In-situ modal analysis by pulsed holographic interferometry

E. Bacchi; Michele Arturo Caponero; V. Casamatta; G. Ermio; F. Gagliardi; R. Rizzo; S. Spadoni; A. Terrusi

doi:10.1117/12.248662

23 August 1996 In-situ modal analysis by pulsed holographic interferometry

E. Bacchi, Michele Arturo Caponero, V. Casamatta, G. Ermio, F. Gagliardi, R. Rizzo, S. Spadoni, A. Terrusi

Proceedings Volume 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1996) https://doi.org/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.

Citation Download Citation

E. Bacchi, Michele Arturo Caponero, V. Casamatta, G. Ermio, F. Gagliardi, R. Rizzo, S. Spadoni, and 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); https://doi.org/10.1117/12.248662

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available