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汽车安全与节能学报

汽车安全与节能学报 ›› 2010, Vol. 1 ›› Issue (4): 297-306.DOI: 10.3969/j.issn.1674-8484.2010.04.008

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车体前端造型及材料对于行人腿部伤害指标的影响

赵正，陈超卓，吴沈荣   

  1. 奇瑞汽车股份有限公司 汽车工程研究院， 芜湖 241009
  • 收稿日期:2010-07-12 出版日期:2010-12-20 发布日期:2010-12-20
  • 作者简介:赵正（1983—），男（汉），山东，硕士。E-mail:zhaozheng1@mychery.com

Influence of the vehicle front sculpt and bumper foam on#br# pedestrian leg injury index

ZHAO Zheng, CHEN Chaozhuo, WU Shenrong   

  1. Automotive Engineering Institute, Chery Automobile Co., Ltd, Wuhu 241009, China
  • Received:2010-07-12 Online:2010-12-20 Published:2010-12-20
  • About author:第一作者/ First author： 赵正（1983—），男（汉），山东，硕士。E-mail:zhaozheng1@mychery.com

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摘要： 研究了车体前端造型、空间布置等参数以及前保险杠材料的选取对在行人—车辆碰撞时行人腿部伤害指
标的影响。对于欧洲新车评价规程（Euro NCAP）工况下，行人保护小腿和大腿碰撞实验，采用有限元瞬态分析程序
LS-DYNA，数值模拟分析了行人腿部的受力以及损伤机理。用计算机辅助工程(Computer Aided Engineering，CAE)
准静态加载曲线，与实验结果对比，验证模型正确性。考查不同泡沫材料对小腿胫骨加速度、弯曲角度和剪切位移
的影响；考查不同的发动机罩前缘高度、保险杠前缘长度、发动机罩刚度和水箱上横梁x向位置等参数，对大腿轴
向力和弯曲力矩的影响。结果表明：在EPP、PU 和STRAND 三种泡沫材料中，EPP 材料的刚度特性更有利于行人小腿
保护，当泡沫x向厚度、密度和z向安装高度发生变化时，胫骨加速度的变化趋势较复杂，没有明确规律；弯曲角度
和剪切位移的变化趋势比较一致，呈现单调的变化趋势；大腿伤害值受发动机罩刚度影响较小，受其他因素影响较大。

关键词: 行人—车辆碰撞, 行人保护, 腿部, 有限元, 前保险杠, 泡沫材料, 车体前端造型

Abstract:  In pedestrian-car impact, front bumper materials, the vehicle sculpt, package and layout play a key role in pedestrian
leg protection. The stress and injury mechanism of the leg was analyzed and the test procedure specified in Euro NCAP (New
Car Assessment Programme) was simulated using large-scale nonlinear dynamic finite element program LS-DYNA 3D. The FE
(Finite Element) model was validated by comparing CAE (Computer Aided Engineering) and test results. The influence of foam
on the tibia acceleration, bending angle and shearing distance of the lower leg form was investigated by altering the x-direction
thickness, density, and z-direction mounting position of the foam. The influence of parameters on the sum of axis forces and bending
moment of the upper leg form was investigated by altering the bonnet lead edge (BLE) height, bumper lead, stiffness of hood and
x-direction mounting position of upper radiator beam. The results indicate that the stiffness property of EPP foam is more beneficial
for pedestrian protection among three types of foam (EPP, STRAND, PU). When the x-direction thickness, density, and z-direction
mounting position of the foam are changed, the trend of the the tibia acceleration is complex without clear pattern, while the trend of
the bending angle and shear distance are fairly constant and monotonic. The hood stiffness is less important to the upper leg injury,
while the other factors have significant effects.

Key words: pedestrian-car impact, pedestrian protection, leg, finite element, front bumper, foam material, vehicle front sculpt

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