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研究生： 卓育丞
Cho, Yu-Cheng
論文名稱： 離岸風機塔架之疲勞和極限分析與設計
Ultimate and Fatigue Analyses and Designs of Offshore Wind Turbine Towers
指導教授： 朱聖浩
Ju, Shen-Haw
學位類別： 碩士
Master
系所名稱： 工學院 - 土木工程學系
Department of Civil Engineering
論文出版年： 2021
畢業學年度： 109
語文別： 英文
論文頁數： 107
中文關鍵詞： 套管式離岸風機 、應力集中係數 、疲勞分析與設計 、離岸變電站
外文關鍵詞： Jacket-type offshore wind turbine, Stress concentration factor, Fatigue analysis and design, Offshore substation
相關次數： 點閱：121  下載：50 
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    • 台灣有著相當適合發展離岸風電的風場，因此在過去幾年離岸風電成為了大力推廣的再生能源，也進行了許多相關的研究。然而，這些研究大多是針對套管式離岸風機塔架結構在極限荷載下的設計與分析，因此，本研究將著重於在疲勞荷載下的分析與設計，並研究應力集中效應對於疲勞壽命的影響。本研究首先對鋼結構設計程式進行了更新和補充，主要是依照API RP 2A-LRFD (2019)鋼結構設計規範編寫，而對於不在規範內的大管厚比之桿件，則是依照DNV-RP-C202之規範設計。接著列出並介紹了各種會造成應力集中的情況，包含管件焊接處或是漸變段。評估各種情況所造成之應力集中係數後，將此係數乘上應力形成新的等效應力，再透過雨流計數法配合S-N curve與Miner’s rule完成疲勞分析進而得出疲勞損傷。最後由分析結果提出了幾項設計上的參考建議。除此之外，隨著離岸風電的發展，對於離岸變電站的需求也逐漸出現，對此，本論文提供了關於離岸變電站的初步研究，主要是離岸變電站所受到的正向風力與側向風力。本論文中電腦輔助程式皆由朱聖浩教授團隊所研發，且分析程式與研究結果皆為公開資源。

    Taiwan has a perfect wind field to develop offshore wind power. As a consequence, offshore wind power became a widely promoted renewable energy in the past few years and many related studies have been done. However, most of these studies were only mainly focused on the ultimate load analysis and design of the jacket-type offshore wind turbine structure. Thus, in this study, it will mainly focus on the fatigue load analysis and design and look up the relationship between the stress concentration and fatigue life. In this thesis, the steel design program is updated and added some supplement first. The program is mainly written in accordance with the API RP 2A-LRFD steel structure design specification. As for the steel members with large diameter to thickness ratio that does not contain in API specification, it takes the DNV-RP-C202 standard as reference. Then provides various stress concentration conditions according to DNVGL-RP-C203, including welding and tubular difference. After calculating the stress concentration factor (SCF) of each condition, these SCFs were put into the fatigue analysis of the jacket-type support structure. The stress times SCFs to become a new equivalent stress before performing Rainflow counting, S-N curve, Miner’s rule to calculate the fatigue damage. Some useful conclusions can be made through the analysis results. Additionally, with the growth of offshore wind power, the demand of offshore substations (OSS) gradually emerged. Thus, this thesis provides primary studies of OSS. Mainly on how to evaluate the wind force of OSS, including along wind and across wind. Note the computer programs in this thesis are developed by Juju’s team, and they are open and free to use.

    摘要 I Abstract II Acknowledgement III Contents IV List of Tables VII List of Figures VIII Chapter 1 Introduction 1 1.1 Background and Purpose 1 1.2 Literature Review 2 1.2.1 Study on Offshore Wind Turbine’s material 2 1.2.2 Study on Offshore Wind Turbine’s fatigue 3 1.2.3 Study on Offshore Wind Turbine’s design 4 1.2.4 Study on Offshore Substation 5 1.3 Overview 6 Chapter 2 Steel Design Analysis 7 2.1 API standard 7 2.2 Supplement Specification 9 2.2.1 Stresses in Cylindrical Shells 9 2.2.2 Buckling Resistance of Cylindrical Shells 12 2.3 Validation of The Steel Design Program 18 2.3.1 Introduction of the program 18 2.3.2 Comparison of the program 23 Chapter 3 Fatigue Analysis and Design 35 3.1 Stress Concentration Factor (SCF) 35 3.1.1 SCF formulas for butt welds between same thickness tubulars 35 3.1.2 SCF formulas for butt welds at different thickness tubulars 36 3.1.3 SCF formulas for interaction between tolerance and thickness transition 42 3.1.4 Sum up of the SCF at thickness transition and butt weld 43 3.2 Flow of Fatigue Analysis 44 3.3 Program Integration 47 3.3.1 Program Outline 47 3.3.2 Structure Model Introduction 51 3.3.3 Output of the Program 53 Chapter 4 Case Study and Result Discussion 57 4.1 Case Model Introduction 57 4.2 Design Load Cases 60 4.3 Flow of the Operation 63 4.4 Results and Discussions 64 Chapter 5 Primary Study on Offshore Substation 69 5.1 Overview of Standards related to Load Combination 70 5.2 Wind Loads on Offshore Substation 74 5.3 Basic Model and Case Study 83 Chapter 6 Conclusions 87 6.1 Conclusions 87 6.2 Future works 88 References 90 Appendix A 92 Appendix B 100

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