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Invariant poles feedback control of flexible highly variable spacecraft.Description of a technique for single-axis control of a model of a highly flexible space station. Active damping of lower frequency flexibility modes is employed. In the control technique, referred to as invariant poles feedback control, feedback gains are adjusted so that the closed-loop system characteristic equation is matched to that of a reference model. Hence closed-loop system poles will not move; they will be invariant (provided that bending frequencies and parameters can be identified accurately). This is accomplished by obtaining the system characteristic equation in closed form; equating respective coefficients between terms of like powers in s in the system and reference model characteristic equations; and solving for the feedback gains. The feedback gains are explicit functions of system plant parameters and the coefficients of the reference model characteristic equation, and are easily programmed for the digital computer.
Document ID
19730028720
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mendel, J. M.
(McDonnell Douglas Astronautics Co. Huntington Beach, Calif., United States)
Date Acquired
August 7, 2013
Publication Date
December 1, 1972
Publication Information
Publication: IEEE Transactions on Automatic Control
Volume: AC-17
Subject Category
Electronics
Accession Number
73A13522
Funding Number(s)
CONTRACT_GRANT: NAS1-9566
Distribution Limits
Public
Copyright
Other

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