Study On Multi-angle Overlap Crash And Rollover Of SUV

In recent years,with the increasing number of cars,the road traffic has become more and more congested.As a result,the possibility of car accidents is increasing.Therefore,the safety problem of automobile collision is getting more and more attention.Two cars driving in the same direction on the traffic road may have a small Angle overlap collision with one car because one car suddenly turns or changes lanes,causing the other car to avoid.It can even cause the vehicle to roll over when it hits.Therefore,it is of great significance to study the small Angle overlap collision between two cars.There are two typical collision conditions in the small Angle overlap collision of cars: one is the small Angle overlap collision between SUV and SUV;The other is SUV and car in a small Angle overlap collision when the rollover impact condition.First,we focus on the collision problem of small Angle overlap.When using Hyper Mesh to model the collision model,we simplified the small Angle overlap collision model between SUV and SUV to the large Angle overlap collision model between SUV and the rigid wall perpendicular to the ground.The control variable method was used to set the variables as the Angle and the initial velocity of the collision,and the multi-angle overlap collision simulation test between SUV and rigid wall was established.Multi-angle overlap collision simulation test based on SUV and rigid wall perpendicular to the ground.The deformation of the front rail,the intrusion of the front coamings and the variation of the door frame shape between pillars A and B were analyzed in the process of multi-angle overlap collision.Finally,the change rule of the damage degree of SUV vehicle and occupant with the impact Angle in the multi-angle overlap collision is explained.Then,for a certain condition of collision overlap Angle,the value of the initial impact velocity is constantly changed to explore the influence of the initial impact velocity on the SUV’s multi-angle overlap collision condition.We compare and analyze the energy conversion and the damage degree of steering system at each collision Angle at the same velocity or at different initial velocities at a certain collision Angle.The final results show the influence of the overlap Angle or the initial impact velocity on the possibility of the second collision after the large Angle overlap collision with the rigid wall.The results show that in the collision condition of SUV multi-angle overlap collision with rigid wall perpendicular to the ground.With the increasing of collision Angle,the direct damage to SUV vehicle and occupant is decreasing.However,after the end of the collision,the secondary collision damage becomes larger.In the collision condition of SUV with large overlap Angle,the greater the initial velocity of the collision,the greater the direct and secondary collision injuries will be.The multi-angle overlapping collision between SUV and sedan can be simplified to the multi-angle overlapping collision between SUV and rigid wall with its own inclination.The severity of SUV roll-over under different impact angles was analyzed by the displacement of four wheels in the Z direction in the multi-angle overlap collision.And the trajectory of the SUV leaving the ground is predicted and calculated in the process of the occupant may be the maximum injury.The final results show that in the multi-angle overlap collision between SUV and rigid wall with its own inclination,the initial speed of collision and collision angle are the main factors influencing the rollover of SUV.And the severity of the collision rollover is positively correlated with the initial velocity of the collision,and negatively correlated with the collision angle.