尋找一個乾淨的替代能源是現今社會的主要議題，而浮式離岸風機(FOWTs)正是目前熱門的主要研究項目之一。不同於固定式基礎離岸風機，FOWTs能夠提供在深海地區捕捉風能的一個潛在可能，然而因為技術上的限制，FOWTs在極端環境下的分析與設計尚未成熟。本研究使用使用朱聖浩教授團隊所開發的軟體對FOWTs進行分析與設計，並遵循著國際電工委員會所提出之建議分析，包括IEC 61400-3-1 [1] 和 IEC TS 61400-3-2 [2]，且依照美國石油學會API與Det Norske Veritas所提出的設計準則進行設計[3] [4]。為了符合FOWTs大位移的事實，使用了Rodrigues三維旋轉方程式，提出了一種大變位的有限元素分析法(FEM)，使得元素的局部座標軸可以隨著桿件的大變位所移動。所提出的方法經過與商業軟體Abaqus及文獻的驗證，證明了方法的可靠性。FOWTs的行為以及設計深受水動力所影響。此外，繫泊系統的高度非線性剛度及複雜性，使得FOWTs的分析與設計更加困難。為了使FOWTs能夠在嚴厲的海洋環境中生存，提出了一種繫泊線控制系統的初步研究。透過放線與收線的方式，避免繫泊線的拉緊與過短。分析軟體的繫泊線模型使用了一個浮力系統驗證了程式的正確性。結果顯示，所提出的方法能夠有效避免繫泊線的尖峰張力，進而避免繫泊系統的破壞。由於繫泊線的張力減少，繫泊線傳遞給平台的張力也同時降低，因此即使在極端的海洋環境之中，FOWTs仍可以成功的被設計出來，且不需要過大的材料厚度。此外，越大的浪擁有越大的週期，也就是更低的頻率。然而，透過繫泊線控制系統的加入，能夠降低FOWTs之自然頻率，有效的避免與極端的波浪外力產生之共振效應。
本研究所使用的分析方法及設計程式由朱聖浩教授研究團隊共同開發，程式及研究成果皆為公開資源，朱聖浩教授與本文作者雙方均可獨立發表論文。

Finding clean alternative energy sources is a major issue nowadays, and Floating Offshore Wind Turbines (FOWTs) are one of the famous research topics. However, due to technical limitations, the analysis and design of FOWTs in extreme environments are not yet mature. This research uses software developed by Professor Shen-Haw Ju's team to analyze and design FOWTs, following the recommendations of the IEC 61400-3-1 [1] and IEC TS 61400-3-2 [2], and adhering to design guidelines proposed by the API [3] and DNV [4].To account for the large displacements of FOWTs, Rodrigues' 3D rotation formula was used to propose a finite element method (FEM) for large displacement analysis, allowing the local coordinate axes of elements to move with the large displacements of the member. The proposed method was validated against commercial software Abaqus and literature, demonstrating its reliability. The behavior and design of FOWTs are heavily influenced by hydrodynamic forces. Furthermore, the high nonlinear stiffness and complexity of the mooring system make the analysis and design of FOWTs even more challenging. To enable FOWTs to survive in harsh marine environments, a preliminary study of a mooring line control system was proposed. By extending and retracting the mooring lines, the control system prevents the lines from becoming too tight or too short. The mooring line model of the analysis software was validated using a buoyancy system, demonstrating the accuracy of the program. The results show that the proposed method effectively avoids peak tension in the mooring lines, thereby preventing mooring system failure. With reduced tension in the mooring lines, the tension transmitted to the platform is also reduced, allowing FOWTs to be successfully designed even in extreme marine environments without requiring excessive member thickness. Moreover, larger waves have longer periods, resulting in lower wave frequencies. However, with the addition of the control system, the natural frequency of the FOWTs can be reduced, effectively avoiding resonance with large waves.
The analysis method and design program used in this study were developed by Professor Shen-Haw Ju's research team. The program and research results are publicly available resources. Both the Professor and author of this research can publish papers independently.

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