Optimization Of Adaptive Restraint System Considering The Difference Of Occupant And Impact Conditions

The occupant restraint system can effectively improve the safety of passengers.However,the traditional occupant restraint system is developed and designed based on specific crash conditions,occupant shape and riding posture,which can not effectively deal with the complex and changeable actual road crash conditions and occupant state characteristics.With the development of vehicle active safety technology,vehicle collision parameters and occupant status parameters can be extracted before the accident by using perception technology,and the configuration parameters of adaptive occupant restraint system(ARS)can be adjusted accordingly to implement targeted safety protection for the occupants in the vehicle.However,there are still some limitations in the current ARS,such as few collision conditions.How to cover the actual road collision conditions and occupant status characteristics is an urgent problem to be solved in the development of ARS system.Aiming at the real road collision conditions,the optimal parameters of the restraint system under different collision conditions(relative collision speed and dangerous target vehicle mass)and different occupant states(occupant shape and sitting posture)are obtained.The main contents,methods and conclusions are as follows:(1)the key factors affecting occupant injury in vehicle collision are analyzed,including occupant state parameters(body shape,sitting posture)and vehicle collision parameters(relative collision speed,mass and stiffness of dangerous target vehicle).The expression method of numerical variables of the above parameters is studied,and the extraction method based on perception system is studied by using statistical method This paper presents a new method to predict the whole vehicle mass based on the dimension of dangerous target vehicle.(2)The simplified finite element models of the two types of vehicles are established and verified,and the models meet the requirements of the mass and stiffness of the corresponding vehicles.According to the simulation results of the two kinds of vehicle impact test,the relationship between the target speed and the vehicle acceleration is established.(3)The simulation models of occupant restraint system under various crash conditions are established and verified.Four ARS parameters are defined as optimization design variables,WIC as optimization criterion,Latin hyper-cube test design,second-order polynomial response surface surrogate model and non dominated genetic algorithm are used to optimize the parameters of ARS system,and the optimal parameters of restraint system under different crash conditions are obtained.In this paper,the impact acceleration waveform is used to fuse the key factors outside the vehicle that affect the occupant injury.Combined with the numerical simulation method,the optimization design of ARS is carried out,which effectively reduces the injury risk of different occupants in different collision conditions and improves the safety of passengers.