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Optimal control study for the Space Station Solar Dynamic power moduleThe authors present the design of an optimal control system for the Space Station Freedom's Solar Dynamic Fine Pointing and Tracking (SDFPT) module. A very large state model of six rigid body modes and 272 flexible modes is used in conjunction with classical LQG optimal control to produce a full-order controller which satisfies the requirements. The results obtained are compared with those of a classically designed PID (proportional plus integral plus derivative) controller that was implemented for a six-rigid-body-mode forty-flexible-mode model. A major difficulty with designing LQG controllers for large models is solving the Riccati equation that arises from the optimal formulation. A Riccati solver based on a Pade approximation to the matrix sign function is used. A symmetric version of this algorithm is derived for the special class of Hamiltonion matrices, thereby yielding, for large problems, a nearly twofold speed increase over a previous algorithm.
Document ID
19930029136
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Papadopoulos, P. M.
(NASA Lewis Research Center Cleveland, OH, United States)
Laub, A. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Kenney, C. S.
(NASA Lewis Research Center Cleveland, OH, United States)
Pandey, P.
(California Univ. Santa Barbara, United States)
Ianculescu, G.
(NASA Lewis Research Center Cleveland, OH, United States)
Ly, J.
(Rockwell International Corp. Rocketdyne Div., Canoga Park, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: IEEE Conference on Decision and Control, 30th, Brighton, United Kingdom, Dec. 11-13, 1991, Proceedings. Vol. 3 (A93-13001 02-63)
Publisher: Institute of Electrical and Electronics Engineers, Inc.
Subject Category
Spacecraft Design, Testing And Performance
Accession Number
93A13133
Funding Number(s)
CONTRACT_GRANT: NSF ECS-87-18897
CONTRACT_GRANT: NAS3-25082
CONTRACT_GRANT: AF-AFOSR-91-0240
Distribution Limits
Public
Copyright
Other

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