3D mode shapes characterisation using phase-based motion magnification in large structures using stereoscopic DIC
3D mode shapes characterisation using phase-based motion magnification in large structures using stereoscopic DIC
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DOI：
10.1016/j.ymssp.2018.02.006
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发表时间：
2018-08-01
影响因子：
8.4
通讯作者：
Diaz, F. A.
中科院分区：
文献类型：
--
作者：
Molina-Viedma, A. J.;Felipe-Sese, L.;Diaz, F. A.
基于相位的运动放大已被提出作为一种有效的方法来可视化使用单个相机的操作偏转（ODS）。在最近的工作中，放大允许通过肉眼观察这些消耗臭氧层物质或通过使用二维数字图像相关对放大图像进行更高级的测量。全场光学技术和运动放大的组合显示出很大的潜力，改善DIC测量和提供定性和定量信息的解释消耗臭氧层物质。然而，运动放大和与2D-DIC的组合都限于平面元件经历面内运动的少数情况，主要是梁状结构。为了提供一个更普遍的应用，在这项研究中，使用立体3D-DIC的放大图像的夫妇进行测量。一个悬臂梁进行验证的目的，与数值模型的结果进行比较。之后，在一个大的弯曲面板上进行了测量应用，以显示所提出的方法的3D表征的全部能力。慢动作视频格式的可视化使人们能够直观地了解变形。所采用的方法证明是非常有用的低振幅测试，涉及使用小励磁机或高频应用。(C)2018爱思唯尔有限公司版权所有
Phase-based motion magnification has been proposed as an effective methodology to visualise Operational Deflection Shapes (ODSs) using a single camera. In recent work, magnification allowed the observation of these ODSs by naked eye or more advanced measurements on magnified images by using 2D Digital Image Correlation (DIC). The combination of a full-field optical technique and motion magnification shows a high potential improving DIC measurement and providing qualitative and quantitative information for the interpretation of ODSs. However, both motion magnification and the combination with 2D-DIC is limited to a few cases where plane elements experiences in-plane motion, mainly beam-like structures. In order to provide a more general application, in this study measurements on couples of magnified images using stereoscopic 3D-DIC were performed. A cantilever beam was employed for validation purposes, comparing the results with numerical models. Afterwards, a measurement application on a large curved panel was carried out to show full capabilities of the proposed methodology for 3D characterisation. Visualisation in slow-motion video format enables an intuitive understanding of the deformation. The adopted methodology demonstrates to be highly useful in low amplitude tests, involving the use of little exciters or high frequency applications. (C) 2018 Elsevier Ltd. All rights reserved.