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    Volume 47, Issue 3 (December 2018)

    Special Issue Paper

    Remote Measurements and Vibration Analysis of Existing Wind Turbines

    (Received 11 January 2018; accepted 26 September 2018)

    Published Online: 20 December 2018

    CODEN: JTEVAB

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    Abstract

    Extreme weather is a constant threat to the service of a wind turbine, as it may cause damage to the rotor blades or even lead to the collapse of a supporting tower. A change in the dominant frequency may indicate a deviation from the design of the stiffness of the turbine-tower system. Dynamic measurements of the lateral displacement of four 2-MW wind turbines of the same model have been obtained using a ground-based microwave interferometer. Vibration analysis, including frequency domain decomposition and reassigned spectrograms, is undertaken to evaluate the frequency contents of a turbine-tower system. Dominant frequency, along with other peak frequencies, is readily identified when the rotor is stopped or operated at low to medium speed. Dynamic characteristics found in the vibration analysis are closely examined to identify indicators of structural deficiency in the supporting tower of a wind turbine. The results are promising as they combine noncontact dynamic measurements and vibration analysis for the condition assessment of wind turbine tower systems. Preliminary numerical results also indicate possible further enhancement of the proposed vibration analysis, using the relation curve that highlights the discrepancy percentage of normalized deflections with respect to the change in stiffness of the supporting tower of a wind turbine.

    Author Information:

    Chiang, Chih-Hung
    Center for NDT and Department of Construction Engineering, Chaoyang University of Technology, Wufong, Taichung

    Hsu, Keng-Tsang
    Center for NDT and Dept Construction Engineering, Chaoyang University of Technology, Wufong, Taichung

    Yu, Chih-Peng
    Department of Civil Engineering, National Chung Hsin University, Taichung

    Cheng, Chia-Chi
    Center for NDT and Dept Construction Engineering, Chaoyang University of Technology, Wufong, Taichung

    Pan, Jie-Zhen
    Center for NDT and Dept Construction Engineering, Chaoyang University of Technology, Wufong, Taichung


    Stock #: JTE20180025

    ISSN:0090-3973

    DOI: 10.1520/JTE20180025

    Author
    Title Remote Measurements and Vibration Analysis of Existing Wind Turbines
    Symposium ,
    Committee E07