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5MW급 해상풍력발전시스템용 Suction Caisson 하부구조물 적합성 연구

김용천 (Yong-chun Kim)

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초록 moremore
Foundation plays an important role in the offshore wind turbine system. Different from conventional foundations, the suction caisson is proven to be economical and reliable. In this work, three-dimensional finite element method is used to check the suitability of suction caisson foundation. NREL 5MW wind turbine is chosen as a baseline model in the simulation. The maximum overturning moment and vertical load at the mudline are calculated using FAST and Bladed. Meanwhile the soil-structure interaction response from our simulation is also compared with the experiment data from Oxford university. The design parameter such as caisson length, diameter of skirt and spacing of multipod are investigated. Accordingly, based on these parameters, suggestions are given to use suction caisson foundations more efficiently.
Foundation plays an important role in the offshore wind turbine system. Different from conventional foundations, the suction caisson is proven to be economical and reliable. In this work, three-dimensional finite element method is used to check the suitability of suction caisson foundation. NREL 5MW wind turbine is chosen as a baseline model in the simulation. The maximum overturning moment and vertical load at the mudline are calculated using FAST and Bladed. Meanwhile the soil-structure interaction response from our simulation is also compared with the experiment data from Oxford university. The design parameter such as caisson length, diameter of skirt and spacing of multipod are investigated. Accordingly, based on these parameters, suggestions are given to use suction caisson foundations more efficiently.
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Abstract i
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Abstract i
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I. 서론 1
1.1 해상풍력발전시스템용 하부구조물 1
1.2 Suction caisson 기초구조물 2
1.3 본 연구 목적 4
1.4 연구 개요 6

II. 하중 계산 10
2.1 풍력발전기 제원 및 사양 10
2.2 외부 환경 하중 11
2.2.1 바람에 의한 하중 11
2.2.2 파도에 의한 하중 12
2.3 하중계산을 위한 시뮬레이터 13
2.3.1 FAST 하중계산 14
2.3.2 GH-Bladed 하중계산 15
2.4 하중 계산 결과 16

III. FEM 시뮬레이션 27
3.1 토양-구조물 상호작용 27
3.2 축소 모델 29
3.3 변수 변화를 통한 시뮬레이션 31
3.3.1 Skirt 반경의 변화에 따른 FEM 시뮬레이션 32
3.3.2 Skirt 길이의 변화에 따른 FEM 시뮬레이션 32
3.3.3 Tripod suction caisson 시뮬레이션 33
IV. 결과 40
4.1 Skirt 반경의 변화에 따른 시뮬레이션 40
4.2 Skirt 길이의 변화에 따른 시뮬레이션 41
4.3 Tripod suction caisson에 대한 시뮬레이션 42
4.4 반복하중에 따른 caisson 거동 특성 43

V. 결론 53

Reference 55
감사의 글 59
이력서 60
학력 60
Publications 61