董 航,黎 明,曲恒良,刘 臻.基于数字图像处理的柔性水翼形变测量[J].电子测量与仪器学报,2022,36(1):196-203 |
基于数字图像处理的柔性水翼形变测量 |
Deformation measurement of flexible hydrofoil based on digital image processing |
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DOI: |
中文关键词: 潮流能发电 柔性水翼 数字图像 边缘检测 形变测量 |
英文关键词:tidal current power generation the flexible hydrofoil digital image edge detection deformation measurement |
基金项目:山东省重点研发计划(重大科技创新工程)(2019JZZY010902)、国家自然科学基金(51761135014)项目资助 |
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中文摘要: |
针对振荡水翼式潮流能发电装置中柔性水翼的形变测量问题,设计了一套基于高速相机的非接触式测量系统,可在不
影响水翼水动力学特性的前提下,连续采集水翼运动过程中的图像并计算水翼形变。 建立了图像坐标系和水翼世界坐标系的
坐标转换模型,给出了相关参数的标定方法和形变的计算公式。 提出了一种基于 Canny 算子的水翼迎流面边缘检测方法,给出
了边界的多项式拟合算式,从而可计算出水翼迎流面边缘上任一点的形变。 设置了不同实验条件进行了验证,识别出的水翼总
长度误差在 2%以内,形变量符合实际规律。 实验结果表明该方法能够有效测量水翼迎流面边缘上任一点的形变,且具有现场
布置简单、不影响水动力学特性的优点。 |
英文摘要: |
A non-contact measurement system based on high-speed camera is designed for deformation measurement of flexible hydrofoil
in oscillating hydrofoil tidal current power generation device, which can continuously collect images and calculate hydrofoil deformation
without affecting hydrofoil hydrodynamic characteristics. The coordinate transformation model of image coordinate system and hydrofoil
world coordinate system is established, and the calibration method of relevant parameters and the formula of deformation calculation are
given. A new method of edge detection of the upstream surface of hydrofoil based on Canny operator is proposed and the polynomial
fitting formula of the boundary is given. In this way the deformation of any point on the edge of the upstream surface of the wing can be
calculated. Different experimental conditions are set to verify the results. The total length error of the identified hydrofoil is less than
2%, and the deformation is in line with the actual law. The experimental results show that the method can effectively measure the
deformation of any point on the edge of the upstream surface of the hydrofoil, and has the advantages of simple field arrangement and no
influence on the hydrodynamic characteristics. |
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