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

C. W. Acree | Zendy; Mark B. Tischler | Zendy

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

Author(s) -

C. W. Acree,

Mark B. Tischler

Publication year - 1987

Publication title -

sae technical papers on cd-rom/sae technical paper series

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.295

H-Index - 107

eISSN - 1083-4958

pISSN - 0148-7191

DOI - 10.4271/872385

Subject(s) - aeroelasticity , frequency domain , computer science , structural engineering , aerodynamics , engineering , aerospace engineering , computer vision

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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