A Study On Rear Left Occupant Injury Under The Frontal Angle Collision Of The Car

The number of passenger vehicles in China continues to increase,and the number of road traffic accidents remains high,and property damage and casualties caused by traffic accidents are very serious.Frontal collision is one of the main forms of traffic accidents in China,and it is also an important form of collision in the study of traffic accidents and regulations in various countries.Frontal collisions include full frontal collisions,offset collisions,and oblique-angle collisions.The number of front collisions in road traffic accidents in China and the number of passengers who cause injuries are the highest.The collision of 100% frontal impact(rigid wall)and 40% overlapping variability barrier is the main form adopted by our country's frontal collision regulations.However,there are currently no provisions for oblique angle collisions in cars in China,and there are domestic and international collisions in oblique angles.The research on the rear occupant injury in the vehicle is also relatively small.In order to study the damage characteristics of the rear left occupant under oblique collision conditions,the effectiveness of the restraint system under the most severe occupant injury conditions in the oblique collision was further analyzed.In this paper,according to the test conditions of the FMVSS208 regulation of the frontal 30° angle of impact of a car against a rigid barrier,the Presys software is used to position and adjust the position of the Hybrid III50 th percentile dummy of the US LSTC.The Presys is used to establish the frontal angle collision model with different collision angles,and simulation experiments are carried out with collision angles of 10°,20°,30°,40°,50°,60°,70° and 80°.The influence of collision angle on the degree of damage of the dummy was studied using the control variable method,and the injury characteristics of the rear left occupant at different collision angles were analyzed.In this paper,The weighted damage criterion WIC was used to evaluate the comprehensive damage of the dummy,and the protective effect of the seatbelt to dummy was studied under several collision conditions with high WIC value;Subsequently,the rear-side airbag module was installed on the model under the worst collision damage condition of the dummy to analyze the impact of the side airbag on the dummy,and the side airbag was optimized to achieve a protective effect on the rear dummy.The results show that when the collision angle is between 10° and 40°,the synthetic acceleration of the dummy head decreases with the increase of the collision angle;when the collision angle is 60 °,the synthetic acceleration of the dummy's head is the highest.the main reason is that the dummy's head collides with the B-pillar on the left side of the car.The higher the internal hardness of the car,the greater the damage caused to the dummy;the neck force of the dummy basically shows that the neck force gradually decreases with the increase of the collision angle;therewas no significant change in the chest injury of the dummy.the main reason was that the rigidity characteristics of the contact with the dummy determined the size of the chest damage;the axial force of the thighs of the dummy tended to decrease with the increase of the collision angle,in different collision angles,the use of the seat belt could significantly reduce the damage of various parts of the dummy on the left side of the rear row;when the initial side airbag module was installed on the model,the damage degree of the dummy was increased.after optimizing the parameters of the side airbag module,the WIC value of the dummy on the left side of the rear row was reduced by 35.6%.