Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Impedance-based Long-term Structural Health Monitoring for Tidal Current Power Plant Structure in Noisy Environments

잡음 환경 하에서의 전기-역학적 임피던스 기반 조류발전 구조물의 장기 건전성 모니터링

  • 민지영 (한국과학기술원 건설 및 환경공학과) ;
  • 심효진 (한국과학기술원 건설 및 환경공학과) ;
  • 윤정방 (한국과학기술원 건설 및 환경공학과) ;
  • 이진학 (한국해양연구원 연안개발에너지연구부)
  • Received : 2011.12.03
  • Accepted : 2011.08.16
  • Published : 2011.08.31
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Abstract

In structural health monitoring (SHM) using electro-mechanical impedance signatures, it is a critical issue for extremely large structures to extract the best damage diagnosis results, while minimizing unknown environmental effects, including temperature, humidity, and acoustic vibration. If the impedance signatures fluctuate because of these factors, these fluctuations should be eliminated because they might hide the characteristics of the host structural damages. This paper presents a long-term SHM technique under an unknown noisy environment for tidal current power plant structures. The obtained impedance signatures contained significant variations during the measurements, especially in the audio frequency range. To eliminate these variations, a continuous principal component analysis was applied, and the results were compared with the conventional approach using the RMSD (Root Mean Square Deviation) and CC (Cross-correlation Coefficient) damage indices. Finally, it was found that this approach could be effectively used for long-term SHM in noisy environments.

Keywords

Acknowledgement

Grant : 조류 에너지 실용화 기술개발

Supported by : 국토해양부 R&D사업

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