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首页> 外文期刊>Mechanical systems and signal processing >3D mode shapes characterisation using phase-based motion magnification in large structures using stereoscopic DIC
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3D mode shapes characterisation using phase-based motion magnification in large structures using stereoscopic DIC

机译：使用立体DIC在大型结构中使用基于相位的运动放大率进行3D模式形状表征

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摘要

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.
机译：基于相位的运动放大倍率已经被提出作为一种有效的方法，可以使用单个摄像机来可视化操作偏转形状（ODS）。在最近的工作中，放大率允许使用2D数字图像相关性（DIC）通过肉眼观察这些ODS或对放大的图像进行更高级的测量。全场光学技术和运动放大倍率的结合显示了改进DIC测量的巨大潜力，并提供了用于解释ODS的定性和定量信息。但是，运动放大率以及与2D-DIC的组合都限于平面元素经历面内运动的少数情况，主要是梁状结构。为了提供更广泛的应用，在这项研究中，使用立体3D-DIC对几幅放大的图像进行了测量。使用悬臂梁进行验证，将结果与数值模型进行比较。之后，在大型弯曲面板上进行了测量应用，以显示所提出的3D表征方法的全部功能。慢动作视频格式的可视化可以直观地了解变形。所采用的方法论证明在低振幅测试中非常有用，涉及使用少量激励器或高频应用。

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