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Smart Structures and Systems   Volume 15, Number 2, February 2015, pages 283-297
Electromechanical impedance-based long-term SHM for jacket-type tidal current power plant structure
Jiyoung Min, Jin-Hak Yi and Chung-Bang Yun

Abstract     [Buy Article]
    Jacket-type offshore structures are always exposed to severe environmental conditions such as salt, high speed of current, wave, and wind compared with other onshore structures. In spite of the importance of maintaining the structural integrity for an offshore structure, there are few cases to apply a structural health monitoring (SHM) system in practice. The impedance-based SHM is a kind of local SHM techniques and to date, numerous techniques and algorithms have been proposed for local SHM of real-scale structures. However, it still requires a significant challenge for practical applications to compensate unknown environmental effects and to extract only damage features from impedance signals. In this study, the impedance-based SHM was carried out on a 1/20-scaled model of an Uldolmok current power plant structure in Korea under changes in temperature and transverse loadings. Principal component analysis (PCA)-based approach was applied with a conventional damage index to eliminate environmental changes by removing principal components sensitive to them. Experimental results showed that the proposed approach is an effective tool for long-term SHM under significant environmental changes.
Key Words
    piezoelectric sensors; electromechanical impedance; temperature; load; structural health monitoring; principal component analysis
Jiyoung Min: Structural Engineering Research Division, SOC Research Institute, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-ro, Ilsanseo-gu, Goyang-si, Gyeonggi-do 411-712, Republic of Korea
Jin-Hak Yi: Coastal and Environmental Engineering Division, Korea Institute of Ocean Science and Technology, 787 Haean-ro, Sangnok-gu, Ansan, Gyeonggi-do 426-744, Republic of Korea
Department of Convergence Study on the Ocean Science and Technology, Korea Maritime and Ocean University, Busan, Republic of Korea
Chung-Bang Yun: School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, UNIST-gil 50, Ulsan 689-798, Republic of Korea

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