三维数字图像相关在旋转物体变形测量中的应用

Deformation measurement of rotating object using three–dimensional digital image correlation

  • 摘要: 旋转部件在诸多领域如交通运输、风能发电起着重要作用,三维数字图像相关方法(Three–Dimensional Digital Image Correlation, 3D–DIC)作为一种非接触光学测量手段,可获得旋转部件运转过程的全场位移、变形及振动信息,进而为故障诊断、健康监测以及气动结构优化设计提供重要的数据支撑。对近年来3D–DIC技术的发展与应用进行了全面的综述。首先介绍了3D–DIC技术的基本原理以及旋转物体变形测量系统。尤其是针对大角度旋转测量时出现的退相关问题,详细阐述了国内外学者在初值估计和形函数设计等方面做出的改进。通过对该技术的几个典型应用的介绍,展示了其相比于传统变形测量手段的优势。最后,对该技术的应用前景和发展趋势进行了展望。

     

    Abstract: Rotating structures are commonly used in the transportation and energy generation fields. As a non-contact optical measurement technique, the Three–Dimensional Digital Image Correlation (3D–DIC) allows for the full-field spatial measurement of displacement, deformation and vibration of rotating objects in operation, which provides important data support for damage detection, health monitoring and aerodynamics structural optimization design. A review of the extensive studies on the development and application of 3D–DIC is presented. First, the principle of 3D–DIC and its rotating object measurement setup are introduced. Particularly, in cases when the deformation involves a large rotation, a de-correlation problem emerges. To address this, many scholars have proposed initial value estimation and shape function design methods for large-rotation objects, which are investigated extensively here. Several application cases utilizing 3D–DIC for dam age detection and vibration measurements are introduced, showing its unique advantages compared with traditional deformation measurements methods. Lastly, the applica-tion prospect and development trend of this technology are prospected.

     

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