流體力學上，仿生推進是被重視的。本文主要是探討有關仿生推進在船隻上可能的應用。故研究仿魚鰭的推進方式，主要針對魚尾鰭的幾何形狀的變化，對魚尾鰭推力分布趨勢大小的影響。
本實驗自行定義出二維三角幾何魚鰭系統，根據幾何的變化，比較魚鰭的推力趨勢，使用NBR 耐油橡膠作為魚鰭的材料，設計一擺動推進系統使魚鰭以正弦波的方式擺動，再以應變規量測系統測量魚鰭推力之時間變化。在實驗項目裡，主要研究三種魚鰭幾何形狀在不同振幅及不同擺角下的推進特性。同時利用流場可視化的技術來分析魚鰭作動方式。由實驗結果可得在單位面積下，魚鰭的幾何形狀以類似旗魚的尖銳型二叉尾推力最大，且在不同場合時，不同的魚鰭推力表現均會不同。魚鰭在擺動的運動方式中，平移方向的推力的重要性會比旋轉方向來的大；由可視化分析中可相互比較擺動速度、位移與魚鰭推力的時間變化，魚鰭的主要推力變化來自於擺動的運動模式；FFT的分析可確認魚尾鰭所產生的最大力量之頻率為擺動週期的兩倍。

In the field of fluid mechanics, bio-inspired propulsion is important.The main purpose of this thesis is to investigate the possible application of bio-inspired propulsion in ships. Therefore, we study the propulsion
method of bio-inspired fin by investigating the effect of the changes of geometry of fin to thrust trend.
In our experiment, we define thin-triangle fin system. According to the changes of geometry, we compare the thrust trend of fin by using NBR rubber as the material of fin. We design one oscillation propulsion system that makes the fins oscillating in the sine wave form, and then
measure fin thrust trend by strain gages measure system. As for the items of our experiment, we investigate the relationship of three types of fin geometry in condition of the same oscillate angles and different amplitude and in condition of the same amplitude and different angles.Meanwhile we use flow visualization to analyze the working mechanism of fin. In the oscillation method of fin, the importance of sway is greater than that of yaw. In the analysis of flow visualization, we can compare the trends of oscillation velocity, position, and fin thrust. We argue that the main thrust trend of fin comes from the oscillation of model. The analysis of FFT can help us confirm that the frequeucy of the maximum power of fin is the twice of swinging period.

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