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Using Frequency-Domain Methods to Identify XV-15 Aeroelastic Modes
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English
Abstract
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 frequency-sweep 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.
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Citation
Acree, C. and Tischler, M., "Using Frequency-Domain Methods to Identify XV-15 Aeroelastic Modes," SAE Technical Paper 872385, 1987, https://doi.org/10.4271/872385.Also In
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