Full-field out-of-plane vibration displacement acquisition based on speckle-projection digital image correlation and its application in damage localization

IF 3.4 Q1 ENGINEERING, MECHANICAL 国际机械系统动力学学报(英文) Pub Date : 2022-11-04 DOI:10.1002/msd2.12055
Shancheng Cao, Jinwei Yan, Haibo Nian, Chao Xu
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引用次数: 2

Abstract

Stereo-digital image correlation (Stereo-DIC) has been widely explored for modal analysis in plate-type structures due to its noncontact and full-field advantages. However, when the traditional stereo-DIC is adopted to capture the out-of-plane displacements, several challenging issues exist such as the development of surface speckles, asynchronous camera recording, and efficiency and accuracy degradation due to high computation costs. Moreover, with the captured out-of-plane displacements, effective and efficient evaluation of the high spatial resolution mode shapes and their application to damage localization are also critical problems. To tackle these issues, a speckle-projection DIC technique using a single high-speed camera is proposed to obtain the out-of-plane vibration displacements. Moreover, an enhanced peak-picking modal analysis method is adopted to enhance the estimation accuracy and efficiency of mode shapes. In addition, the low-rank property of mode shapes in an intact state and the spatial sparse property of damage locations are harnessed for the detection of damage positions without requiring reference data on the healthy state. Finally, the modal analysis and damage localization results based on the proposed speckle-projection DIC are compared with those of the traditional two-camera stereo-DIC technique to verify its feasibility and effectiveness. It is found that the differences in the identified resonant frequencies between these two methods are smaller than 1% for higher modes. Moreover, the proposed speckle-projection DIC has the same accuracy as the traditional two-camera stereo-DIC in terms of measurement accuracy, mode shape estimation, and damage localization.

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基于散斑投影数字图像相关的全场面外振动位移采集及其在损伤定位中的应用
立体数字图像相关(Stereo-DIC)由于其非接触和全视野的优势,在板型结构的模态分析中得到了广泛的应用。然而,当采用传统的立体dic捕获面外位移时,存在表面斑点的产生、异步相机记录以及计算成本高导致的效率和精度下降等问题。此外,利用捕获到的面外位移,对高空间分辨率模态振型的有效评估及其在损伤定位中的应用也是关键问题。为了解决这些问题,提出了一种利用单台高速摄像机的散斑投影DIC技术来获得面外振动位移。此外,采用了一种增强的挑峰模态分析方法,提高了模态振型估计的精度和效率。此外,在不需要健康状态参考数据的情况下,利用完整状态下模态振型的低秩特性和损伤位置的空间稀疏特性来检测损伤位置。最后,将基于散斑投影DIC的模态分析和损伤定位结果与传统双相机立体DIC技术进行了比较,验证了其可行性和有效性。结果表明,在高阶模态下,两种方法识别的谐振频率差异小于1%。此外,所提出的散斑投影DIC在测量精度、模态振型估计和损伤定位方面与传统的双相机立体DIC具有相同的精度。
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