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Decentralized control experiments on NASA's flexible gridMethods arising from the area of decentralized control are emerging for analysis and control synthesis for large flexible structures. In this paper the control strategy involves a decentralized model reference adaptive approach using a variable structure control. Local models are formulated based on desired damping and response time in a model-following scheme for various modal configurations. Variable structure controllers are then designed employing co-located angular rate and position feedback. In this scheme local control forces the system to move on a local sliding mode in some local error space. An important feature of this approach is that the local subsystem is made insensitive to dynamical interactions with other subsystems once the sliding surface is reached. Experiments based on the above have been performed for NASA's flexible grid experimental apparatus. The grid is designed to admit appreciable low-frequency structural dynamics, and allows for implementation of distributed computing components, inertial sensors, and actuation devices. A finite-element analysis of the grid provides the model for control system design and simulation; results of several simulations are reported on here, and a discussion of application experiments on the apparatus is presented.
Document ID
19870026120
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ozguner, U.
(Ohio State Univ. Columbus, OH, United States)
Yurkowich, S.
(Ohio State Univ. Columbus, OH, United States)
Martin, J., III
(Ohio State Univ. Columbus, OH, United States)
Al-Abbass, F.
(Ohio State University Columbus , United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Subject Category
Cybernetics
Accession Number
87A13394
Funding Number(s)
CONTRACT_GRANT: NASA ORDER L-91188-B
Distribution Limits
Public
Copyright
Other

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