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Advanced AFCS developments on the XV-15 tilt rotor research aircraftThe design criteria and control and handling qualities of the Automatic Flight Control System (AFCS), developed in the framework of the XV-15 tilt-rotor research aircraft, are evaluated, differentiating between the stability and control criteria. A technically aggressive SCAS control law was implemented, demonstrating that significant benefits accrue when stability criteria are separated from design criteria; the design analyses for application of the control law are presented, and the limit bandwidth for stabilization in hovering flight is shown to be defined by rotor or control lag functions. Flight tests of the aircraft resulted in a rating of 3 on the Cooper-Harper scale; a possibility of achieving a rating of 2 is expected if the system is applied to the yaw and heave control modes.
Document ID
19850049862
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Churchill, G. B.
(U.S. Army, Aeromechanics Laboratory, Moffett Field CA, United States)
Gerdes, R. M.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1984
Subject Category
Aircraft Stability And Control
Accession Number
85A32013
Distribution Limits
Public
Copyright
Other

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