Smart Structures and Systems

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Electromechanical impedance-based long-term SHM for jacket-type tidal current power plant structure

  • Min, Jiyoung (Structural Engineering Research Division, SOC Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Yi, Jin-Hak (Coastal and Environmental Engineering Division, Korea Institute of Ocean Science and Technology) ;
  • Yun, Chung-Bang (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology)
  • Received : 2014.05.01
  • Accepted : 2014.11.18
  • Published : 2015.02.25
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Abstract

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.

Keywords

Acknowledgement

Grant : Development of active-controlled tidal stream generation technology

Supported by : Ministry of Oceans and Fisheries, KIOST

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