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 frequency-sweep controls were installed. The resulting structural data were analyzed in the frequency domain (Fourier...

Full description

Saved in:
Bibliographic Details
Main Authors: Acree, C W , Jr, Tischler, Mark B
Format: Report
Language:English
Subjects:
AEROELASTICITY
AUTOMATIC
CONTROL
DAMPING
FLIGHT TESTING
Fluid Mechanics
FREQUENCY
METALS
PHASE
ROTOR BLADES
STRUCTURAL PROPERTIES
SWEEP FREQUENCY TECHNIQUES
TILT ROTOR AIRCRAFT
TRANSFER FUNCTIONS
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
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 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. Keywords: Tilt rotor aircraft.