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Proceedings Paper

Integrated intelligent control of flexible structures: analysis and experiments
Author(s): Karl D. Bilimoria; Frederick E. Garrett; Rafael Livneh; David K. Schmidt
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Paper Abstract

This study investigates the feasibility of using distributed force actuators (in addition to hub- torque) to control the tip deflection of a flexible beam-like structure during a rapid reorientation maneuver. The major objectives of the study are to assess system performance and actuator force requirements. Three feedback control schemes are compared to an open- loop control law corresponding to the rigid-body minimum-time solution. These control schemes use (1) a rate feedback hybrid controller, (2) an LQR-type hybrid controller, and (3) an LQR-type integrated controller. Comparisons between these controllers are made on the basis of actuator force required, increase in closed-loop system damping, and time required to execute a 90 degree reorientation maneuver. It was found that the rate-feedback hybrid control scheme results in high damping, but requires large peak-value forces from the actuators. The LQR-type hybrid control scheme requires lower peak-value forces from the actuators, but yields lower damping. The LQR-type integrated control scheme requires even lower actuator forces and a tip deflection that is significant only at the beginning of the maneuver, but results in an increase in the maneuver time.

Paper Details

Date Published: 8 September 1993
PDF: 12 pages
Proc. SPIE 1917, Smart Structures and Materials 1993: Smart Structures and Intelligent Systems, (8 September 1993); doi: 10.1117/12.152757
Show Author Affiliations
Karl D. Bilimoria, Arizona State Univ. (United States)
Frederick E. Garrett, Arizona State Univ. (United States)
Rafael Livneh, Arizona State Univ. (United States)
David K. Schmidt, Arizona State Univ. (United States)

Published in SPIE Proceedings Vol. 1917:
Smart Structures and Materials 1993: Smart Structures and Intelligent Systems
Nesbitt W. Hagood; Gareth J. Knowles, Editor(s)

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