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Liquid Angular-Momentum CompensatorReport discusses use of fluid-loop reaction ring as part of system orienting spacecraft. Proposed device imparts angular rotation to spacecraft by reacting against liquid contained in loop. Pump, or pumps, provide impetus to both spacecraft and fluid. Hydraulic accumulators and valves added to control flow. Technique offers better control than attitude-control thrusters. Several advantages in applications otherwise requiring large, rigid reaction wheel: Fluid loop need occupy only peripheral circulation path; does not necessarily require motor sized for maximum torque; does not require difficult-to-make bearings specified to withstand high launch-acceleration loads, provide high stiffness, operate smoothly, and exert minimal fractional torque. Unlike reaction wheel, fluid loop not balanced dynamically.
Document ID
19890000256
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Iskenderian, Theodore C.
(Caltech)
Date Acquired
August 14, 2013
Publication Date
May 1, 1989
Publication Information
Publication: NASA Tech Briefs
Volume: 13
Issue: 5
ISSN: 0145-319X
Subject Category
Machinery
Report/Patent Number
NPO-17204
Accession Number
89B10256
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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