Grid-based matching for full-field large-area deformation measurement

Du, Xian; Anthony, Brian W.; Kojimoto, Nigel

doi:10.1016/j.optlaseng.2014.10.003

Cited by 4 publications

(9 citation statements)

References 23 publications

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“…Even though the progressive dissemination of affordable digital cameras and powerful computational resources together with recent advances in image processing led finding the coordinates of the points automatically and more precisely than by hand , this technique was mainly used for measuring large displacements and strains like those occurring in composite or metal sheet forming . It is now only scarcely mentioned in recent papers such as and seems to fall progressively into disuse. The main cause is the emergence and dissemination of DIC in the experimental mechanics community .…”

Section: The Grid Method: What Are We Talking About?mentioning

confidence: 99%

The Grid Method for In‐plane Displacement and Strain Measurement: A Review and Analysis

Grédiac

Sur

Blaysat

2016

Strain

141

162

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The grid method is a technique suitable for the measurement of in-plane displacement and strain components on specimens undergoing a small deformation. It relies on a regular marking of the surfaces under investigation. Various techniques are proposed in the literature to retrieve these sought quantities from images of regular markings, but recent advances show that techniques developed initially to process fringe patterns lead to the best results. The grid method features a good compromise between measurement resolution and spatial resolution, thus making it an efficient tool to characterise strain gradients. Another advantage of this technique is the ability to establish closed-form expressions between its main metrological characteristics, thus enabling to predict them within certain limits. In this context, the objective of this paper is to give the state of the art in the grid method, the information being currently spread out in the literature. We propose first to recall various techniques that were used in the past to process grid images, to focus progressively on the one that is the most used in recent examples: the windowed Fourier transform. From a practical point of view, surfaces under investigation must be marked with grids, so the techniques available to mark specimens with grids are presented. Then we gather the information available in the recent literature to synthesise the connection between three important characteristics of full-field measurement techniques: the spatial resolution, the measurement resolution and the measurement bias. Some practical information is then offered to help the readers who discover this technique to start using it. In particular, programmes used here to process the grid images are offered to the readers on a dedicated website. We finally present some recent examples available in the literature to highlight the effectiveness of the grid method for in-plane displacement and strain measurement in real situations.

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Section: The Grid Method: What Are We Talking About?mentioning

confidence: 99%

The Grid Method for In‐plane Displacement and Strain Measurement: A Review and Analysis

Grédiac

Sur

Blaysat

2016

Strain

141

162

View full text Add to dashboard Cite

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“…Assuming that the working environment of the crane is a two-dimensional space, the location, shape, and size of all obstacles in the library are known and do not vary with the movement of the crane. In this paper, the grid method [25,26] is used to model the twodimensional Cartesian coordinate system for the slab library environment. e advantage of the Cartesian environment model is that it is easy to create and maintain.…”

Section: Slab Library Modelingmentioning

confidence: 99%

“…Charging. e Cartesian environment coordinate of the starting node is (26,33) and the ending node is (78, 10). e horizontal grid unit and vertical grid unit is set as δ � 1. e black grid in Figures 12-14 represents the obstacle area.…”

Section: Production Mode I: Slabmentioning

confidence: 99%

“…From the starting node (26,33) to the ending node (78, 10), the result shows that the CP-ACA can avoid obstacles and find an optimal path with fewer turning points, shorter paths, and no slashes in the operation of slab charging. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Mathematical Problems in Engineering 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32…”

Section: Production Mode I: Slabmentioning

confidence: 99%

“…e Cartesian environment coordinate of the starting node is (72, 25) and the coordinate of the ending node is (26,0). e black grid in Figures 24-26 indicates the obstacle area.…”

Section: Production Mode Iii: Slab Dischargingmentioning

confidence: 99%

See 2 more Smart Citations

Path Planning of Slab Library Crane Based on Improved Ant Colony Algorithm

Zhao

Weigang²,

Xiao³

et al. 2019

Mathematical Problems in Engineering

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Due to the equipment characteristics (for example, the crane of each span cannot transfer products directly to other spans and path has less turning points and no slash lines) in a slab library, slab transportation is mainly realized by manually operating the crane. Firstly, the grid method is used to model the slab library. Secondly, an improved ant colony algorithm is proposed. e algorithm is used to solve the path planning of the slab library crane, which is improved by integrating the turning points, filtering the candidate solutions, dynamically evaporating pheromone, setting the dynamic region, etc. Finally, the algorithm is applied to plan the crane path of the slab library. e results show that the obstacle-free optimal path with fewer turning points, no slash lines, and short paths is found automatically.

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Closed-loop feedback registration for consecutive images of moving flexible targets

2022

Appl Intell

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Grid-based matching for full-field large-area deformation measurement

Cited by 4 publications

References 23 publications

The Grid Method for In‐plane Displacement and Strain Measurement: A Review and Analysis

The Grid Method for In‐plane Displacement and Strain Measurement: A Review and Analysis

Path Planning of Slab Library Crane Based on Improved Ant Colony Algorithm

Closed-loop feedback registration for consecutive images of moving flexible targets

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