| With the continuous increase of the number of car ownership and drivers,China’s road traffic safety is also facing severe challenges.It is one of the most common driving behaviors during driving that vehicles cut into an adjacent lane,and the driver’s improper cut-in behavior can easily cause serious traffic accidents.At present,only a few people in China have studied the cut-in accident scenario,and the corresponding research focuses more on the perspective of driving behavior.Therefore,it is urgent to carry out integrated protection of occupant in typical cut-in accident scenarios.This paper carries out research on reconstruction of typical cut-in accident scenario and simulation analysis of integrated occupant protection by means of simulation.Firstly,based on the real dangerous cut-in accident cases,the moving ruler time interpolation method and the combination of Pre Scan software are used to reconstruct the accident case scenes,and its validity is verified.All condition control strategy module and dynamic simulation scenario of cut-in accident cases are built,and the co-simulation of pre-crash phase is carried out.Secondly,the vehicle simulation model is built according to the finite element model published by NHTSA,and the accuracy of the finite element model is verified according to the test data and animation.Based on the volunteers’real vehicle test data and crash test data,the restraint system simulation model is built and the validity of the Pre-crash and In-crash simulation models are verified respectively,and then the dynamic response of the occupant and the crash injury situation are analyzed.Thirdly,an active control retractor（ACR）module is built base on the point explosion test of the active seat belt to analyze the influence of the active seat belt on the occupant’s attitude response and collision injury protection.Finally,the Kriging proxy model and multi-objective genetic algorithm combined with weighted injury criteria（WIC）are used to optimize the design of the occupant restraint system under RTA18°simulation conditions to obtain the best protection effect.The simulation results of this paper show that:When the radar test angle is 18°（RTA18°）,the intervention time of the autonomous emergency braking（AEB）system is about 145ms earlier,and the vehicle speed reduction of the subject vehicle in cases 1 and 2 is at most 15.6km/h and 24km/h,respectively.In the pre-collision phase,the posture of the occupants of the original restraint system cases 1 and 2 are changed,and the maximum displacement of head are 96.23mm and 130.13mm,respectively.In the collision phase,each part of occupants has damaged to different levels,and the damage was lower under the condition of RTA18°.After matching the active control retractor,the out-of-position of occupant in the pre-crash phase has been significantly improved,which the amount of chest dislocation in cases 1 and 2 are reduced by 14.62mm and 24.34mm,respectively.In addition,the injury of most parts of occupants in the collision has been reduced,but the left thigh force has been increased.Through the optimization results,it can be known that appropriately increasing the active preloading force,explosive preloading force and seat belt limiting force,and advancing the time of explosive preloading force and the time of airbag explosion can improve the protective effect of the restraint system.In case 1 and case 2,the left thigh forces are decreased by 9.09% and 17.42%,respectively,and the injuries to other parts of the occupant are also decreased to different levels,the HIC36 and C3ms of the occupant in case 1 are decreased by 12.19%and 12.61%,respectively,and the HIC36 and C3ms of the occupant in case 2 are decreased by 17.10%and 6.51%,respectively.Therefore,the combination of the matching and optimization of the AEB system and the occupant restraint system provide the best integrated protection effect. |
