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

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 25; no. 4; pp. 59 - 65
• Main Authors: 민지영(Jiyoung Min), 심효진(Hyojin Shim), 윤정방(Chung-Bang Yun), 이진학(Jin-Hak Yi)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 2011
• Subjects: 해양공학; Long-term structural health monitoring 장기 구조물 건전성 모니터링; Principal component analysis 주성분 분석; Piezoelectric sensors 압전센서; Noisy environment 잡음 환경; Electro-mechanical impedance 전기-역학적 임피던스; -
• ISSN: 1225-0767; 2287-6715

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.