頭盔墊料受撞擊時之能量吸收力分析及對超輕量強化機車安全帽開發之研究

The Analysis in Energy Absorption Ability during Motor-Helmet Impacting and The Development for Super Light Strengthened Motor-Helmet

陳世昇(Shih-Sheng Chen)

指導教授 ： 洪興林

崑山科技大學/工程學院/機械工程研究所/碩士(2008年)

摘要

避免機車騎士頭、臉部傷害，最有效的方法就是佩戴機車頭盔。為能製造出合乎市場需求、經濟便宜且堅固耐用之機車頭盔，利用電腦模擬了解撞擊時頭盔之動態行為是必要的。其中，頭盔墊料因職司撞擊能量之吸收，故於機車頭盔之設計具有非常關鍵的地位。
本論文目的為分析頭盔墊料受撞擊時之能量及對超輕量強化機車安全帽之開發提供有價值之建議。其方法為：利用有限元素分析軟體(LS-DYNA)執行模擬，研究頭盔在接受E.C.E.標準撞擊測試程序時之動態行為，並找出能吸收此衝擊能量之最適當的墊料最佳外型組合。首先，利用壓縮-拉伸實驗及模擬比對找出帽殼及頭盔墊料之材料參數。再根據電腦模擬結果，探討各種不同的頭盔墊料外型之撞擊頭部傷害指數(Head Injury Criterion)及撞擊最大加速度值(Peak Acceleration)，並且評估於各種不同的頭盔墊料外型，頭盔承受衝擊時吸收動態能量及衝擊加速度值的能力。分析結果初步顯示：頭盔墊料挖溝槽對於衝擊能量的吸收有非常明顯的助益。同時，不同溝槽尺寸及數目有不同的衝擊能量吸收效果。分析結果最後顯示：墊料溝槽數目在於3條、墊料溝槽深度在於20mm及適當之溝槽寬度為最佳的頭盔墊料外型組合。

關鍵字

機車頭盔 ； 頭盔墊料 ； 吸收衝擊能量 ； 最佳外型組合

並列摘要

When traffic accident occurs, the most effective method to protect motorcycle knight is to wear the helmet. With the purpose of decreasing of cost of manufacture which conform the market demand, sturdy and more durable motorcycle helmet, accurate computer simulation, in order to understand the dynamic behavior of the helmet is essential while striking. Moreover, because of the functional impact energy absorption, an effective helmets liner plays an important role in the design of motorcycle helmet.
The purpose of this thesis was to analyze energy absorption ability during motor-helmet impacting and develope for super light strengthened motor-helmet. By using the software (LS-DYNA), optimal configuration of helmet liner was found under the implementation of E.C.E. standard testing procedures. Firstly, material parameters of shell and helmets liner were constructed with the help of compression-tensile test and comparison of simulation results. Then, according to the head injury criterion and maximum acceleration value during striking of helmet obtaining from computer simulation, the ability of dynamic energy absorption for different shape liner, were evaluated. The initiate results reveal that helmet ditch has significantly effect to the impact energy absorption. Furthermore, size and number of ditch affected impact energy absorption obviously. The results also reveal that number of ditches and depth of ditch are set to 3 and 20mm, seems to be the optimal shape combination of helmets liner.

並列關鍵字

Motorcycle Helmet ； Helmets Liner ； Absorption Impact Energy ； Optimal Shape Combination

參考文獻

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