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陸上 風力基礎 缺陷原因 및 共振分析

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Author(s)
이충기
Issued Date
2015
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000007184
Abstract
The causes of damage to the connection of the tower and the foundation of a wind turbine were investigated through literature search. In addition, two types of damaged foundation and one type of repaired foundation models were analyzed to provide a good solution to the damage in this thesis.
There are two connection types to link the wind turbine tower to the foundation: a anchored type and anchor bolt type. Based on literature search, anchored type may lead to formation with voids between concrete and anchoring flange due to continuous wind turbine vibrations. As for the anchor bolt type, turbine dynamic loads may cause the cracking of mortar grout between the tower bottom flange and concrete foundation. However, damages of anchor bolt type connection occurred less than those of anchored type. Even if the damages occur, those could be repaired easily by means of replacing damaged grout. It is recommended that the anchor bolt type should be applied for linking tower and foundation of a wind turbine.
Using Abaqus software application, initial damage model, developed damage model and repaired model for the foundation and the tower of Vestas V90-3MW were analyzed for checking resonance. Eigenvalue analysis was performed, and the results showed that initial damage model and developed damage model approached to rotor resonance frequency bandwidth, lowering tower frequency up to 9.55%. On the other hand, repaired model approached to higher frequency up to 11.23% to avoid rotor resonance bandwidth compared with the developed damage model, recovering the damaged lowered frequency. Therefore, repaired model proposed in this thesis may be a good solution to the damage of foundation connection of a wind turbine.
Alternative Title
The cause of damage to onshore wind turbine foundation and the resonance analysis
Department
산업대학원 풍력공학과
Awarded Date
2015. 8
Table Of Contents
Ⅰ. 서 론 1
1. 연구 배경 2
2. 연구 목적 2
3. 논문의 구성 3

Ⅱ. 육상풍력발전기 기초 4
1. 육상풍력발전기 기초 4
2. 육상풍력발전기 타워 5
1) Soft 및 Stiff 타워구조 5
2) 타워설계의 동역학적인 개념 6
3. 기초와 타워 접합부 7
1) 접합부 형식 분류 7
2) 앵커링 형식 접합부 9
3) 앵커볼트 형식 접합부 11

Ⅲ. 육상 풍력기초 결함사례 및 원인분석 12
1. 유럽 육상풍력 기초 결함 12
1) 개 요 12
2) 앵커볼트 형식 12
3) 단일플랜지 앵커링 형식 13
4) 이중플랜지 앵커링 형식 15

2. 일본 육상 풍력기초 결함 18
1) 개 요 18
2) 단일플랜지 앵커링 형식 18
3. 국내 육상 풍력기초 결함 21
1) 단일플랜지 앵커링 형식 21
2) 설계적인 문제 원인분석 22
3) 시공적인 문제 원인분석 25

Ⅳ. 육상 풍력기초 결함 및 보강에 따른 공진분석 26
1. 기초 결함에 따른 공진분석 26
1) 초기결함 모델에 따른 타워주파수 해석 26
(1) 개 요 26
(2) 풍력발전기 제원 26
(3) 초기결함 모델링 28
(4) 초기결함 모델 해석결과 30
(5) 초기결함 모델에 따른 공진분석 32
2) 결함진행 모델에 따른 공진분석 34
(1) 결함진행 모델링 34
(2) 결함진행 모델 해석결과 35
(3) 결함진행 모델에 따른 공진분석 36

2. 기초 보수보강 방법 및 보강에 따른 공진분석 37
1) 현 기초 보수보강 방법 37
(1) 그라우트 주입 보수법 38
(2) 상부플랜지 보강법 38
2) 앵커볼트 접합부형식 변경 보강방법 39
3) 앵커볼트 접합부형식 변경 보강방법에 따른 공진분석 42

3. 기초 결함 및 보강에 따른 공진분석 결과 43
1) 개 요 43
2) 각 Case 별 주파수 변화에 따른 공진분석 44

Ⅴ. 결 론 46
참고문헌 47
Degree
Master
Publisher
제주대학교 산업대학원
Citation
이충기. (2015). 陸上 風力基礎 缺陷原因 및 共振分析
Type
Dissertation
Appears in Collections:
Graduate School of Industry > Wind Energy Engineering
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