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Application of variable-gain output feedback for high-alpha controlA variable-gain, optimal, discrete, output feedback design approach that is applied to a nonlinear flight regime is described. The flight regime covers a wide angle-of-attack range that includes stall and post stall. The paper includes brief descriptions of the variable-gain formulation, the discrete-control structure and flight equations used to apply the design approach, and the high performance airplane model used in the application. Both linear and nonlinear analysis are shown for a longitudinal four-model design case with angles of attack of 5, 15, 35, and 60 deg. Linear and nonlinear simulations are compared for a single-point longitudinal design at 60 deg angle of attack. Nonlinear simulations for the four-model, multi-mode, variable-gain design include a longitudinal pitch-up and pitch-down maneuver and high angle-of-attack regulation during a lateral maneuver.
Document ID
Document Type
Technical Memorandum (TM)
Ostroff, Aaron J.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1990
Subject Category
Aircraft Stability And Control
Report/Patent Number
NAS 1.15:102603
Accession Number
Funding Number(s)
PROJECT: RTOP 505-66-01-02
Distribution Limits
Work of the US Gov. Public Use Permitted.
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