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Invariant poles feedback control of flexible, highly variable spacecraft.This paper describes 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 (IPFC), feedback gains are adjusted so that the closed-loop system's characteristic equation is matched to that of a reference model; hence, closed-loop system's poles will not move - they will be invariant (provided bending frequencies and parameters can be identified accurately). This is accomplished by obtaining the system's 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's characteristic equation, and are easily programmed for the digital computer.
Document ID
19720054574
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Mendel, J. M.
(McDonnell Douglas Astronautics Co. Huntington Beach, Calif., United States)
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Subject Category
Space Vehicles
Meeting Information
Meeting: Joint Automatic Control Conference
Location: Stanford, CA
Start Date: August 16, 1972
End Date: August 18, 1972
Accession Number
72A38240
Funding Number(s)
CONTRACT_GRANT: NAS1-9566
Distribution Limits
Public
Copyright
Other

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