Smart Structures and Systems

  • 제15권2호
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  • Pages.335-353
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  • 2015
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Issues in structural health monitoring for fixed-type offshore structures under harsh tidal environments

  • Jung, Byung-Jin (Coastal and Environmental Engineering Division, Korea Institute of Ocean Science and Technology) ;
  • Park, Jong-Woong (Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign) ;
  • Sim, Sung-Han (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology) ;
  • Yi, Jin-Hak (Coastal and Environmental Engineering Division, Korea Institute of Ocean Science and Technology)
  • 투고 : 2014.12.30
  • 심사 : 2015.01.20
  • 발행 : 2015.02.25
⟨ 이전 논문 다음 논문 ⟩

초록

Previous long-term measurements of the Uldolmok tidal current power plant showed that the structure's natural frequencies fluctuate with a constant cycle-i.e., twice a day with changes in tidal height and tidal current velocity. This study aims to improve structural health monitoring (SHM) techniques for offshore structures under a harsh tidal environment like the Uldolmok Strait. In this study, lab-scale experiments on a simplified offshore structure as a lab-scale test structure were conducted in a circulating water channel to thoroughly investigate the causes of fluctuation of the natural frequencies and to validate the displacement estimation method using multimetric data fusion. To this end, the numerical study was additionally carried out on the simplified offshore structure with damage scenarios, and the corresponding change in the natural frequency was analyzed to support the experimental results. In conclusion, (1) the damage that occurred at the foundation resulted in a more significant change in natural frequencies compared with the effect of added mass; moreover, the structural system became nonlinear when the damage was severe; (2) the proposed damage index was able to indicate an approximate level of damage and the nonlinearity of the lab-scale test structure; (3) displacement estimation using data fusion was valid compared with the reference displacement using the vision-based method.

키워드

과제정보

연구 과제번호 : Development of active-controlled tidal stream generation technology

연구 과제 주관 기관 : Ministry of Oceans and Fisheries

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