Stability enhancement for control of flexible space structures

This paper demonstrates the application of linear-quadratic-Gaussian/ loop transfer recovery (LQG/LTR) techniques to the active control of a flexible spaceborne optical support structure. LQG compensators are designed for three actuator/ sensor placements on the structure in the context of an 18-mod...

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Bibliographic Details
Published in:IEEE Control Systems Magazine 1986-06, Vol.6 (3), p.19-26
Main Authors: Kissel, G., Hegg, D.
Format: Article
Language:English
Subjects:
Actuators
Frequency
Laboratories
Optical control
Optical sensors
Reduced order systems
Robust stability
Robustness
sensors
spacecraft
stability
Transducers
Wideband
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Summary:This paper demonstrates the application of linear-quadratic-Gaussian/ loop transfer recovery (LQG/LTR) techniques to the active control of a flexible spaceborne optical support structure. LQG compensators are designed for three actuator/ sensor placements on the structure in the context of an 18-mode reduced-order structural model. The state-feedback (LQ) portion of each design meets stringent line-of-sight performance requirements in the face of two wide-band disturbances impinging on the structure. Conditions on the open-loop transfer matrix, broken at the plant input, are stated which make more robust the response of the LQG designs to the 132 high-frequency elastic modes excluded from the design model. Through loop transfer recovery, with LQ dynamics as the goal, closed-loop stability in the presence of all 150 elastic modes is maintained for two of the actuator/sensor selections. Difficulties in achieving performance robustness are noted.
ISSN:0272-1708
2374-9385
DOI:10.1109/MCS.1986.1105093