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

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. Keywords: Tilt rotor aircraft.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1987
Accession Number
ADA194156

Entities

People

  • C. W. Acree Jr.
  • Mark B. Tischler

Organizations

  • Ames Research Center

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Airframes
  • Army Aviation
  • Computer Programs
  • Control Systems
  • Curve Fitting
  • Frequency
  • Frequency Domain
  • Frequency Response
  • Research Aircraft
  • Resonant Frequency
  • Standards
  • Strain Gages
  • Structural Response
  • Test Methods
  • Tilt Rotor Aircraft
  • Transfer Functions

Fields of Study

  • Physics

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Seismology
  • Structural Dynamics.