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Helicopter air resonance modeling and suppression using active controlA coupled rotor/fuselage helicopter analysis with the important effects of blade torsional flexibility, unsteady aerodynamics, and forward flight is presented. Using this mathematical model, a nominal configuration is selected with an air resonance instability throughout most of its flight envelope. A multivariable compensator is then designed using two swashplate inputs and a single-body roll rate measurement. The controller design is based on the linear quadratic Gaussian technique and the loop transfer recovery method. The controller is shown to suppress the air resonance instability throughout a wide range of helicopter loading conditions and forward flight speeds.
Document ID
19920036001
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Takahashi, M. D.
(U.S. Army, Aviation Research and Technology Activity, Moffett Field CA, United States)
Friedmann, P. P.
(California, University Los Angeles, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1991
Publication Information
Publication: Journal of Guidance, Control, and Dynamics
Volume: 14
ISSN: 0731-5090
Subject Category
Aircraft Stability And Control
Accession Number
92A18625
Funding Number(s)
CONTRACT_GRANT: NAG2-477
CONTRACT_GRANT: NAG2-209
Distribution Limits
Public
Copyright
Other

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