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Numerical simulation of the helium gas spin-up channel performance of the relativity gyroscopeThe dependence of the spin-up system efficiency on each geometrical parameter of the spin-up channel and the exhaust passage of the Gravity Probe-B (GPB) is individually investigated. The spin-up model is coded into a computer program which simulates the spin-up process. Numerical results reveal optimal combinations of the geometrical parameters for the ultimate spin-up performance. Comparisons are also made between the numerical results and experimental data. The experimental leakage rate can only be reached when the gap between the channel lip and the rotor surface increases beyond physical limit. The computed rotating frequency is roughly twice as high as the measured ones although the spin-up torques fairly match.
Document ID
19930064645
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Karr, Gerald R.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Edgell, Josephine
(Alabama Univ. Huntsville, United States)
Zhang, Burt X.
(Air Products and Chemicals, Inc. Gardner Cryogenics Dept., Lehigh Valley, PA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Advances in cryogenic engineering. Vol. 37B - Proceedings of the 1991 Cryogenic Engineering Conference, Univ. of Alabama, Huntsville, June 11-14, 1991 (A93-48578 20-37)
Publisher: Plenum Press
Subject Category
Spacecraft Instrumentation
Accession Number
93A48642
Funding Number(s)
CONTRACT_GRANT: NAS8-36955
Distribution Limits
Public
Copyright
Other

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