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Proceedings Paper

In-situ modal analysis by pulsed holographic interferometry
Author(s): E. Bacchi; Michele Arturo Caponero; V. Casamatta; G. Ermio; F. Gagliardi; R. Rizzo; S. Spadoni; A. Terrusi
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Paper Abstract

Modal analysis of a metallic specimen has been performed by use of Double Pulsed Holographic Interferometry. The specimen was excited by an electromagnetic shaking platform operating in an industrial-like environment, in day light and with severe floor vibration. A piezoelectric accelerometer was used to detect the specimen natural frequencies, Double Pulsed Holographic Interferometry was used to detect vibration modes. For each identified natural frequency, various double pulsed interferograms were made in order to obtain a sequence of fringe patterns showing a `stroboscopic' video-recording of the specimen displacement. Numerical modal analysis of the specimen was performed by use of Finite Elements Model analysis (ABAQUS s/w). Comparison between numerical and experimental results showed that the numerical model originally assumed with `no degree of freedom' at the edge fixed on the shaking platform, had to be corrected to improve the description of the real constrain. After the correction was made, very good agreement between numerical and experimental modal shapes was obtained, thus demonstrating that effective validation of numerical model can be obtained by holographic experimental measurements. The highly reliable validation obtained by use of Holographic Interferometry, is compared to the validation obtainable by classic methods based on comparison between numerical and experimental natural frequencies.

Paper Details

Date Published: 23 August 1996
PDF: 12 pages
Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); doi: 10.1117/12.248662
Show Author Affiliations
E. Bacchi, ENEA (Italy)
Michele Arturo Caponero, ENEA (Italy)
V. Casamatta, ENEA (Italy)
G. Ermio, ENEA (Italy)
F. Gagliardi, ENEA (Italy)
R. Rizzo, ENEA (Italy)
S. Spadoni, ENEA (Italy)
A. Terrusi, ENEA (Italy)

Published in SPIE Proceedings Vol. 2868:
Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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