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Actuator placement by degree of controllability including the effect of actuator massVarious concepts of the degree of controllability (DOC) have been previously developed for the purpose of choosing actuator locations in the control of large flexible spacecraft. A perturbation technique is presented to efficiently account for the actuator mass in the computation of the fuel-optimal, time-optimal, and energy-optimal DOC definitions. Methods are developed for computing each of the three DOCs, when the mass of the actuator is nonnegligible. The energy-optimal DOC is employed to find optimal actuator locations for a large spacecraft under study by the NASA Langley Research Center. The mass of the actuator is seen to have a significant effect on the optimal actuator locations and is shown to spread the actuator locations more evenly for large mass actuators. Results indicate that when the actuator mass is large when compared to the structural mass it should be included in selecting actuator locations.
Document ID
19910039116
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Longman, R. W.
(Columbia University New York, United States)
Horta, L. G.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1989
Subject Category
Cybernetics
Meeting Information
Meeting: VPI&SU Symposium
Location: Blacksburg, VA
Country: United States
Start Date: May 8, 1989
End Date: May 10, 1989
Accession Number
91A23739
Distribution Limits
Public
Copyright
Other

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