碰撞中乘员有无抓握顶棚扶手下的伤害对比分析

目前在利用假人研究碰撞过程车内人员损伤程度试验中,未考虑假人抓握顶棚扶手时对人体损伤评定产生的影响,针对该问题基于LS-PREPOST和Oasys PRIMER软件建立汽车副驾驶室和具有手部抓握能力的数字假人模型,通过添加实车碰撞测试中B柱加速度曲线,模拟正面碰撞过程中加速度场,并对自由坐姿状态下和抓握顶棚扶手状态下的假人主要部位进行损伤程度对比分析。仿真结果表明,假人在抓握顶棚扶手的情况下头部合成加速度峰值和头部损伤程度指数(head injury criteria,HIC)与自由坐姿状态下假人相比降低了6.1%和30.2%,同时颈部最大剪切力、拉伸力和弯矩力分别降低了87.4%、76.9%、42.9%,胸部最大压缩量降低了16.9%。研究结果可为碰撞中被动安全领域的研究提供参考。

A Comparative Analysis of the Injuries of the Occupants Grasping the Roof Armrest or Not in Collision

At present, in the study of human body injury in the collision with dummy, the influence ofroof handrails grasping state is not considered.Therefore, the software of LS-PREPOST and Oasys PRIM-ER are used to build model of automobile cockpit and dummy with hand grip ability,The acceleration e-nvironment of frontal crash is simulated by adding B-pillar acceleration curve from real vehicle crash te-st.Comparing injuries of dummies in free sitting posture and holding the roof armrest in collision.The si-mulation results show that when the dummy was grasping the roof armrest, the peak value of head acc-eleration and HIC values were 6.1% and 30.2% lower than the dummy was sitting freely, the maximumvalue of shear force, tensile force and bending moment of the neck were reduced by 87.4%, 76.9% and42.9% respectively, and the maximum value of chest compression was reduced by 16.9%. The results pr-ovide a reference for the research of passive safety in collision.