Research On Design And Performance Optimization Of Adaptive Airbag In Automobile Side Impact

With the continuous development and progress of society and the improvement of people’s living standards,the traffic pressure brought by the rapid growth of car ownership is increasing day by day,and the incidence of traffic accidents and casualties are rising sharply.Therefore,active and passive safety research has become one of the hot spots in the automotive field.Scholars have always focused on frontal collision safety research,and side collision,as one of the main automobile collision accidents,has a great threat to people’s life and property safety because it does not have enough energy absorption area and collapse space when the collision occurs,and it is close to the occupants laterally.Strengthening the research on vehicle side collision safety reflects the people-oriented development concept.Improving the safety performance of side impact is mainly through optimizing the design of the side structure and restraint system.As the core component of the vehicle restraint system,the side airbag is the earliest and most direct contact with the occupants when an accident occurs,which plays a vital role in protecting the occupants.Therefore,this paper focuses on the research on the design and performance optimization of the airbag during the side impact.The specific research contents are as follows:(1)Firstly,the simulation model of frontal collision of a certain vehicle is established and compared with the frontal collision test of the real vehicle to verify the effectiveness of the whole vehicle model.Then,the simulation model of the collision of the movable deformable barrier and the side column of this vehicle under the requirements of C-NCAP regulations is established,and the difference of vehicle side wall response under the two collision conditions is analyzed from the aspects of energy absorption,intrusion volume and intrusion speed.(2)Based on the difference of vehicle side-wall response under two side-impact conditions,a side chest and hip airbag is designed to protect the chest,abdomen and pelvis of typical male and female drivers,and it has adaptive function under two different side-impact conditions.According to the simulation results,the injury values of each part of the occupant are obtained,and the protective performance of the side airbag is evaluated by comparing the requirements of laws and regulations.(3)The airbag optimization parameters were selected by single factor test,and the mixed horizontal orthogonal test was designed to determine the number of simulation experiments.According to the orthogonal test results,the second-order response surface proxy model between the comprehensive injury evaluation index WIC of the dummy and the optimization parameters was established.The improved whale algorithm was used to optimize the function model,and the optimal optimization parameter values were determined and brought into the simulation model for calculation.The differences of the injury values of different parts of the dummy before and after optimization were compared.(4)According to the optimized parameters,the airbag sample was designed and manufactured,and the seat burst test of the side airbag was carried out on the Banpo experimental platform,and the volume and pressure change data of the airbag were counted,which was compared with the static deployment simulation results of the airbag seat to verify the effectiveness of the designed side airbag.