9 March 2014 Remote monitoring and nondestructive evaluation of wind turbine towers
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Wind turbine towers are in need of condition monitoring so as to lower the cost of unexpected maintenance. Wind loading from turbulence and gusts can cause damage in horizontal axis wind turbines even the supporting towers. Monitoring of wind turbines in service using embedded data sensor arrays usually is not targeted at the turbine-tower interaction from the perspective of structural dynamics. In this study the remote monitoring of the tower supporting a horizontal-axis wind turbine was attempted using a microwave interferometer. The dominant frequency of one tower was found to be decreased by more than 20% in 16 months. Numerical modeling using spectral finite elements is in progress and should provide further information regarding frequency shift due to stiffness variation and added mass. Expected outcome will contribute to remote monitoring procedures and nondestructive evaluation techniques for local wind turbine structures during operation.
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Chih-Hung Chiang, Chih-Hung Chiang, Chih-Peng Yu, Chih-Peng Yu, Keng-Tsang Hsu, Keng-Tsang Hsu, Chia-Chi Cheng, Chia-Chi Cheng, Ying-Tzu Ke, Ying-Tzu Ke, Yi-Ru Shih, Yi-Ru Shih, "Remote monitoring and nondestructive evaluation of wind turbine towers", Proc. SPIE 9063, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2014, 90631J (9 March 2014); doi: 10.1117/12.2044942; https://doi.org/10.1117/12.2044942

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