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Controller reduction for effective interdisciplinary design of active structuresControl problems of large aerospace structures are intrinsically interdisciplinary and require strategies which address the complete interaction between flexible structures, electromechanical actuators and sensors, and feedback control algorithms. Current research and future directions which will require an interdisciplinary team effort in dynamics, control and optimization of such structures are being surveyed. It is generally agreed that the dynamics of space structures require large scale discrete modeling, resulting in thousands of discrete unknowns. Proven control strategies, on the other hand, employ a low order controller that is based on a reduced order model of structures. Integration of such low order controllers and large scale dynamics models often leads to serious deterioration of the closed loop stability margin and even instability. To alleviate this stability deterioration while low order controllers remain effective, the following approach was investigated: (1) retain low order controllers based on reduced order models of structures as the basic control strategy; (2) introduce a compensator that will directly account for the deterioration of stability margin due to controller-structure integration; and (3) assess overall performance of the integrated control structure system by developing measures of suboptimality in the combination of (1) and (2). The benefits include: simplicity in the design of basic controllers, thus facilitating the optimization of structure control interactions; increased understanding of the roles of the compensator so as to modify the structure as well as the basic controller, if necessary, for improved performance; and adaptability to localize controllers by viewing the compensator as a systems integration filter.
Document ID
19900011761
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Balas, Mark J. (Colorado Univ. Boulder, CO, United States)
Quan, Ralph (Colorado Univ. Boulder, CO, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1989
Publication Information
Publication: NASA, Langley Research Center, NASA(DOD Controls-Structures Interaction Technology 1989
Subject Category
Spacecraft Design, Testing And Performance
Accession Number
90N21077
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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