8 April 2016 Dynamic survey of wind turbine vibrations
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Six wind turbines were blown to the ground by the wind gust during the attack of Typhoon Soudelor in August 2015. Survey using unmanned aerial vehicle, UAV, found the collapsed wind turbines had been broken at the lower section of the supporting towers. The dynamic behavior of wind turbine systems is thus in need of attention. The vibration of rotor blades and supporting towers of two wind turbine systems have been measured remotely using IBIS, a microwave interferometer. However the frequency of the rotor blade can be analyzed only if the microwave measurements are taken as the wind turbine is parked and secured. Time-frequency analyses such as continuous wavelet transform and reassigned spectrograms are applied to the displacement signals obtained. A frequency of 0.44Hz exists in both turbines B and C at various operating conditions. Possible links between dynamic characteristics and structural integrity of wind turbine –tower systems is discussed.
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Chih-Hung Chiang, Chih-Hung Chiang, Keng-Tsang Hsu, Keng-Tsang Hsu, Chia-Chi Cheng, Chia-Chi Cheng, Chieh-Chen Pan, Chieh-Chen Pan, Chi-Luen Huang, Chi-Luen Huang, Tao-Ming Cheng, Tao-Ming Cheng, "Dynamic survey of wind turbine vibrations", Proc. SPIE 9804, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2016, 98040J (8 April 2016); doi: 10.1117/12.2219483; https://doi.org/10.1117/12.2219483

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