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Estimation of Modal Parameters Using a Wavelet-Based ApproachModal stability parameters are extracted directly from aeroservoelastic flight test data by decomposition of accelerometer response signals into time-frequency atoms. Logarithmic sweeps and sinusoidal pulses are used to generate DAST closed loop excitation data. Novel wavelets constructed to extract modal damping and frequency explicitly from the data are introduced. The so-called Haley and Laplace wavelets are used to track time-varying modal damping and frequency in a matching pursuit algorithm. Estimation of the trend to aeroservoelastic instability is demonstrated successfully from analysis of the DAST data.
Document ID
19970040858
Acquisition Source
Armstrong Flight Research Center
Document Type
Reprint (Version printed in journal)
Authors
Lind, Rick (NASA Dryden Flight Research Center Edwards, CA United States)
Brenner, Marty (NASA Dryden Flight Research Center Edwards, CA United States)
Haley, Sidney M. (NASA Dryden Flight Research Center Edwards, CA United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1997
Subject Category
Aircraft Stability And Control
Report/Patent Number
NASA/TM-97-206300
H-2214
NAS 1.15:206300
Report Number: NASA/TM-97-206300
Report Number: H-2214
Report Number: NAS 1.15:206300
Meeting Information
Meeting: Atmospheric Flight Mechanics Conference
Location: New Orleans, LA
Country: United States
Start Date: August 8, 1997
End Date: August 11, 1997
Sponsors: American Inst. of Aeronautics and Astronautics
Accession Number
97N31956
Funding Number(s)
PROJECT: RTOP 505-63-50
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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