, and thegrowth of installation rate of airbags, complaints and disputes about airbags get moreand more. And due to them, airbags defect investigation has become the hot potato.However,<defective auto product recall management system> was published in2004in China, from then on, the airbags defect investigation is set out. What ever to say,the accumulation of experience and knowledge was not enough in so short period oftime to do the airbags defect investigation well. Otherwise, among the people who getgreat injury from airbags, most are children in out of position.Based on the investigation of recall system, reports of abroad mature vehiclerecall organizations, and by mature vehicle passive safety technologies and methods,analysis conclusions about many complaints and disputes about airbags were given.Given the different kinds of factors during the airbags defect investigation, suchas repeated and complicated processing, long time span, the investigators hardly dealwith them. Based on the above technologies and methods, a defect investigation flowis given in this thesis, which shows how to investigate step by step. At the same time,this flow is verified by a case.Following the regulation of FMVSS208about the out-of-position of3-year-oldchild’s head on the dashboard, an optimization analysis is done using the simulationsoftware MADYMO in purpose of decreasing the child’s injury caused by airbag, interms of two factors–the delay time between two-stage gas generation and gas ratioof those. The results show that the child’s injury is smallest, when the delay time is30ms, and gas ratio is50:50.