23 August 1996 In-situ modal analysis by pulsed holographic interferometry
Author Affiliations +
Proceedings Volume 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1996); doi: 10.1117/12.248662
Event: Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1996, Ancona, Italy
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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
E. Bacchi, Michele Arturo Caponero, V. Casamatta, G. Ermio, F. Gagliardi, R. Rizzo, S. Spadoni, A. Terrusi, "In-situ modal analysis by pulsed holographic interferometry", Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); doi: 10.1117/12.248662; https://doi.org/10.1117/12.248662
PROCEEDINGS
12 PAGES


SHARE
KEYWORDS
Finite element methods

Holographic interferometry

Modal analysis

Fringe analysis

Holography

Data modeling

Interferometry

Back to Top