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Development of a reaction wheel attitude control system for sounding rocket experiments and small Shuttle-based free flyersA three-axis reaction wheel control system is currently under development. Initial emphasis is on a magnetic field reference, although the system is easily adaptable to other positional references, e.g., the gyroscopic. The system is housed in a skin section 17.25 inches in diameter and approximately 10 inches long. Current weight estimate is 75 pounds. An orthogonal triad of dc motors forms the basis of the system. Power is provided by silver-zinc cells and controlled by an 8-bit microprocessor. The control law is presented and the dynamical equations derived. Simulation results show that a payload with a roll MOI of 4.1 sl/sq ft and a transverse MOI of 20.3 sl/sq ft can typically be reoriented 90 degrees in 20-35 seconds, depending upon the initial body rates.
Document ID
19870028433
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ward, P. R.
(NASA Wallops Flight Center Wallops Island, VA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
AIAA PAPER 86-2521
Accession Number
87A15707
Distribution Limits
Public
Copyright
Other

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