In-situ modal analysis by pulsed holographic interferometry

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

Research output: Contribution to conferencePaper

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.
Original languageEnglish
Publication statusPublished - 1996
Externally publishedYes
EventSecond International Conference on Vibration Measurements by Laser Techniques: Advances and Applications - , Unknown
Duration: 1 Jan 1996 → …

Conference

ConferenceSecond International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
CountryUnknown
Period1/1/96 → …

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Bacchi, E., Caponero, M. A., Casamatta, V., Ermio, G., Gagliardi, F., Rizzo, R., ... Terrusi, A. (1996). In-situ modal analysis by pulsed holographic interferometry. Paper presented at Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, Unknown.