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A Worst-Case Approach for On-Line Flutter PredictionWorst-case flutter margins may be computed for a linear model with respect to a set of uncertainty operators using the structured singular value. This paper considers an on-line implementation to compute these robust margins in a flight test program. Uncertainty descriptions are updated at test points to account for unmodeled time-varying dynamics of the airplane by ensuring the robust model is not invalidated by measured flight data. Robust margins computed with respect to this uncertainty remain conservative to the changing dynamics throughout the flight. A simulation clearly demonstrates this method can improve the efficiency of flight testing by accurately predicting the flutter margin to improve safety while reducing the necessary flight time.
Document ID
19980017615
Acquisition Source
Armstrong Flight Research Center
Document Type
Technical Memorandum (TM)
Authors
Lind, Rick C. (NASA Dryden Flight Research Center Edwards, CA United States)
Brenner, Martin J. (NASA Dryden Flight Research Center Edwards, CA United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1998
Subject Category
Aircraft Stability And Control
Report/Patent Number
NASA/TM-1997-207056
NAS 1.15:207056
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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