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    Decentralized control experiments on the JPL flexible spacecraft (1990)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Decentralized control experiments were successfully demonstrated for the JPL/AFAL Flexible Structure. A simulation package using MATRIXx showed strong correlation between the simulations and experimental result, while providing a means for test and debug of the various control strategies. Implementation was simplified by a modular software design that was easily transported from the simulation environment to the experimental environment. Control designs worked well for suppression of the dominant modes of the structure. Static decentralized output feedback dampened the excited modes of the structure, but sometimes excited higher order modes upon startup of the controller. A second-order frequency shaping controller helped to eliminate excitation of the higher order modes by attenuating high frequencies in the control effort. However, it also resulted in slightly longer settling times.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Format: text
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    NASA TECHNICAL REPORTS
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    Adaptive control techniques for the SCOLE configuration (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Two adaptive controllers designed for the Spacecraft Control Laboratory Experiment (SCOLE) at NASA Langley Research Center are discussed. The first controller is an adaptive model following variable structure controller and the second is an indirect LQ adaptive controller. For each technique, the design of the controller is outlined and simulation results are presented. Plans for future studies are also discussed.
    Keywords: CYBERNETICS
    Type: VPI&SU/AIAA Symposium; Jun 29, 1987 - Jul 01, 1987; Blacksburg, VA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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