NDLI: A Magnetic Unloading System for an Ultra Stable Unmanned Spacecraft

Content Provider	IEEE Xplore Digital Library
Author	Rennie, R. G. Chanowitz, H. H.
Copyright Year	1963
Abstract	Many Magnetic Control or Unloading Systems have been presented at technical conferences over the past few years. Now one is a reality - a production line item - in the NASA-Grumman Orbiting Astronomical Observatory (OAO). The OAO magnetic control system utilizes the earth's magnetic field - itself a source of disturbance torque - as a spatial lever arm, upon which to transfer accumulated angular momentum in a wheel control system or to control directly the orientation of the spacecraft. No longer considered in the "tail fin" category, it ls a primary control system, the importance of which can be seen when it is compared with a pneumatic control system. This paper comments on a theoretical magnetic control system design advanced by Messrs. Paiken and Fleisig (and other authors Ref. 5,6,7), and traces the solution of equipment design problems. This includes the selection of iron core torquers, rather than large air core coils; the environmental and reliability criteria of long life spacecraft; the static and dynamic testing of the systems; and use of existing control system signal information. The discussion supplements a previous paper; "Momentum Control of the OAO Spacecraft Utilizing the Earth's Magnetic Field" by GAEC's Paiken and Fleisig. This was presented at the International Astronautical Congress, Paris, France, in September-October 1963, and described the initial block diagram design, computer simulations and studies.
Starting Page	420
Ending Page	427
Page Count	8
File Size	2603040
File Format	PDF
ISSN	05361516
Volume Number	2
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1964-04-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Space vehicles Control systems Magnetosphere Torque control Earth Magnetic fields Magnetic cores Production Observatories Wheels
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Aerospace Engineering

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