本文主要目的為模擬風帆輔助之船舶航行於不同海況中之運動情況，並考量風帆船舶航行之安全性，同時評估加入風帆後，船舶節能之效果。
本文以船體六度運動方程式為基礎，計算風帆受力後加入運動方程式內，運用四階Runge-Kutta之數值方法求解時程領域下船舶之運動反應，並加入最佳操帆控制來達到風帆節能效果；為使風帆助航發揮最大效能，須具備一有效率之帆角控制，本文考慮船舶於自動操控時，真實船向與目標航向並不會永遠一致，因此，風帆受風力分量則以指向目標航向上為主；風帆最佳攻角之選取法採比較選取，運用風帆空氣動力性能曲線計算風帆全部攻角所能產生之升阻力，並選出使船舶於航行所能得到最大推力之最佳攻角，藉此換算出實際轉帆角，提供操帆之參考。
文中由所設定之目標點控制航向並模擬不同海況下之船舶運動反應，分析其航行時間多寡，利於評估風帆船舶於何風向角下之助益較大；並延伸應用於真實航線下(台灣-基隆港至日本-長崎港)之模擬，模擬航行時所採用之風浪狀況為美國國家海洋及大氣資料管理局NOAA(National Oceanic And Atmospheric Administration )之全球海氣象資料，最終進行整體航程省油及減碳排放量之評估。
根據本文模擬結果顯示，於正逆風情況下，因採風浪同向，船舶除了受風阻外，仍受波浪阻力影響，導致船舶速度增加率較差；側風情況，因加入風帆可利用側向來風，將風阻化為推力，進而提供船舶部分動力達到節能效果；順風情況，雖順浪能有效地幫助船舶前進，但因此處相對風速較小，使船舶增加率較側風情況差；綜合以上結果，模擬船舶於真實航線下，加入風帆之船舶能有效地幫助航行時之節能省油，達到經濟及環保之效益。

The main purpose of the present study is to establish the motion simulation model for a sail-assisted ship in the seaway, which also includes the considerations of the safety and energy saving of the ship.
The study based on the six degrees of freedom motions of ship in waves, and then adds the sail force due to the wind sails on board installed. The time domain simulation’s calculation for ship motions in the seaway is treated by the fourth order Runge-Kutta method. To attain the optimal energy saving of the ship, it is necessary to control the angle of sail based on the aerodynamic characteristics curve of sail. Based on the set waypoints, we can control the ship to navigate the desired course in different sea states and judge if the benefits of the sail-assisted ship can get by analyzing the sailing time. Further, we also simulate the real navigation from Keelung port to Nagasaki Port to verify the advantage of the sail-assisted ship in seaway.
According to the results, the ship navigates in head wind will cause the less speed due to wind resistance and wave resistance. It also reveals that sails are able to get the optimal turning angle transforming the wind resistance into thrust in lateral wind. Finally, although the following wind may help the ship to advance faster, the suitable enough relative velocity is the significant factor on the thrust in downwind. Therefore, rate of speed change of downwind is not necessarily larger than that in lateral wind. In summary, sail-assisted ship can achieve economic and ecofriendly benefit.

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