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New Understanding of Hubble Space Telescope Gyro Current Increase Led to a Method to Save a Failing Gyro PresentationThroughout the history of the Hubble Space Telescope (HST) program, gyro current increases have been observed to occur, often times leading to gyro failure. The explanation was that debris from the surfaces of the gas bearings, with only 1.27 micron clearance, resulted in rotor restriction, which increased friction, torque, and current. However, the rotor restriction theory never could account for the fact that a restart of the gyro would restore the current back to nominal. An effort was made to understand this puzzling gyro behavior after two HST gyros exhibited increased current within the same week in November 2015. A review board was created to resolve these anomalies and generate operational procedures to potentially extend gyro life. A new understanding of gyro current behavior led to implementation of a method that could potentially save a failing gyro.
Document ID
20170008998
Document Type
Presentation
Authors
Blumenstock, Kenneth A. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
September 26, 2017
Publication Date
September 20, 2017
Subject Category
Mechanical Engineering
Report/Patent Number
GSFC-E-DAA-TN44387
Meeting Information
European Space Mechanisms and Tribology Symposium (ESMATS)(Hatfield, UK)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
mechanism

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