Using Frequency-Domain Methods to Identify XV-15 Aeroelastic Modes

The XV-15 Tilt-Rotor wing has six major aeroelastic modes that are close in frequency. To precisely excite individual modes during flight test, dual flaperon exciters with automatic frequencysweep controls were installed. The resulting structural data were analyzed in the frequency domain (Fourier-t...

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Bibliographic Details
Published in:SAE transactions 1987-01, Vol.96, p.1685-1697
Main Authors: Acree, C. W., Tischler, Mark B.
Format: Article
Language:English
Subjects:
Aircraft
Aircraft wings
Airspeed
Damping
Estimate reliability
Estimation methods
Flight tests
Point estimators
Transfer functions
Vehicular flight
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Summary:The XV-15 Tilt-Rotor wing has six major aeroelastic modes that are close in frequency. To precisely excite individual modes during flight test, dual flaperon exciters with automatic frequencysweep controls were installed. The resulting structural data were analyzed in the frequency domain (Fourier-transformed) with cross-spectral and transfer-function methods. Modal frequencies and damping were determined by performing curve fits to transfer-function magnitude and phase data and to cross-spectral magnitude data. Results are given for the XV-15 with its original metal rotor blades. Frequency and damping values are also compared with earlier predictions.
ISSN:0096-736X