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Line-of-sight performance improvement with reaction-wheel isolationDesign techniques used to isolate and damp vibrations from the reaction control wheels assembly (RCA) from the structural dynamics of the Hubble Space Telescope are described. The four RCAs can generate sufficient torque for large maneuvers and precision control during fine pointing. The RCAs are to operate continuously during observations and thereby pose the potential of inducing jitter. The image stability must be constrained to less than 0.007 arcsec rms per 24 hr and pointing accuracy must be 0.01 arcsec for 100 hr. Vibration-producing characteristics of the RCAs are identified, and test results are provided from measurements of the magnitudes of the associated disturbances. Design features and test results for the vibration isolators employed with the RCAs to effect viscous damping of RCA axial perturbations are presented. The dampers are expected to reduce jitter effects of RCA operation by a half.
Document ID
19870045457
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rodden, J. J.
(Lockheed Missiles and Space Co. Sunnyvale, CA, United States)
Dougherty, H. J.
(Lockheed Missiles and Space Co. Sunnyvale, CA, United States)
Reschke, L. F.
(Lockheed Missiles and Space Co. Sunnyvale, CA, United States)
Hasha, M. D.
(Lockheed Missiles and Space Co., Inc. Space Systems Div., Sunnyvale, CA, United States)
Davis, L. P.
(Sperry Corp. Aerospace and Marine Group, Phoenix, AZ, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
AAS PAPER 86-005
Accession Number
87A32731
Funding Number(s)
CONTRACT_GRANT: NAS8-32697
Distribution Limits
Public
Copyright
Other

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