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

Cited 2 time in WEB OF SCIENCE Cited 3 time in Scopus
Title
Issues in structural health monitoring for fixed-type offshore structures under harsh tidal environments
Author(s)
Jung, Byung-Jin; Park, Jong-Woong; Sim, Sung-Han; Yi, Jin-Hak
KIOST Author(s)
Yi, Jin Hak(이진학)
Publication Year
2015-02
Abstract
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.
ISSN
1738-1584
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2545
DOI
10.12989/sss.2015.15.2.335
Bibliographic Citation
SMART STRUCTURES AND SYSTEMS, v.15, no.2, pp.335 - 353, 2015
Publisher
TECHNO-PRESS
Subject
MODAL IDENTIFICATION; DAMAGE; ACCELERATION; FREQUENCY; SYSTEM; MODEL
Keywords
structural health monitoring (SHM); added mass; nonlinearity; damage detection; displacement estimation; tidal current power plant structure
Type
Article
Language
English
Document Type
Article
Publisher
TECHNO-PRESS
Related Researcher
Research Interests

Ocean Energy-Tidal Current Energy Converter System,Infrastructure Management-Structural Health Monitoring,Offshore Wind,해양에너지-조류발전시스템,시설물 유지관리-구조건전성 평가,해상풍력

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