應用影像量測方法建立結構桿件之位移場與應變場

葉風

doi:10.6342/NTU201801757

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應用影像量測方法建立結構桿件之位移場與應變場

Applications of Image-Based Measurements to Establish Displacement and Strain Fields of Structural Elements

葉風 , Masters　　Advisor：張家銘　　

繁體中文 DOI： 10.6342/NTU201801757

Abstract │ Reference (27) │ Altmetrics

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With the advancement and popularization of the photography technology, high resolution images can yield much more information from nowadays. In this study, we collect, analyze, and apply digital image measurements to extract some structural information (e.g., deformations and strains). Digital image measurements are typically non-contact and non-destructive, and this method can measure displacements of bridges or buildings which have difficulties to instrument displacement-type sensors. To extract displacements from digital images, this study mainly applies two computer vision techniques: 1) Pearson correlation coefficients and 2) Feature points. The idea of these two techniques is to compare the pixels between two images. A reference image refers to the basis to be compared with. These two techniques basically compute the correlation of pixel points of an image with the reference image. Then, the pixels that have the greatest correlation with the reference image result in the movement of an object by calculating its Pearson correlation coefficients or feature points. This study introduces the theories of image processing and computer vision associated with digital image correlation and then analyzes the structural members in terms of displacements and strains. To construct displacement and strain fields of structural members, the LED targets, which are originally used in another optical instrumentation, namely the Krypton coordinate measurement machine, are adopted to estimate surface deformations. The estimated deformations are compared with the Krypton results, while the strains are obtained from various finite element-based methods to the calculated displacements. As found in the results, the proposed approach in this research is feasible to establish a displacement or strain field of a structural member subjected to dynamic or pseudo-dynamic loading.

Reference ( 27 ) 〈TOP〉

[1] Chu T.C., Ranson W.F. and Sutton M.A. (1985), “Applications of Digital-Image Correlation Techniques to Experimental Mechanics,” Experimental Mechanics, 25(3), 232–244.
[2] Vendroux G. and Knauss W.G. (1998), “Submicron Deformation Field Measurements: Part 2. Improved Digital Image Correlation,” Experimental Mechanics, 38(2), 86–92.
[3] Peters W.H. and Ranson W.F. (1982), “Digital Imaging Techniques in Experimental Stress Analysis, ” Optical Engineering, 21, 427-432
[4] Sutton M.A., Wolters W.J., Peters W.H., Ranson W.F. and McNeill S.R. (1983), “Determination of Displacements Using an Improved Digital Correlation Method,” Image and Vision Computing, 1, 133-139,
[5] Sutton M.A., Wolters W.J., Peters W.H., Ranson W.F. and McNeill S.R. (1986), “Application of an Optimized Digital Image Correlation Method to Planar Deformation Analysis,” Image and Vision Computing, 4, 143-150.

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