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Proceedings Paper

Modal analysis of an aircraft fuselage panel using experimental and finite-element techniques
Author(s): Gary A. Fleming; Ralph D. Buehrle; Olaf L. Storaasli
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Paper Abstract

The application of electro-optic holography (EOH) for measuring the center bay vibration modes of an aircraft fuselage panel under forced excitation is presented. The requirement of free-free panel boundary conditions made the acquisition of quantitative EOH data challenging since large scale rigid body motions corrupted measurements of the high frequency vibrations of interest. Image processing routines designed to minimize effects of large scale motions were applied to successfully resurrect quantitative EOH vibrational amplitude measurements from extremely noisy data. EOH and scanning laser doppler vibrometer results have been used to validate and update finite element models of the fuselage panel. Various modeling techniques were evaluated for characterization of the panel normal modes at frequencies up to 1000 Hz. These models are briefly described, and comparisons between computational predictions and experimental measurements are presented.

Paper Details

Date Published: 1 June 1998
PDF: 12 pages
Proc. SPIE 3411, Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (1 June 1998); doi: 10.1117/12.307740
Show Author Affiliations
Gary A. Fleming, NASA Langley Research Ctr. (United States)
Ralph D. Buehrle, NASA Langley Research Ctr. (United States)
Olaf L. Storaasli, Newport News Shipbuilding (United States)


Published in SPIE Proceedings Vol. 3411:
Third International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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