Mr. Jiahao Liu Profile

Jiahao Liu

at Tongji Univ

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Proceedings Article | 12 October 2022 Paper

High-speed videogrammetric technique for displacement measurement of floating offshore wind turbine model

Peng Chen, Jiahao Liu, Qingchao Zhong

Proceedings Volume 12342, 123423K (2022) https://doi.org/10.1117/12.2643248

KEYWORDS: Cameras, Motion models, High speed cameras, Control systems, 3D acquisition, Target recognition, Imaging systems, Calibration, Wind turbine technology, 3D modeling

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The issue of displacement measurement of floating wind turbine model when experiencing wind-wave loads is one important assessment indicator of stability, but conventional contact methods hardly to utilize in environment which are complex and have limited accessibility. Consequently, we develop the high-speed videogrammetry technique for displacement measurement from tremendous image sequences data, which possesses advantages of non-contact, high frame rate, three-dimensional dense measurement when compare to traditional approaches. The first, the motion of model in image sequences are acquired with the accurate target recognition and tracking algorithms. The second, the cameras interior and exterior parameters are determined through camera calibration and bundle adjustment respectively. The third, the target spatial position and displacement in X, Y, and Z directions are finally calculated based on videogrammetry theory. The experiment results demonstrate that the spatial position calculated by proposed approach can reach submillimeter accuracy in three directions when compare to high accuracy total station. In addition, the credibility of displacement results is further proved by the frequency consistence between measured and theoretical.

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