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    Title: 飛機在低空風切下之飛行軌跡分析
    Other Titles: Airplane's Trajectory Analysis under the Influence of Low Level Wind Shear
    Authors: 宛同;Wan, Tung;朱永彰;Chu, Y. C.
    Contributors: 淡江大學航空太空工程學系
    Keywords: 低空風切;飛行軌跡Wind shear;Flight trajcetory
    Date: 1999-03
    Issue Date: 2013-03-20 16:35:28 (UTC+8)
    Publisher: 臺南市:中國航空太空學會
    Abstract: 低空風切(Low Level wind shear)一直是航空工程學者研究的重點,其對飛行安全的影響已引起世人的廣泛注意,而影響飛行安全的因素不外乎機械因素、人爲因素、及環境因素,低空風切其本質即是屬於環境因素,遭遇低空風切時又需要飛行員憑藉其高超的飛行技巧及經驗以安全穿越,事前對飛行員教育訓練之人爲因素亦不可忽略。
    對於飛行軌跡之分析,較早之研究工作多將問題集中於高度之控制上,先假設飛機爲大氣中之一質點,更進而忽略飛機之側向運動,如此簡化無法考慮到側風對飛行軌跡之影響。當飛機以非對稱軸(nonsymmetry axis)方式穿越風切風場時,其側風之強度對飛機之影響實不可忽略。本文試圖以非線性之六自由度剛體運動方程式來模擬Boeing 747客機在風切中之運動情形,也就是飛機在三度空間之飛行中,飛行姿態角的變化一併計算在內。而在流場模擬上,較早之研究者多參考Ivan建立之穩態流場,本文參考Wan之模式,利用環狀渦漩流建立一非穩態之低空風切流場,與真實流場分佈極爲接近。
    此外,對於飛機遭遇低空風切後之飛行策略,本文以不同之推力與姿態角進行交叉模擬分析,並參考FAA之建議,探討飛機在以非對稱軸式穿越低空風切時之適當飛行軌跡,應參考飛機之標準進離場程序轉向,以使飛機能順利自低空風切風場中改出,最後之結論與Avila並不盡相同。
    Low level wind shear always is the focus of aviation research, and its hazard to flight safety arise people's concern.
    Most of prior research on low level wind shear focus on flight altitude control, and assumed that the airplane is a point mass in the atmostphere. This research use nonlinear six degrees of freedom rigid body equation of motion to simulate airplane's flight conditions under the influence of low level wind shear, that is when the airplane fly in three dimensional space, its attitude angle must be calculated in the equation of motion. Finally, we hope to find proper flight trajectory by analyzing numerical results which simulate airplane's flight condition in different initial value of attitude angle and thrust. The results presented here confirm the FAA "wind shear training aid" but are slightly different from Avila's conclusion, and the authors hope this result can help to improve flight safety.
    Relation: 中國航空太空學會學刊=Transactions of the Aeronautical and Astronautical Society of the Republic of China 31(1),頁1-10
    Appears in Collections:[航空太空工程學系暨研究所] 期刊論文

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