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Distributed processing on the Space Shuttle - A case studyA Power Extension Package (PEP) has been designed to provide additional electrical power and energy during Shuttle sortie missions. The considered investigation was conducted to determine the most suitable allocation of PEP monitoring and control functions between the Orbiter's existing (centralized) Systems Management General Purpose Computer and an embedded PEP processor. PEP monitoring and control functions are examined, and a configuration definition is considered, taking into account the 'functional migration' process, function allocation criteria, and candidate functional configurations. A trade study is conducted, giving attention to an assessment of four candidate configurations. Assessment factors are related to cost, development risk, aspects of reliability and safety, PEP design complexity, PEP/STS integration complexity, flight operations, and launch/landing site operations. A thorough (subjective) assessment of the PEP system life cycle indicates substantial benefits from a distributed processing approach.
Document ID
19820026564
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Schoonmaker, P. B.
(McDonnell Douglas Technical Services Co., Inc. Houston, TX, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1981
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
AIAA PAPER 81-2140
Meeting Information
Meeting: In: Computers in Aerospace Conference
Location: San Diego, CA
Start Date: October 26, 1981
End Date: October 28, 1981
Accession Number
82A10099
Funding Number(s)
CONTRACT_GRANT: NAS9-16105
CONTRACT_GRANT: NASA ORDER C-1322
Distribution Limits
Public
Copyright
Other

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