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汽车安全与节能学报

汽车安全与节能学报 ›› 2017, Vol. 08 ›› Issue (01): 65-71.DOI: 10.3969/j.issn.1674-8484.2017.01.008

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行人头部撞击汽车发动机罩盖的多波峰特征与结构设计

聂冰冰1, 2，周 青1，夏 勇1   

  1. 1. 清华大学 汽车安全与节能国家重点实验室，北京 100084，中国；
    2. University of Virginia Center for Applied Biomechanics, VA 22911, USA
  • 收稿日期:2016-06-13 出版日期:2017-03-23 发布日期:2017-03-23
  • 作者简介:聂冰冰（1987—），女( 汉)，助理教授，E-mail: nbb@tsinghua.edu.cn; bn5x@virginia.edu
  • 基金资助:

    汽车安全与节能国家重点实验室开放基金（KF16172）

Multi-phase impact pulse and structure design for pedestrian headform impact on vehicle hood

NIE Bingbing1,2, ZHOU Qing1, XIA Yong1   

  1. 1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;
    2. University of Virginia Center for Applied Biomechanics, VA 22911, USA
  • Received:2016-06-13 Online:2017-03-23 Published:2017-03-23

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摘要：

为了解汽车发动机罩盖的结构设计对行人头部冲击响应的影响机理，提出了一种结构设计。根据行人头部冲击器与发动机罩盖碰撞加速度波形的多个波峰的特征，划分为不同阶段；分析了罩盖的碰撞变形过程和吸能机理，各阶段分别受罩盖随动质量、结构刚度、边界支撑及下方变形空间等因素的主导；对各主导因素进行补偿，以实现最优波形的罩盖结构设计方法。以某量产车型作为工程应用实例，给出了具有夹层板结构的发动机罩盖设计方案。结果表明：该设计能够改善行人头部碰撞保护性能，为发动机罩盖设计提供参考。

关键词: 汽车安全, 头部碰撞, 发动机罩盖, 多波峰特征, 设计策略, 夹层板结构

Abstract:

The impact response of pedestrian headform was analyzed to understand the influence of vehicle hood design in assessment tests of pedestrian protection performance. The impact pulse (acceleration-time history) of the pedestrian headform generally composed of multiple peaks. Each phase was dominated by
location specific factors, including active mass, structural stiffness, boundary constraints and deformation space under vehicle hood. Vehicle hood design shall take into account of these dominating factors under given design constraints to minimize value of the head injury criterion. As an application example, the study presented a sandwich hood structure design on a production vehicle model. The results show that the sandwich hood structure can prove capable of improving the headform protection performance compared to conventional hood.

Key words: vehicle safety, headform impactor, vehicle hood, multi-phase impact pulse, structure design strategy, sandwich structure