电子测量与仪器学报

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

DOI：

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

作者	单位
董航	1. 中国海洋大学工程学院，2. 山东省海洋智能装备工程研究中心
黎明	1. 中国海洋大学工程学院，2. 山东省海洋智能装备工程研究中心
曲恒良	1. 中国海洋大学工程学院，2. 山东省海洋智能装备工程研究中心
刘臻	1. 中国海洋大学工程学院，2. 山东省海洋智能装备工程研究中心

Author	Institution
Dong Hang	1. College of Engineering, Ocean University of China,2. Shandong Ocean Intelligent Equipment Engineering Research Center
Li Ming	1. College of Engineering, Ocean University of China,2. Shandong Ocean Intelligent Equipment Engineering Research Center
Qu Hengliang	1. College of Engineering, Ocean University of China,2. Shandong Ocean Intelligent Equipment Engineering Research Center
Liu Zhen	1. College of Engineering, Ocean University of China,2. Shandong Ocean Intelligent Equipment Engineering Research Center

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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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