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Worst-Case Flutter Margins from F/A-18 Aircraft Aeroelastic DataAn approach for computing worst-case flutter margins has been formulated in a robust stability framework. Uncertainty operators are included with a linear model to describe modeling errors and flight variations. The structured singular value, micron, computes a stability margin which directly accounts for these uncertainties. This approach introduces a new method of computing flutter margins and an associated new parameter for describing these margins. The micron margins are robust margins which indicate worst-case stability estimates with respect to the defined uncertainty. Worst-case flutter margins are computed for the F/A-18 SRA using uncertainty sets generated by flight data analysis. The robust margins demonstrate flight conditions for flutter may lie closer to the flight envelope than previously estimated by p-k analysis.
Document ID
19980036976
Acquisition Source
Armstrong Flight Research Center
Document Type
Technical Memorandum (TM)
Authors
Lind, Rick (NASA Dryden Flight Research Center Edwards, CA United States)
Brenner, Marty (NASA Dryden Flight Research Center Edwards, CA United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1997
Subject Category
Aircraft Stability And Control
Report/Patent Number
AIAA Paper 97-1266
NASA/TM-97-207564
NAS 1.15:207564
Meeting Information
Meeting: Structures, Structural Dynamics and Materials Conference
Location: Orlando, FL
Country: United States
Start Date: April 1, 1997
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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