本文之研究目的主要在於探討由中空薄圓管件所組成的超輕型航機結構在受到撞擊時之動態損傷行為及防撞性之研究。結構防撞性的設計概念常見於各類載具結構中，如汽車與火車的結構潰縮桿、飛機機腹部的結構等等。而當一個失事案例發生時，載具結構是否有足夠的抵抗能力或吸收衝擊能量的能力一直是非常重要的研究目標。因此藉由瞭解中空薄圓管件在受軸向衝擊下的動態行為模式，探討管件遭受到撞擊時之材料受力行為、吸收能量與變形量的多寡，進而預測中空薄壁管件的變形模式。
在理論研究方面，利用解析解求得撞擊平均力、位移及位移所需的時間與能量可產生的皺摺數目，並和實驗與模擬結果進行比較驗證。在數值模擬方面，利用商用有限元素分析軟體LS-DYNA中的顯示求解器進行薄圓管件衝擊實驗與超輕型航機失事案例之撞擊模擬，並與衝擊實驗的結果與失事案例的結構受損位置進行驗證比較。之後進一步對超輕型航機全機結構進行防撞性測試，並配合國內法規之規範，研究不同速度與管件厚度撞擊下，管件吸收能量與加速度值對人體的影響，並配合防撞設計指標中之人體容忍度限制標準，觀察及探討改變厚度的薄圓管件與造成人類脊椎傷害的關係。

The purpose of this study is based on analyzing dynamic impact response and crashworthiness of ultra-light aircraft which is composed of hollow thin-walled tube subjected to impact. The design of structure crashworthiness concept usually appears in several of vehicle structure such as car, bumper, train, and aircraft. Besides, most and previous theses also focus on vehicle structure that possesses the resisted ability and absorb sufficient energy during the impact process. When the thin-walled tube is subjected to axial impact, the transformation mode could be predicted by studying dynamic impact response, force, energy absorption and stroke of the tube.
On theoretical analysis view, use analytic solution to obtain mean force, stroke, duration time, energy and the collapse number. The good agreement is presented and reported for the experimental data and simulated result in our study. In addition, the explicit commercial code – LS-DYNA is utilized to solve and simulate the dynamic impact response of the hollow circular tube and the ultra-light aircraft accident. The comparison is examined for experimental result of tube and suffers injury of the accident case. By changing the impact velocity and the tube thicknesses, energy adsorptions, maximum acceleration of pilot and passenger for the Ultra-light aircraft full-scale model with deferent thicknesses of tube are represented in our simulations. The Human Tolerance Limits is adopted to describe the significant damage objective between thin-walled tube thicknesses and crush spinal damage for human.

1. Huiwen Hu, Huai-En Kao, Hsun-Chih Chu, Chengbo Wu, “ Impact simulation and analysis for KINGBIRD ultra-light aircraft ”,中華民國航空太空學會會刊, 系列B, 第37卷, 第2期, pp.68-84, 2007.
2. S.T. Jeuq, F.B. Hsiao, M.C. Chao, D.G. Zimcik and M. Nejad Ensan, “ Impact analysis of airport approach lighting towers with top-mass added ”, Transactions of the Aeronautical and Astronautical Society of the Republic of China, Vol.36, No.1, pp.007-019, 2004.
3. Alexander, J. M., “ Approximate analysis of the collapse of thin cylindrical shells under axial loading ”, Quarterly Journal of Mechanics and Applied Mathematics, 13, 10-15, 1960.
4. W. Abramowicz and N. Jones, “ Dynamic axial crushing of circular tubes ”, International Journal of Impact Engineering, Vol.2, No.3, pp.263-281, 1984.
5. W. Abramowicz and N. Jones, “ Dynamic progressive buckling of circular and square tubes ”, International Journal of Impact Engineering, Vol.4, No.4, pp.243-270, 1986.
6. N. Jones, “ Structural Impact ”, Cambridge University Press, 1989.
7. W. Abramowicz and N. Jones, “ The effective crushing distance in axially compressed thin-walled metal columns ”, International Journal of Impact Engineering, Vol.1, pp.309-317, 1983.
8. D. Al Galib and A. Limam, “ Experimental and numerical investigation of static and dynamic axial crushing of circular aluminum tubes ”, Thin-Walled Structure, 42, 1103-1137, 2004.
9. S. Poonaya, C. Thinvongpituk and U. Teeboonma, “ An analysis of collapse mechanism of thin-walled circular tubes subjected to bending ”, International Journal of Mechanical, Industrial and Aerospace Engineering, 1:3, 2007.
10. C. Thinvongpituk, S. Poonaya, S. Choksawadee and M. Lee, “ The ovalisation of thin-walled circular tube subjected to bending ”, Proceedings of the World Congress on Engineering, Vol. II, 2008.
11. S. Poonaya, U. Teeboonma and C. Thinvongpituk, “ Plastic collapse analysis of thin-walled circular tubes subjected to bending ”,Thin-Walled Structure, 47, 637-645, 2009.
12. A. G. Mamalis, “ Bending of cylindrical steel tube: numerical simulation using grid computing”, International Journal of Crashworthiness, 109-116, 2008.
13. Dennis F. Shanahan, M. D. and M.P.H, “ Basic principles of crashworthiness ”, RTO-EN-HFM-113 Pathological Aspects and Associated Biodynamic in Aircraft Accident, The Human Factor and Medicine Panel (HFM) Lecture Series, Madrid, Spain, 2004.
14. Dennis F. Shanahan, M. D. and M.P.H “ Human Tolerance and Crash Survivability ”, RTO-EN-HFM-113 Pathological Aspects and Associated Biodynamic in Aircraft Accident, The Human Factor and Medicine Panel (HFM) Lecture Series, Madrid, Spain, 2004.
15. Federal Aviation Administration, FAA Regulations, Title 14 Aeronautics and Space, Vol. 2, Chapter 1, 103.1-103.23.
16. 交通部民用航空局, 民用航空法, 第九章之一
17. 交通部民用航空局, 超輕型載具管理辦法, 第七條
18. 勢流科技股份有限公司, 結構分析軟體LS_DYNA技術講座Implicit/Explicit, 2006. (pp.38-40)
19. AIR CREATION INC., “ QUARTZ 18 BI ” type ultra-light aircraft manufacture.
20. AIR CREATION INC., “ SAFARI G-T BI ” type ultra-light aircraft manufacture.
21. ASTM E9-89a, “ Standard test methods of compression testing of metallic materials at room temperature ”, 2004.
22. CNS 12779-K6978, “ Method of test for tensile properties of glass fiber reinforced plastics ”, 1990.
23. James M. Gere, ” Mechanics of materials - sixth edition ”, 2004.
24. R. C. Hibbeler, ” Mechanics of materials - sixth edition, 2007.
25. 民用航空局, AIP 電子示飛航指南
26. C. C. Chou, “ The measurement of impact forces under dynamic crush using a drop tower test facility ”, SAE Technical Paper Series, No. 830467, 1983.
27. 胡純逢, “ 薄管元件受軸向衝擊之動態行為研究 ”, 國立成功大學航空太空工程研究所碩士論文, 2009.
28. 吳玟真, “ 輕型運動載具市場趨勢與適墜性分析 ”, 淡江大學航空太空工程所碩士論文, 2009.