High-speed 3D digital image correlation vibration measurement: Recent advancements and noted limitations

Timothy J. Beberniss, David A. Ehrhardt

Research output: Contribution to journalArticle (Academic Journal)peer-review

71 Citations (Scopus)

Abstract

A review of the extensive studies on the feasibility and practicality of utilizing high-speed 3 dimensional digital image correlation (3D-DIC) for various random vibration measurement applications is presented. Demonstrated capabilities include finite element model updating utilizing full-field 3D-DIC static displacements, modal survey natural frequencies, damping, and mode shape results from 3D-DIC are baselined against laser Doppler vibrometry (LDV), a comparison between foil strain gage and 3D-DIC strain, and finally the unique application to a high-speed wind tunnel fluid–structure interaction study. Results show good agreement between 3D-DIC and more traditional vibration measurement techniques. Unfortunately, 3D-DIC vibration measurement is not without its limitations, which are also identified and explored in this study. The out-of-plane sensitivity required for vibration measurement for 3D-DIC is orders of magnitude less than LDV making higher frequency displacements difficult to sense. Furthermore, the digital cameras used to capture the DIC images have no filter to eliminate temporal aliasing of the digitized signal. Ultimately DIC is demonstrated as a valid alternative means to measure structural vibrations while one unique application achieves success where more traditional methods would fail.
Original languageEnglish
JournalMechanical Systems and Signal Processing
Early online date4 May 2016
DOIs
Publication statusE-pub ahead of print - 4 May 2016

Keywords

  • Digital image correlation
  • Laser vibrometry
  • Random vibration
  • Modal analysis

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