Identification of XV-15 aeroelastic modes using frequency-domain methods
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Identification of XV-15 aeroelastic modes using frequency-domain methods by C. W. Acree

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Published by National Aeronautics and Space Administration, Ames Research Center, US Army Aviation Systems Command, Aviation Research and Technology Activity, For sale by the National Technical Information Service in Moffett Field, Calif, [Springfield, Va .
Written in English

Subjects:

  • Tilt rotor aircraft -- Testing

Book details:

Edition Notes

Other titlesIdentification of XV 15 aeroelastic modes using frequency-domain methods.
StatementC.W. Acree, Jr., Mark B. Tischler.
SeriesNASA technical memorandum -- 101021., USAAVSCOM conference publication -- 89-A-001.
ContributionsTischler, Mark B. 1957-, Ames Research Center., United States. Army Aviation Research and Technology Activity.
The Physical Object
FormatMicroform
Pagination26 p.
Number of Pages26
ID Numbers
Open LibraryOL17633861M
OCLC/WorldCa25353317

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Using Frequency-Domain Methods to Identify XV Aeroelastic Modes The XV 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 by: 1. Get this from a library! Identification of XV aeroelastic modes using frequency-domain methods. [C W Acree; Mark B Tischler; Ames Research Center.; United States. Army Aviation Research and Technology Activity.]. The XV 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. The XV 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.

Get this from a library! Using frequency-domain methods to identify XV aeroelastic modes. [C W Acree; Mark B Tischler; United States. Army Aviation Research and . Flight modes of the XV tilt-rotor research aircraft. (a) "Airp/ane," (b) "l'i/t-rotor," (c) "Helicopter." 1. The generation of a more reliable data base of XV wing/pylon aeroelastic modes forthe original metal blades and new steel hubs 2. the incentive for a thorough reevaluation of XV aeroelastics using the latest flight-test and modal identification techniques. The major wing modes were excited with flaperon frequency sweeps.   The XV 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).

(0 NASA Technical Memorandum USAAVSCOM Technical Report A- 17 Using Frequency-Domain I Methods to Identify XV Aeroelastic Modes C. W. Acree, Jr. and Mark B. Tischler II November DTICELIECTFI.D I ' W& Gatm I US ARMY AVIATIN S SYSTEMS COMMAND National Aeronautics and O AVIATION RESEARCH AND Space Administration TECHNOLOGY ACTIVITY R8 . Identification of XV aeroelastic modes using frequency-domain methods. 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 Author: Jr. Cecil W. Acree and Mark B. Tischler. and the symmetric winglet lateral (SWL) mode is a bending of the winglets with additional bending and torsion in the wings. The main structural modes that are of interest to the research effort are the SW1B and SW1T modes. (a) (b) (c) (d) Figure 2. Longitudinal in-vacuo mode shapes for the XA (FEM configuration , version _dev,   They share research interests in system identification, signal processing, and measurement techniques. They are the coauthors of a software package with a user-friendly graphical user interface called Frequency Domain System Identification Toolbox for Matlab(r), which covers the methods discussed in this book.