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Accommodation of practical constraints by a linear programming jet selectAn experimental spacecraft control system will be incorporated into the Space Shuttle flight software and exercised during a forthcoming mission to evaluate its performance and handling qualities. The control system incorporates a 'phase space' control law to generate rate change requests and a linear programming jet select to compute jet firings. Posed as a linear programming problem, jet selection must represent the rate change request as a linear combination of jet acceleration vectors where the coefficients are the jet firing times, while minimizing the fuel expended in satisfying that request. This problem is solved in real time using a revised Simplex algorithm. In order to implement the jet selection algorithm in the Shuttle flight control computer, it was modified to accommodate certain practical features of the Shuttle such as limited computer throughput, lengthy firing times, and a large number of control jets. To the authors' knowledge, this is the first such application of linear programming. It was made possible by careful consideration of the jet selection problem in terms of the properties of linear programming and the Simplex algorithm. These modifications to the jet select algorithm may by useful for the design of reaction controlled spacecraft.
Document ID
19830060475
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bergmann, E.
(Draper (Charles Stark) Lab., Inc. Cambridge, MA, United States)
Weiler, P.
(Charles Stark Draper Laboratory, Inc. Cambridge, MA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
AIAA PAPER 83-2209
Meeting Information
Meeting: Guidance and Control Conference
Location: Gatlinburg, TN
Start Date: August 15, 1983
End Date: August 17, 1983
Accession Number
83A41693
Funding Number(s)
CONTRACT_GRANT: NAS9-16023
Distribution Limits
Public
Copyright
Other

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