Research on wind turbine blade damage based on pre-stressed FBG strain sensors

Yujie Cai, Zhiquan Yang, Bihua Zhang, Yufeng Wei

Optoelectronics Letters ›› 2024, Vol. 20 ›› Issue (2) : 83-88.

Optoelectronics Letters ›› 2024, Vol. 20 ›› Issue (2) : 83-88. DOI: 10.1007/s11801-024-3093-6
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Research on wind turbine blade damage based on pre-stressed FBG strain sensors

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Abstract

One of the essential parts of a wind power generator that captures wind energy is the wind turbine blade. The safety of the blades rapidly declines as a wind turbine’s operating period grows. For real-time monitoring, a chip-type pre-stressed fiber Bragg grating (FBG) strain sensor was fabricated. The sensor’s structure was improved using simulation analysis along with optimization. It was discovered through calibration trials that the pre-stressing method expanded the sensor’s range of measurement, guaranteed overall linearity, and prevented the potential hysteresis phenomena during compression. The sensor’s final sensitivity was calculated to be 1.970 pm/µε, and its linear fitting coefficient was 0.999. Finally, the sensor was used to monitor the wind turbine blades and the strain change curve of the root of a normally functioning blade is found to be a sine curve, which provides a certain reference value for judging whether the blade is damaged in the future.

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Yujie Cai, Zhiquan Yang, Bihua Zhang, Yufeng Wei. Research on wind turbine blade damage based on pre-stressed FBG strain sensors. Optoelectronics Letters, 2024, 20(2): 83‒88 https://doi.org/10.1007/s11801-024-3093-6

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