다양한 조류 환경 및 경계 조건에 따른 모노파일형 해상구조물의 동특성 변화 분석 KCI

Title
다양한 조류 환경 및 경계 조건에 따른 모노파일형 해상구조물의 동특성 변화 분석
Alternative Title
Changes in Dynamic Characteristics of Monopile-Type Offshore Structures According to Tidal Environments and Boundary Conditions
Author(s)
정병진; 박종웅; 이진학; 박진순
KIOST Author(s)
Yi, Jin Hak(이진학)
Publication Year
2014-08
Abstract
Because a change in the natural frequencies of a structure indicates structural health problems, monitoring the natural frequencies crucial. Long-term measurement for the Uldolmok tidal current power plant structure has shown that its natural frequencies fluctuate with a constant cycle twice a day. In this study, lab-scale tests to investigate the causes of these natural frequency fluctuations were carried out in a circulating water channel. Three independent variables in the tests that could affect the fluctuation of the natural frequencies were the water level, current velocity, and boundary condition between the specimen and the bottom of the circulating water channel. The experimental results were verified with numerical ones using ABAQUS. It was found that the fluctuation of the natural frequencies was governed by a decrease in stiffness due to the boundary condition much more than the effect of added mass. In addition, it was found that the natural frequency would decrease with an increase in the tidal current velocity because of its nonlinearity when the boundary condition was severely deteriorated due to damage.
ISSN
1225-0767
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2760
Bibliographic Citation
한국해양공학회지, v.28, no.4, pp.261 - 267, 2014
Publisher
한국해양공학회
Keywords
Natural frequency; Added mass; Monopile-type offshore structures; Tidal effects; Circulating water channel; Boundary condition; 고유주파수; 부가질량; 모노파일형 해상구조물; 조류영향; 회류수조; 경계조건
Type
Article
Language
Korean
Publisher
한국해양공학회
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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