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• W2329483649 abstract "The Micro Reeling Mechanism (MTRM) developed at NASDA is able to deploy and retrieve micro-class satellites. It consists of a reel, a drive motor and a level wind mechanism, and is 100*100*200mm including a 2km long tether. The reel motor torque can be controlled to avoid slack in the tether. For this mechanism, optimal deployment and retrieval paths are calculated in advance, which minimizes the velocity of the tether, libration angle of the system and tether tension. In ground tests of the MTRM, a unique ground experiment system called the Tether Dynamics Simulator which simulates the dynamics of the tethered satellite on orbit has been assembled. This paper reports the experiment results of open-loop control for the tether deployment and retrieval to clarify the validity of the MTRM and its control algorithm. Also, the minimum configuration for a micro-class tethered satellite will be considered. BASIC IDEA OF A TETHER REELING MECHANISM Many applications have been proposed for tether-based technology such as high-atmosphere observation, electro-dynamic use, transportation and orbit transfer. Several tether missions have been conducted over the past few decades, but tether technologies are still not fully established. Cheaper, smaller satellites should be used to enhance the chance of flight demonstration. However, a tether deployment system must be approximately an order of magnitude smaller to be feasible for small satellite use. This reduction can only be achieved through an innovative deployment mechanism that is simple, lightweight and reliable. Fig. 1 illustrates a conceptual design of a 50kg class spacecraft in which a reeling mechanism will be applied. deployment and retrieval will be carried out with open-loop control along with the tether length, which is determined in advance. For long term missions, feedback control is necessary to control the libration induced by disturbing forces such as the J2 term of the Earth or air drag. However, if the mission period is short and precise position control of the subsatellite is not required, appropriate settings of the tether length profile will be enough for a stable tether deployment and retrieval. A rough estimate of the position of the subsatellite considering tether libration can be achieved by range and range rate observation at ground stations. Therefore, eliminating the feedback control system and roundabout tether route enables the tether reeling mechanism and electronics to be very small and simple." @default.
• W2329483649 created "2016-06-24" @default.
• W2329483649 creator A5075697574 @default.
• W2329483649 date "2003-09-29" @default.
• W2329483649 modified "2023-09-25" @default.
• W2329483649 title "Ground Test of Tether Deployment and Retrieval along Optimal Path with a Tether Reeling Mechanism Designed for Micro-Class Satellites" @default.
• W2329483649 cites W1988492771 @default.
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• W2329483649 doi "https://doi.org/10.2514/6.iac-03-a.6.06" @default.
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