Comparison of DIC and LDV for practical vibration and modal measurements

We compare laser Doppler vibrometry (LDV) and digital image correlation (DIC) for use in full-field vibration and modal testing. This was done using a simultaneously measured 3D displacement field on a flat 7-in. corner-supported metal plate using pseudorandom excitation via a shaker. We complete a...

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Bibliographic Details
Published in:Mechanical systems and signal processing Vol. 86; no. PB; pp. 2 - 16
Main Authors: Reu, Phillip L., Rohe, Daniel P., Jacobs, Laura D.
Format: Journal Article
Language:English
Published: United Kingdom Elsevier Ltd 01.03.2017
Elsevier
Subjects:
DIC
Digital image correlation
Laser Doppler vibrometry
LDV
Modal
Vibration
Vibration
Laser Doppler vibrometry
Modal
Digital image correlation
DIC
LDV
ISSN:0888-3270, 1096-1216
Online Access:Get full text
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Summary:We compare laser Doppler vibrometry (LDV) and digital image correlation (DIC) for use in full-field vibration and modal testing. This was done using a simultaneously measured 3D displacement field on a flat 7-in. corner-supported metal plate using pseudorandom excitation via a shaker. We complete a detailed comparison between the techniques and discuss the pros and cons of each. The results show that either technique can be used for quantifying the modal information with the LDV providing better out-of-plane displacement resolution and equivalent in-plane resolution. The strain calculation is considered better in the DIC approach due to the direct tie to the surface displacements. While the LDV does not lose its place as the gold standard for modal testing, DIC has introduced a new and competitive approach that will have significant advantages in certain testing regimes.
Bibliography:AC04-94AL85000
USDOE National Nuclear Security Administration (NNSA)
ISSN:0888-3270
1096-1216
DOI:10.1016/j.ymssp.2016.02.006