The evaluation of the head protection abilities of helmets under impact loadings

冲击载荷下头盔头部防护能力评价

基本信息

  • 批准号:
    09450045
  • 负责人:
  • 金额:
    $ 6.98万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    1997
  • 资助国家:
    日本
  • 起止时间:
    1997 至 1999
  • 项目状态:
    已结题

项目摘要

Many requirements such as safety, lightness and comfort are necessary to helmets for sports and bike riding. Many studies regarding basic function of helmets including safety problems were reported. In the previous studies on safety problems, however, it seems to be difficult to say that those studies were accurate reviews because a helmet model integrated with a headform or a simplified helmet model different from a real one had been used in their simulations.Therefore, the purpose of this study is clearly to make a procedure that would be a useful guidance for an optimal design of helmets by using three dimensional finite element method, which can be used to estimate the influence which helmets under impact loadings affects to human head.FE models were made from the real shapes of the helmet and the headform used in the drop impact tests and were utilized in the simulations based on free drop conditions onto playing surfaces. And the analytical results of the headform acceleration fr … More om impact simulations were compared with those of experimental data. Finally, the head protection abilities of the helmet were estimated by comparing HIC(Head Injury Criterion) values from the simulation and the experiment results.The parametric studies were done to investigate the factors that had the main effects to the headform acceleration. From this study, it could be possible to decide the required conditions of the physical parameters which are important in the optimal design of helmets under impact loading.The results of this research are summarized as follows:(1)Three dimensional finite element model of the helmet and the headform were constructed from the 3 dimensional measurements of the configuration of the tested helmet and the headform.(2)It is found that the acceleration responses in the headform according to the simulation results are in good agreement with those of test results. Also the head protection abilities of the helmet are evaluated by comparing the HIC values from the headform acceleration. Especially, it is found that the HIC values from the collision onto the hemispherical anvil are smaller than those from the collision onto flat anvil in any case of drop heights.(3)The parametric studies were conducted to investigate what factor affects the main influences to the headform acceleration. It is considered that Young's modulus of the liner is the main factor which affects to the headform acceleration. From the results of the parametric studies, it is considered that the main factors necessary to the optimal design of helmets can be determined.(4)It is considered that the basic problems in the simulation of helmets under impact loadings are solved by this study. Further studies would be required by taking non-linearity of the materials and viscoelasticity of the liner into account. Less
许多要求,如安全,轻便和舒适是必要的头盔运动和骑自行车。许多关于头盔基本功能的研究,包括安全问题的报道。然而,在以前的安全问题研究中,似乎很难说这些研究是准确的评论,因为在他们的模拟中使用了与人头模型集成的头盔模型或与真实的头盔不同的简化头盔模型。本研究目的是利用三维有限元方法,为头盔的优化设计提供一个有用的指导根据头盔和头盔模型的真实的形状建立有限元模型,并在自由跌落条件下进行仿真。并给出了人头模型加速度fr的解析结果 ...更多信息 OM冲击模拟与实验数据进行了比较。最后,通过比较仿真和实验结果的HIC(Head Injury Criterion)值,对头盔的头部防护能力进行了评估,并对影响头盔头部加速度的主要因素进行了参数研究。本文的主要研究成果如下:(1)通过对头盔和人头模型的三维测量,建立了头盔和人头模型的三维有限元模型。(2)It研究发现,仿真结果得到的人头模型加速度响应与试验结果吻合较好。通过比较头盔在头部模型加速度下的HIC值,评价了头盔的头部防护能力。特别是,它被发现,从碰撞到半球形砧的HIC值小于那些从碰撞到平砧在任何情况下的跌落高度。(3)对影响人头模型加速度的主要因素进行了参数研究。分析认为衬板的弹性模量是影响人头模型加速度的主要因素。从参数研究的结果,它被认为是必要的头盔的优化设计的主要因素可以确定。(4)It认为该研究解决了头盔在冲击载荷作用下模拟的基本问题。考虑到材料的非线性和内衬的粘弹性,需要进一步的研究。少

项目成果

期刊论文数量(20)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
宇治橋貞幸、伊能教夫、小暮拓: "衝撃力をうけるスポーツ用ヘルメットの頭部保護性能"日本スポーツ産業学会 スポーツ産業学研究第6回学会大会号. 67-70 (1997)
Sadayuki Ujibashi、Norio Ino、Taku Kogure:“受到冲击力的运动头盔的头部保护性能”日本体育产业学会,第 6 届体育产业研究年会,第 67-70 号(1997 年)
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    0
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  • 通讯作者:
Sadayuki Ujihashi, Kazuo Takakuda, Hiroo Miyairi, Cheong-Woong Ko, Tutomu tominaga and Hiroyoshi Hirakawa: "Mechanical simulation of head Injuries"Journal of Oromaxilofacial Biomechanics. Vol. 4, No. 1. 22-23 (1999)
Sadayuki Ujihashi、Kazuo Takakuda、Hiroo Miyairi、Cheong-Woong Ko、Tutomu tominaga 和 Hiroyoshi Hirakawa:“头部损伤的机械模拟”Journal of Oromaxilofacial Biomechanics。
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    0
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Cheol-Woong Ko, Sadayuki Ujihashi, Kazuo Takakuda, Koshiro Ono, Hiroyuki Mituishi, David Nash: "Dynamic Responses of Helmets for Sports in Falling Impact onto Playing Surfaces"The Engineering of Sports. (2000)
Cheol-Woong Ko、Sadayuki Ujihashi、Kazuo Takakuda、Koshiro Ono、Hiroyuki Mituishi、David Nash:“运动头盔在坠落到比赛表面时的动态响应”运动工程。
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    0
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Sadayuki Ujihashi, Kazumoto Doi, Taku Kogure and Norio Inou: "Head Protection Abilities of Helmets in Impact"Proceedings of JSME Bioengineering Conference. No. 97-72. 662-663 (1998)
Sadayuki Ujihashi、Kazumoto Doi、Taku Kogure 和 Norio Inou:“冲击中头盔的头部保护能力”JSME 生物工程会议论文集。
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    0
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Sadayuki Ujihashi, Norio Inou and Taku Kogure: "Head Protection Abilities of Helmets in Impacts with the Surfaces"Journal of Japan Society of Sports Industry. 67-70 (1997)
Sadayuki Ujihashi、Norio Inou 和 Taku Kogure:“头盔在与表面碰撞时的头部保护能力”日本体育产业学会杂志。
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    0
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UJIHASHI Sadayuki其他文献

UJIHASHI Sadayuki的其他文献

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{{ truncateString('UJIHASHI Sadayuki', 18)}}的其他基金

Energy Absorption Abilities of Members by Dynamic Loading
动载荷下构件的能量吸收能力
  • 批准号:
    08045031
  • 财政年份:
    1996
  • 资助金额:
    $ 6.98万
  • 项目类别:
    Grant-in-Aid for international Scientific Research
Method of Measurement and Evaluation for the Mechanical Characteristics of Running Shoes
跑鞋力学特性的测量与评价方法
  • 批准号:
    06559007
  • 财政年份:
    1994
  • 资助金额:
    $ 6.98万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
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