Research On The Safety Of The Co-driver Based On Energy Analysis

The rapid growth of car ownership has made the management of road traffic increasingly difficult,and the traffic safety problems have become increasingly severe.The safety performance of automobiles has also received wide attention from all walks of life.Most of the previous studies on the safety of car occupants focused on the drivers.In fact,the co-driver have a higher risk than the drivers in many cases.Among the various forms of vehicle impact,the front impact has the highest proportion.Therefore,it is of great practical significance to study the safety of the co-drivers in front impact.In view of the above problems,based on the energy analysis of the co-drivers during the front impact,this paper studies the safety of co-drivers in the front 100%overlap rigid barrier impact(full front impact)and the 40%overlap deformable barrier impact(offset impact).The work is as follows:(1)The simulation model of the full front impact and the offset impact on the front passenger side is established in the MADYMO software,and the validity of the model is verified.(2)The energy and energy transfer paths of the passenger’s side dummy in the two impact conditions are analyzed,and the energy absorption of the restraint subsystems on the co-drivers is obtained,and the energy analysis method of this paper is determined.(3)Using the Latin hypercube sampling method,30 sets of experiments were designed for the full front impact and the offset impact respectively.The energy absorption curves of the constrained subsystems under two conditions were obtained by energy analysis.The relationship between the occupant weighted injure criterion WIC and the peak and peak times of the energy absorption curves of each constraint subsystem is analyzed.The results show that under the full front impact,WIC is negatively correlated with the peaks and peak times of energy absorption curves of airbags,and peak times of energy absorption curves of the pelvis belts,seat.WIC is positively correlated with the peak of the curve of energy absorption of shoulder belt.Under the offset impact,the WIC has a negative correlation with the peak and peak time of energy absorption curve of the airbag,and has a negative correlation with the peak time of energy absorption curve of shoulder belt and pelvis belt.And WIC is positively correlated with the peak of energy absorption curve of the shoulder belt.(4)Select the he peak time of energy absorption curves of airbag,shoulder belt and pelvis belt that have high correlation with the passenger-side occupant WIC under the two working conditions.Refer to the relationship between WIC and the peak times of these three restraint subsystems,calculate the weighted average_W of the the peak times of these three restraint subsystems,and establish the response surface model of_W and constraint system parameters under two impact conditions.The multi-objective optimization of the constrained system under two impact conditions is based on controlling_W under two impact conditions.After optimization,the WIC value of the co-driver side dummy decreased by 14.5%in full front impact and the WIC in the offset impact,case decreased by 21.1%.