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操控運動情況，並評估其節能效果。以船體六度運動方程式為基礎加入風帆受力，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；本文考慮船舶於自動操控時，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攻角，換算出實際最佳轉帆角，提供風帆助航最大效能之操帆參考。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，以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，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，加入風帆之船舶確實能有效地幫助航行之節能省油，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 includes the considerations of the 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 installed on board. 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, the present study is 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 the seaway. In summary, the present results show that the sail-assisted ship can indeed achieve economic and ecofriendly benefit.