Real-time flutter analysis of an active flutter-suppression system on a remotely piloted research aircraftFlight-test results of the first three flights of an aeroelastic research wing are described. The flight flutter-test technique used to obtain real-time damping estimates from fast-frequency sweep data was obtained and the open-loop flutter boundary determined. Nyquist analyses of sweep maneuvers appear to provide additional valuable information about flutter suppression system operation, both in terms of phase-margin estimates and as a means of evaluating maneuver quality. An error in implementing the flutter-suppression system required in a one-half nominal gain configuration, which caused the wing to be unstable at lower Mach numbers than anticipated, and the vehicle experienced closed-loop flutter on its third flight. Real-time flutter-testing procedures were improved.
Document ID
19830022109
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gilyard, G. B. (NASA Ames Research Center Moffett Field, CA, United States)
Edwards, J. W. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 11, 2013
Publication Date
February 1, 1983
Publication Information
Publication: AGARD Ground(Flight Test Tech. and Correlation