Research On Head And Neck Protection Of Passengers Sitting Laterally In Frontal Accident

With the increase in the number of cars in China,the number of vehicle collision accidents has increased.Among them,the number of front collision accidents is close to half,which is worthy of attention.With the trend of automatic driving,the seating position of the occupants in the cockpit will become diversified.The occupant in the car turns on the automatic driving mode.After the steering wheel is retracted into the dashboard,the occupant’s frontal collision occurs when sitting sideways.The injury of the occupant is worthy of attention.Because the head and neck positions are very common in collision accidents,it is also the cause of death in most accidents.The reason,so the focus of this study is on the human head and neck.The purpose of this study is to establish a model of the head and neck of the occupant with high biological fidelity.After verification,it is used with the instrument panel,front glass,and airbag to build a occupant cabin model that the occupant is colliding with in a lateral sitting position,and then to study different front impact strengths.The head and neck of the lower occupant are injured,and a four-point seat belt is designed.Compared with the three-point seat belt,the reverse three-point seat belt and the four-point seat belt protect the head and neck during the frontal collision of the occupant in a lateral sitting position,and analyze the head and neck of the occupant.Department of injury response in the case of different seat belts.This paper considers three kinds of front bumping speeds(40km/h,50km/h,60km/h),analyzes the head and neck injuries of the occupants under the three speeds and three middle cabin models,and mainly analyzes the head displacement,rotation angle,acceleration,The maximum stress of the vertebral body,the maximum stress of the intervertebral disc and the maximum compressive stress.After comparing the protection effects of the three seat belts,it was found that the four-point seat belt has a good effect on reducing head and neck displacement,acceleration and cervical spine stress,and its comparison with the reverse three-point seat belt shows that the fourpoint seat belt protection Comprehensiveness.Reverse three-point seat belts are acceptable in low-speed collisions(40km/h),but poor protection in high-speed collisions(60km/h),occupant safety cannot be guaranteed,and occupants equipped with two three-point seat belts.There is a possibility of sliding out of the seat during a front bump,which increases the risk of occupant injury.In contrast,the four-point seat belt can protect the occupant from leaving the seat,making the risk reduced and controllable.Through the stress analysis of the cervical spine,it is found that the maximum stress of the axial vertebra and the vertebral spine is relatively large,the compressive stress on the right edge of the nucleus pulposus is relatively large,and the stress values on the left and right sides of the fibrous ring are relatively large,which may cause injury.On this basis,the restraint protection system of the occupant in the lateral sitting position can be improved to reduce the possible injury to the occupant,and to better ensure the safety of the occupant in the automatic driving mode.