基于行人腿部保护的某车型保险杠结构优化

Optimization of bumper structure of a vehicle based on pedestrian leg protection

依据2018版C-NCAP对某车型保险杠与行人腿部进行碰撞试验,发现Y=0 mm碰撞位置小腿上部弯矩T 1数值较大,未达到规定的行人腿部保护满分要求。针对这一情况,建立了行人腿部与汽车保险杠碰撞有限元模型,使用LS-DYNA软件计算求解,对仿真结果与试验结果进行比较,验证了仿真模型的准确性。依据仿真结果优化该车型保险杠结构,通过改变小腿防撞横梁的Z向宽度和在防撞泡沫上设置减弱孔,达到了更好的支撑和吸能效果。对改进后模型进行仿真,结果表明,优化方案能有效降低上部弯矩T 1的最大值,并达到C-NCAP的满分要求。

According to C-NCAP 2018 version,a collision test is conducted between the bumper of a vehicle and the leg of pedestrian.It is found that the bending moment value of the upper calf at the collision position Y=0 mm was large,which does not meet the full mark standard for the protection of the leg of pedestrian.Aiming at this situation,a finite element model of pedestrian leg collision with car bumper is established.LS-DYNA software is used to calculate and solve the problem.The simulation results are compared with the test data to verify the accuracy of the finite element model.Through the analysis of the simulation results,the bumper structure of this model is optimized and improved:by changing the Z-direction width of the lower leg anti-collision beam and setting the weakening hole on the anti-collision foam to achieve better support and energy absorption effect.The simulation results show that the optimized scheme can effectively reduce the maximum bending moment and reach the full mark requirement.