Tuesday, April 2, 2013
重力梯度的穩定 (又名“潮穩定”)是一種穩定人造衛星或在一個固定的方向轉軌的身體質量分佈和地球的引力場的空間範圍 。
重力梯度的穩定 (又名“潮穩定”)是一種穩定人造衛星或在一個固定的方向轉軌的身體質量分佈和地球的引力場的空間範圍 。 The main advantage over using active stabilization with propellants , gyroscopes or reaction wheels is the low use of power and resources.積極穩定的推進劑 , 陀螺儀或反應輪的主要優勢是低使用的權力和資源。
The idea is to use the Earth 's gravitational field and tidal forces to keep the spacecraft aligned in the desired orientation.我們的想法是利用地球的引力場和潮汐的力量,以保持航天器在所需的方向一致。 The gravity of the Earth decreases according the inverse-square law , and by extending the long axis perpendicular to the orbit, the "lower" part of the orbiting structure will be more attracted to the Earth.地球的重力減小的平方反比定律 ,與長軸垂直於軌道,軌道結構“低”的一部分,將被更多地吸引到地球。 The effect is that the satellite will tend to align its axis of minimum moment of inertia vertically.其效果是,該衛星將傾向於對齊其軸線垂直慣性最小的時刻 。
The first experimental attempt to use the technique on a human spaceflight was performed on September 13, 1966, on the US Gemini 11 mission, by attaching the Gemini spacecraft to its Agena target vehicle by a 100 feet (30 m) tether.在載人航天飛行中使用這項技術的第一個實驗性的嘗試,1966年9月13日對美國雙子星11號任務進行,通過附加的雙子星座飛船的Agena目標車輛由100英尺(30米)繫繩。 The attempt was a failure, as insufficient gradient was produced to keep the tether taut. [ 1 ]的嘗試是失敗的,不足梯度產生保持繫繩繃緊。 [1]
The technique was first successfully used in a near- geosynchronous orbit on the Department of Defense Gravity Experiment (DODGE) satellite in July of 1967. [ 2 ]該技術首次成功地使用在近地球同步軌道 部國防重力實驗 (DODGE)衛星,1967年7月。 [2]
It was first used for low Earth orbit and tested unsuccessfully for geosynchronous orbit in the Applications Technology Satellites ATS-2 , ATS-4 and ATS-5 from 1966 until 1969. [ citation needed ]這是第一次用於低地球軌道, 地球同步軌道中的應用技術衛星 ATS-2 , ATS-4和ATS-5從1966年到1969年[ 需要的引證和測試失敗]
An example of gravity-gradient stabilization was demonstrated during NASA's TSS-1R mission. [ not in citation given ] Just prior to tether separation, the tension on the tether was about 65 N (14.6 lbs). [ 3 ]美國航空航天局的TSS-1R使命的。重力梯度穩定的一個例子中得到充分體現,[ 不引用 ]就繫繩分離前,緊張的繫繩大約為65 N(14.6磅)。 [3]
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