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

Beberniss, Timothy J.; Ehrhardt, David A.

doi:10.1016/j.ymssp.2016.04.014

Cited by 173 publications

(80 citation statements)

References 10 publications

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“…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%

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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%

“…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%

A Space-Time PGD-DIC Algorithm:

2018

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“…The frequencies covered were at least as high as for previous reported work using a DIC system with high-speed cameras e.g. 70 Hz for reference [2] and 1060 Hz for reference [3]. It is noted that in general the low speed cameras have higher resolutions, and are thus able to measure smaller displacements resulting in less noise in the returned data.…”

Section: Resultsmentioning

confidence: 70%

“…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. An overview of non-contact modal analysis methods, including the use of high-speed DIC, is presented by Avitabile et al [4].…”

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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“…This technology is becoming more common in vibrations research with several off-the-shelf products available. The work herein was performed using the GOM ARAMIS and IVIEW products, which are discussed in [19]. The DIC system recorded the transverse displacement of the beam at 17 different positions.…”

Section: The Experimental Systemmentioning

confidence: 99%

On the experimental identification of unstable static equilibria

Wiebe

Virgin

2016

Proc. R. Soc. A.

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This paper shows how the presence of unstable equilibrium configurations of elastic continua is reflected in the behaviour of transients induced by large perturbations. A beam that is axially loaded beyond its critical state typically exhibits two buckled stable equilibrium configurations, separated by one or more unstable equilibria. If the beam is then loaded laterally (effectively like a shallow arch) it may snapthrough between these states, including the case in which the loading is applied dynamically and of short duration, i.e. an impact. Such impacts, if applied at random locations and of random strength, will generate an ensemble of transient trajectories that explore the phase space. Given sufficient variety, some of these trajectories will possess initial energy that is close to (just less than or just greater than) the energy required to cause snap-through and will have a tendency to slowdown as they pass close to an unstable configuration: a saddle point in a potential energy surface, for example. Although this closeencounter is relatively straightforward in a system characterized by a single degree of freedom, it is more challenging to identify in a higher order or continuous system, especially in a (necessarily) noisy experimental system. This paper will show how the identification of unstable equilibrium configurations can be achieved using transient dynamics.

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

Cited by 173 publications

References 10 publications

A Space-Time PGD-DIC Algorithm:

A Space-Time PGD-DIC Algorithm:

Digital Image Correlation Vibrometry with Low Speed Equipment

On the experimental identification of unstable static equilibria

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