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題名 | Optimal Abort Landing Trajectories for a High-Angle-of-Attack Windshear Encounter=風切遭遇下最佳化之高攻角中止降落飛行軌跡 |
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作 者 | 曾慶耀; | 書刊名 | 力學 |
卷期 | 11:1 1995.03[民84.03] |
頁次 | 頁75-81 |
分類號 | 447.8 |
關鍵詞 | 風切; 高攻角飛行; 中止降落; 最佳航跡; Windshear; High-angle-of-attack fight; Abort landing; Optimal flight path; |
語文 | 英文(English) |
中文摘要 | 飛機於降落階段遭遇低空風切時,若仍保有相當之高度,多半採取中止降落措施 ,立即拉高機首快速爬升,以避免風切中降落。然而若採拉高機首,快速爬升之高攻角飛行 可能會因位能之快速增加、動能減少,導致速度升力損失過大而造成墜毀。本文即對高攻角 快速爬升飛行策略進行討論,以了解遭遇風切時,若立即增加攻角對於飛行安全之影響,並 找出最佳之飛行策略。 |
英文摘要 | Adopting the abort landing instead of penetration landing is preferable for an aircraft landing approach, if the altitude of aircraft is sufficiently high when the presence of a windshear is detected. The pilot frequently initiates the abort landing process by a rapid ascending, high-angle-of-attack flight strategy to avoid a windshear encounter at lower altitudes. However, an excessive altitude gain is followed by a subsequent loss in the kinetic energy. Hence, the loss in speed results in a severe loss of lift, and typically, the abort landing plan is doomed to fail. The suggested optimal recovery technique being characterized by a rapid descent in the angle of attack from the stick-shaker value, then followed by a gradual increase in the angle of attack, is capable of recovering the aircraft from the undesirable high potential energy state having resulted from the initiation of a high-angle-of-attack flight upon the windshear onset. |
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