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Robust tracking of a flexible spacecraft subject to induced disturbances and parametric uncertaintiesA variable structure control technique combined with an operator spline for bilinear systems is implemented to a fast moving deformable structure for purposes of achieving robust tracking performance. The control torque applied to the structure is based on estimates of the structure parameters and on upper bounds of the model errors. For a rapid rotation of the deformable structure, the elastic response can be modeled by oscillators driven by angular acceleration, where stiffness and damping coefficients are also angular velocity and acceleration dependent. By transforming this 'slew-driven' elastic dynamics into a bilinear form, an operator spline can be constructed, that gives a low order estimate of the induced disturbance. An upper bound between the estimated deformation and the unknown exact deformation is also generated, which can be used where required in the sliding control correction.
Document ID
19900060622
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Karray, Fakhreddine
(Illinois Univ. Urbana-Champaign, IL, United States)
Dwyer, Thomas A., III
(Illinois Univ. Urbana-Champaign, IL, United States)
Kim, Jinho
(Illinois, University Urbana, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Cybernetics
Report/Patent Number
AIAA PAPER 90-3423
Meeting Information
Meeting: AIAA Guidance, Navigation and Control Conference
Location: Portland, OR
Country: United States
Start Date: August 20, 1990
End Date: August 22, 1990
Accession Number
90A47677
Funding Number(s)
CONTRACT_GRANT: F49620-87-C-0103
CONTRACT_GRANT: NAG1-613
Distribution Limits
Public
Copyright
Other

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