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Structural Monitoring and Maintenance
  Volume 4, Number 3, September 2017, pages 221-236
open access

Vibration-based damage alarming criteria for wind turbine towers
Cong-Uy Nguyen, Thanh-Canh Huynh, Ngoc-Loi Dang and Jeong-Tae Kim

    In this study, the feasibility of vibration-based damage alarming algorithms are numerically evaluated for wind turbine tower structures which are subjected to harmonic force excitation. Firstly, the algorithm of vibration-based damage alarming for the wind turbine tower (WTT) is visited. The natural frequency change, modal assurance criterion (MAC) and frequency-response-ratio assurance criterion (FRRAC) are utilized to recognize changes in dynamic characteristics due to a structural damage. Secondly, a finite element model based on a real wind turbine tower is established in a structural analysis program, Midas FEA. The harmonic force is applied at the rotor level as presence of excitation. Several structural damage scenarios are numerically simulated in segmental joints of the wind turbine model. Finally, the natural frequency change, MAC and FRRAC algorithm are employed to identify the structural damage occurred in the finite element model. The results show that these criteria could be used as promising damage existence indicators for the damage alarming in wind turbine supporting structures.
Key Words
    wind turbine tower; vibration-based damage alarming; harmonic force excitation; modal parameters; modal assurance criterion; frequency-response-ratio assurance criterion
Cong-Uy Nguyen, Thanh-Canh Huynh, Ngoc-Loi Dang and Jeong-Tae Kim: Department of Ocean Engineering, Pukyong National University, 599-1 Daeyon-3dong, Nam-gu, Busan 608-737, Republic of Korea

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