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Wind and Structures
  Volume 24, Number 4, April 2017 , pages 385-403

Hybrid bolt-loosening detection in wind turbine tower structures by vibration and impedance responses
Tuan-Cuong Nguyen, Thanh-Canh Huynh, Jin-Hak Yi and Jeong-Tae Kim

    In recent years, the wind energy has played an increasingly important role in national energy sector of many countries. To harvest more electric power, the wind turbine (WT) tower structure becomes physically larger, which may cause more risks during long-term operation. Associated with the great development of WT projects, the number of accidents related to large-scaled WT has also been increased. Therefore, a structural health monitoring (SHM) system for WT structures is needed to ensure their safety and serviceability during operational time. The objective of this study is to develop a hybrid damage detection method for WT tower structures by measuring vibration and impedance responses. To achieve the objective, the following approaches are implemented. Firstly, a hybrid damage detection scheme which combines vibration-based and impedance-based methods is proposed as a sequential process in three stages. Secondly, a series of vibration and impedance tests are conducted on a lab-scaled model of the WT structure in which a set of bolt-loosening cases is simulated for the segmental joints. Finally, the feasibility of the proposed hybrid damage detection method is experimentally evaluated via its performance during the damage detection process in the tested model.
Key Words
    structural health monitoring; wind turbine tower; hybrid damage detection system; vibration responses; impedance responses
Tuan-Cuong Nguyen, Thanh-Canh Huynh, Jeong-Tae Kim: Department of Ocean Engineering, Pukyong National University, Nam-gu, Busan, Korea

Jin-Hak Yi: Coastal and Environmental Engineering Division, Korea Institute of Ocean Science and Technology, Ansan, Gyeonggi-do, Korea

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