车辆正面碰撞中的耐撞性能仿真分析

Simulation Analysis of Crashworthiness in Vehicle Frontal Collision

为了评价汽车在正面碰撞事故中耐撞性能,应用HyperWorks仿真软件建立了车辆正面100%碰撞有限元模型。后处理利用HyperView对B柱下端加速度、A柱上部最大折弯角、前围板侵入量以及前门铰链变形量4项重要评价指标进行仿真分析,以此评估正面碰撞中车体的耐撞性能。结果表明:B柱下端最大加速度小于3ms合成加速度72g的要求,A柱上部最大折弯角对乘员伤害程度在允许范围内,前围板变形云图小范围超出目标值,前门铰链变形量不影响碰撞后车门的正常开启,车体耐撞性能良好。类比2017年C-NCAP实车正面碰撞结果,表明仿真试验具有较高的可信性,为车体耐撞性优化设计提供依据。

For evaluating the crashworthiness of a vehicle in a frontal collision accident,A finite element model of vehicle 100%frontal collision is established by using HyperWorks software.Acceleration at the bottom of B-pillar,maximum bending angle on the upper A-pillar,dash panel intrusion and deformation on the front door hinge are four important evaluation indexes analyzed in post-processing.in this way,the crashworthiness of the vehicle body in a frontal collision is evaluated.The results show that the maximum acceleration at the bottom of B-pillar is less than the requirement of 72g synthetic acceleration in 3ms.The maximum bending angle on the upper A-pillar is within the allowable range of the occupant.Cloud dash panel intrusion is beyond the target value in a limited extend,deformation on the front door hinge is not effecting the normal opening of the door after collision,the car body has good crashworthiness.Analogous to the results of the C-NCAP real vehicle frontal collision in 2017,it shows that the simulation test has high credibility and provides a basis for the optimal design of the vehicle body crashworthiness.