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汽车安全与节能学报

汽车安全与节能学报 ›› 2013, Vol. 4 ›› Issue (3): 266-272.DOI: 10.3969/j.issn.1674-8484.2013.03.011

• 汽车安全 • 上一篇    下一篇

行人保护柔性腿型碰撞的车辆前端结构优化设计

吕铖玮1，杨海燕1，吕晓江1，周大永1,2，刘卫国1,2   

  1. 1. 浙江吉利汽车研究院有限公司，杭州 311228，中国；2. 浙江省汽车安全控制技术重点实验室，杭州 311228，中国
  • 收稿日期:2013-06-03 出版日期:2013-09-25 发布日期:2013-06-27
  • 作者简介:吕铖玮（1987—），男（满），河北，工程师。E-mail: lvchengweixuying1@163.com
  • 基金资助:

    浙江省汽车安全技术研究重点实验室建设项目（2009E10013）

Optimization design of front-end structure for flexible legform of pedestrian protection in crash

LV Chengwei 1, YANG Haiyan 1, LV Xiaojiang 1, ZHOU Dayong 1,2, LIU Weiguo 1,2   

  1. 1. Geely Automobile Research Institute, Hangzhou 311228, China; 2. Zhejiang Key Laboratory of Automobile Safety Technology, Hangzhou 311228, China）
  • Received:2013-06-03 Online:2013-09-25 Published:2013-06-27

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摘要： 在开发某车型时，为达到2014 年欧盟新车评价规程(Euro-NCAP) 中柔性小腿（Flex PLI）碰
撞满分6的目标，对其前端结构进行优化。运用计算机辅助工程(CAE) 技术，优化前横梁吸能装置结构：
弱化孔宽度增加至35 mm，并增加压溃引导面；优化下支撑结构：去掉连接件，并将下支撑前端面厚
度减少至0.8 mm。优化后的吸能装置可以实现完全压溃，这使其本身的吸能增加22 kJ，使小腿胫骨
中上部弯矩降低106 Nm ；与优化后的下支撑相配合，小腿的中部可以向X 正向移动增加25 mm，下部
向X 正向移动减少15 mm，使内侧副韧带伸长量降低了17.8 mm。改进后的前端结构柔性小腿碰撞达
到满分。

关键词: 汽车安全、行人保护, 柔性腿型(Flex PLI) , 前端结构, 优化设计, 欧盟新车评价规程(Euro-NCAP)

Abstract: The front-end structure of a developing car was optimized to achieve the target of Flexible
Pedestrian Legform (Flex PLI) with a full mark of 6 score in a crash under the Euro-New Car Assessment
Program (Euro-NCAP). The energy-absorbing devices for front cross members and lower braced structures
were optimized using the Computer-Aided Engineering (CAE) technique. Soften-hole was widened to 35 mm,
and conduct-surface was added against press-break for energy-absorbing devices. Two connective structures
were removed from lower braced structures. The thickness oflower braced structures was reduced to 0.8 mm.
The result shows that the absorbers perform better in deformation, and absorb 22 kJ more. The tibia-mid upper
bending moment is reduced by 106 Nm. With the work of lower support, the middle part of legform moves 25
mm more in X direction while the bottom of legform moves 15 mm less in X direction, and reduces the medial
collateral ligament elongation by 17.8 mm. Therefore, a full mark 6 is obtained.

Key words: vehicle safety, pedestrian protection, flexible pedestrian legform (Flex PLI), front-end structure, optimization design, Euro-New car assessment program (Euro-NCAP)

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