portion of the flight 中文意思是什麼

portion of the flight 解釋
飛行路線的一段
  • portion : n 1 一部分。2 一份，一般；（飯菜）一客。3 【法律】分得的財產。4 嫁妝，妝奩。5 〈僅用單數〉命運。v...
  • of : OF ＝Old French 古法語。
  • the : 〈代表用法〉…那樣的東西，…那種東西。1 〈用單數普通名詞代表它的一類時（所謂代表的單數）〉 （a） 〈...
  • flight : n 1 飛行，飛翔；（鷹對獵物的）追趕。2 （候鳥等的）遷徙；飛行的一群。3 （光陰）飛逝。4 （思想等的...
  1. Preflight - this portion of the flight starts on the ground and includes flight checks, push - back from the gate and taxi to the runway

    飛行前的準備工作? ?這部分工作是在地面完成的，包括飛機的檢修，飛機從登機口拖出來並駛往跑道。
  2. The aerospace industry, which devotes a considerable portion of its effort to research and development in the broadening realm of flight, is a leader of world technological advance

    航天工業花大力氣在日益擴展的飛行領域搞研究和開發，成為世界技術進步的先鋒。
  3. Green " s theorem is employed to find the quantity relationship among the constraints of heating rate, dynamic pressure and lift in reentry flight. the paper deduced the approximate solution of the optimal aeroassisted coplanar trajectories under the three typical constraints. the performance index to be minimized are either heat input, the total dynamic pressure, time during the atmospheric flight, the time integral of the square of the path inclination ; or maximize the time of flight during the atmospheric portion of the trajetory. an important conclusion is firstly obtained : under the three constraints above, the optimal aeroassisted coplanar transfers with the first forth kinds payoffs have the same optimal control laws

    採用格林函數法，給出了同一平面氣動力輔助變軌飛行的3種過程約束（氣動加熱率、動壓、升力約束）條件之間關系的近似定量描述形成的飛行包絡線.由此求解了航天器同時受3種約束條件時，各種性能指標下的同一平面氣動力輔助變軌軌跡的近似解及相應的最優控制規律.文中對近似解與控制規律的內部結構作了細致的分析，得到了一些有益的結論
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