3D digital image correlation methods for full-field vibration measurement

Helfrick, Mark; Niezrecki, Christopher; Avitabile, Peter; Schmidt, Tim

doi:10.1016/j.ymssp.2010.08.013

Cited by 371 publications

(160 citation statements)

References 20 publications

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“…It is worth noting that 3D SLDV combining three laser scan heads can estimate complex mode shapes exhibiting three-dimensional displacements. However, this technique remains relatively expensive and is sensitive to large rigid body motion of the specimen [18]. For these reasons, SLDV is mostly used in 1D to measure out-of-plane velocities.…”

Section: Introductionmentioning

confidence: 99%

“…The disadvantage is that the measurement resolution is, in general, not comparable with that of the tools mentioned above [18,5,32]. Special attention must therefore be paid to reducing measurement uncertainties when attempting to develop a new DIC method in this context.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, the authors generally use SDIC with high-speed cameras to analyze dynamic tests with a harmonic excitation [34,38,15], a shock [34,18] or a random excitation [34,18,39,5,32]. From full field displacement measurements, different mode shapes are extracted by using e.g.…”

Section: Introductionmentioning

confidence: 99%

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A Space-Time PGD-DIC Algorithm:

2018

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The aim of this study is to develop a new regularized Digital Image Correlation (DIC) method for time dependent measurements. The correlation problem is written as a minimization problem over the space-time domain in a general formulation including 2D-DIC and Stereo DIC (SDIC). The unknown time-resolved displacement field is found as a sum of products of space and time functions, similarly to the Proper Generalized Decomposition in computational mechanics. It is shown that the space fields are less sensitive to noise as time regularity acts as a physical regularization of the space fields. The proposed method is illustrated by vibration measurement under harmonic excitation in 2D-DIC and SDIC.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Space-Time PGD-DIC Algorithm:

2018

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“…Recent years have seen the use of DIC in conjunction with high-speed cameras to capture the mode shapes of vibrating objects via a continuously-captured sequence of images. For example, Helfrick et al [1] compare and contrast modal analysis via high-speed DIC with impact tests and laser vibrometry, while Wang et al [2] use high-speed DIC in conjunction with random excitation as the basis of establishing modal parameters. Beberniss et al [3] describe the use of DIC with high-speed cameras to analyse the response to random excitation.…”

Section: Introductionmentioning

confidence: 99%

Digital Image Correlation Vibrometry with Low Speed Equipment

Warburton

Buss

et al. 2016

Exp Mech

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A low-cost method is presented which enables digital image correlation (DIC) with conventional cameras (i.e. not high-speed) to be used for determination of vibration deflected shapes via the use of a stroboscopic lamp and some simple ancillary circuits. For each natural frequency of the structure under consideration, a sequence of images is captured asynchronously with the vibrations using the DIC system and the resulting displacement fields are correlated with the excitation signal driving the vibration using a least-squares approach. Three approaches for performing this correlation are outlined, one of which is developed into the algorithm used for processing the present results to obtain the amplitude and phase of the vibration at each point on the specimen, allowing the deflected shape to be reconstructed. This process is illustrated using the example of a vibrating aluminium plate. The resulting shapes and frequencies agree well with finite element modal analyses of the plate.

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“…The SLDV can capture the same number of points but sequentially and therefore increasing the acquisition times. Helfrick et al 3 produced a paper about the 3D full-field approach using the DIC measurement method. The technique is definitely an alternative for vibration measurements performed by SLDV systems but some disadvantages are also presented.…”

Section: Introductionmentioning

confidence: 99%

Experimental validation of a newly designed 6 degrees of freedom scanning laser head: Application to three-dimensional beam structure

Maio

Copertaro

2013

Review of Scientific Instruments

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A new scanning laser head is designed to use single Laser Doppler Vibrometer (LDV) for performing measurements up to 6 degrees of freedom (DOF) at a target. The scanning head is supported by a rotating hollow shaft, which allows the laser beam to travel up to the scanning head from an opposite direction where an LDV is set up. The scanning head is made of a set of two mirrors, which deflects the laser beam with an angle so that the rotation of the scanning head produces a conical scan. When measurements are performed at the focal point of the conical scan then three translational vibration components can be measured, otherwise the very small circle scan, before and after the focal point, can measure up to 6 degrees of freedom, including three translations and three rotations. This paper presents the 6DOF scanning head and the measurements of 3D operational deflection shapes of a test structure.

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3D digital image correlation methods for full-field vibration measurement

Cited by 371 publications

References 20 publications

A Space-Time PGD-DIC Algorithm:

A Space-Time PGD-DIC Algorithm:

Digital Image Correlation Vibrometry with Low Speed Equipment

Experimental validation of a newly designed 6 degrees of freedom scanning laser head: Application to three-dimensional beam structure

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