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A method for monitoring of monopile horizontal displacement of offshore wind turbine based on UWFBG and boundary reconstruction.

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Title: A method for monitoring of monopile horizontal displacement of offshore wind turbine based on UWFBG and boundary reconstruction.
Authors: Han, Heming1,2 (AUTHOR) hanheming@smail.nju.edu.cn, Meng, Zhihao3 (AUTHOR) mengzhihao@sdepci.com, Shi, Bin1,2 (AUTHOR) shibin@nju.edu.cn, Zha, Fusheng1 (AUTHOR) geozha@hfut.edu.cn, Wei, Guangqing4 (AUTHOR) wgq@nzsensing.com, Yu, Liangchen1 (AUTHOR) ylc1203@126.com, Song, Xiaojin1 (AUTHOR) 13819702066@163.com
Source: Measurement (02632241). Aug2025, Vol. 252, pN.PAG-N.PAG. 1p.
Subjects: Fiber Bragg gratings, Offshore wind power plants, Energy development, Wind power, Strain rate
Abstract: • The UWFBG is used for on-site displacement monitoring of monopile. • The boundary reconstruction is proposed for the monopile displacement calculation. • The boundary reconstruction reduces error by 80 % compared to current models. • The deformation mode change can be identified by the strain distributional feature. Ensuring the safe and reliable operation of offshore wind turbines (OWTs) is a key research focus for offshore wind energy development. The evaluation of the stability of monopiles, which are the most widely installed support structures, plays a critical role in the safe operation of offshore wind farms. Monitoring the displacement of monopiles is one of the most cost-effective approaches for evaluating their structural stability. To overcome the limitations of traditional monitoring techniques, a new method combining ultraweak fiber Bragg grating (UWFBG) and boundary reconstruction is proposed for monopile displacement monitoring. Field testing and numerical simulations were performed on an OWT monopile to validate the effectiveness of the proposed method. The results demonstrate that the UWFBG technology can automatically monitor the strain distribution of a monopile in real time, and the proposed boundary reconstruction method shows high accuracy in calculating the monopile displacement. Compared with the conventional strain–displacement calculation method, the proposed boundary reconstruction approach reduces the error by 80 % when the numerical simulation results are used as reference values. Furthermore, the rate of strain reduction with depth (k) and the bottom strain characteristics of the monopile served as key indicators for detecting changes in the monopile deformation model. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• The UWFBG is used for on-site displacement monitoring of monopile. • The boundary reconstruction is proposed for the monopile displacement calculation. • The boundary reconstruction reduces error by 80 % compared to current models. • The deformation mode change can be identified by the strain distributional feature. Ensuring the safe and reliable operation of offshore wind turbines (OWTs) is a key research focus for offshore wind energy development. The evaluation of the stability of monopiles, which are the most widely installed support structures, plays a critical role in the safe operation of offshore wind farms. Monitoring the displacement of monopiles is one of the most cost-effective approaches for evaluating their structural stability. To overcome the limitations of traditional monitoring techniques, a new method combining ultraweak fiber Bragg grating (UWFBG) and boundary reconstruction is proposed for monopile displacement monitoring. Field testing and numerical simulations were performed on an OWT monopile to validate the effectiveness of the proposed method. The results demonstrate that the UWFBG technology can automatically monitor the strain distribution of a monopile in real time, and the proposed boundary reconstruction method shows high accuracy in calculating the monopile displacement. Compared with the conventional strain–displacement calculation method, the proposed boundary reconstruction approach reduces the error by 80 % when the numerical simulation results are used as reference values. Furthermore, the rate of strain reduction with depth (k) and the bottom strain characteristics of the monopile served as key indicators for detecting changes in the monopile deformation model. [ABSTRACT FROM AUTHOR]
ISSN:02632241
DOI:10.1016/j.measurement.2025.117384