離岸風機要達成20年設計壽命，首先須對環境外力進行詳細評估。本研究重點分三部分，第一部分離岸風機環境載重模組開發，參考IEC 61400-1、IEC 61400-3、DNV-RP-C205、分別撰寫風場模型、波浪模型，海流模型。氣動力負載部分，使用美國再生能源實驗室開發之Turbsim程式模擬紊流風場，以及FAST程式計算風機上部結構風力負載；水動力負載部分，使用流函數模型(Stream function wave theory)及二階動態模型(Second-order kinematics model)，分別模擬規則波與不規則波波浪質點運動特性，並與海流疊加，最後代入莫里森方程式(Morison’s equation)求得波流負載。第二部分說明相關輔助程式輸入檔之整合，整合之共用輸入檔加入複製功能、迴圈功能、列舉功能，快速完成設計載重組合之建立，並使用平行化處理技巧提升計算效率。第三部分為說明共用輸入檔中，有限元素數值模型建立方式及設計載重組合設定方式，分別參考NREL 5MW參考風機模型及IEC 61400-3設計載重組合。本研究完成1326個載重組合之分析與設計，使用多機平行化處理技巧確實能縮短分析時間之目的。電腦輔助分析程式由 朱聖浩教授研究團隊所開發，分析程式與研究成果皆為公開資源。

For at least 20-year design lifetime, it is necessary to assess the environmental loads first. This thesis is divided into three parts. The first part deals with the development of environmental load module including wind models, wave models, and current models on the basis of IEC61400-1, IEC61400-3, and DNV-RP-C205. For aerodynamic loads, the Turbsim program developed by National Renewable Energy Laboratory (NREL) was employed to simulate turbulent inflow, and the FAST program was used to calculate wind loads acting on the rotor-nacelle assembly. For hydrodynamic loads, the Stream function wave theory and the Second-order kinematics model were used to simulate wave kinematics in regular waves and irregular waves respectively. After the superposition of wave velocities and current velocities, the hydrodynamic loads acting on the support structure were obtained by using the Morison’s equation. The second part describes integration of the input files from related computer aided programs. The functions of copying, looping, and listing were added to the common input file for generating design load cases rapidly, and the parallel processing techniques were used to enhance calculation efficiency. The third part introduces the parameter setting in the common input file for establishing a finite element model and design load cases according to NREL 5-MW reference wind turbine and IEC 61400-3 standard. Note that the computer programs developed by the research team of Shen-Haw Ju are open and free to use.

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