目前水下載具的研究現況都朝尺寸小且具有海底影像偵測和管路探測等功能邁進。本研究主要是發展微小水下載具，著重在探討微小水下載具製作的可行性及載具的系統整合，包括馬達挑選、螺槳的設計、製作和推力測試、腔體設計與製作、載體組裝。首先為了使微小螺槳特徵顯著，及腔體流線外型可順利製作出來，考慮到材料和製程的配合，從非傳統加工法和材料特性中選出最合適的SDM（Shape Deposition Manufacturing）製程。
挑選適合馬達尺寸與性能，並設計腔體大小，接著依據軸流風扇設計概念，配合NACA的葉形，產生出所須螺槳。運用CAD/CAM軟體實行模型設計、製程規劃與刀具路徑模擬，以聚合材料和三軸CNC加工機配合的SDM製程將螺槳和腔體製作出來。因為螺槳和中間圓柱的黏結面積最大僅有0.9㎜，經測試在切削路徑選擇「螺旋式」，可減少切削力集中導致螺槳斷裂的問題。
將螺槳搭載於馬達後，利用虎克定律F=kx，載具於轉速1500 rpm時，由彈簧拉伸的距離計算出推力。與數值模擬軟體得到的理論推力，其誤差值為2.8﹪，可作為未來螺槳設計或製程改進的重點；將載具組裝完成後，調整腔體重量使之可平順前進，並依據載具在水中的運動情況，討論設計改善的重點。

Presently, the state of research of underwater vehicle is striding forward to small size and with functions of underwater image detection and piping probe. This study focuses mainly on developing the meso-scale underwater vehicle and exploring the practicability of manufacturing meso-scale underwater vehicle and integrating systems of vehicle, including motor selection, propeller design, manufacturing and thrust testing, hull design and manufacturing, and last carrier fabrication. In order to highlight the feature of the meso propellers, successfully manufacture the streamlined hull, and take both material and process into consideration, this study chooses the most suitable process, SDM（Shape Deposition Manufacturing）, based on nontraditional machining and material qualities.
First of all, this study chooses the appropriate size and properties for the motor, and then designs the hull. The propeller for the meso-scale underwater vehicle is designed based on the theory of axial-flow fan and with the aids of NACA airfoil. Besides, CAD/CAM software is applied to carry out the model constructing, the process planning and the tool path simulation. Regarding the propeller and hull manufacture, SDM process is utilized of polymer material and three axis CNC machine. The maximum of contact area between the airfoil and the hub is 0.9㎜, this causes the problem that the concentration of the cutting force results in the break in the airfoil. After testing, this problem can be solved by selecting spiral pattern in the menu of cutting path.
After installing the propeller on the motor, the thrust can be calculated with the Hooke’s law（F=kx）based on the stretch distance of the spring pulled by the vehicle at the rotation rate of 1500 rpm. The value difference 2.8﹪derived from the numerical simulation software can be seen as the focus for future propeller design or process improvement. Moreover, this study also suggests that after assembling the vehicle, adjusting weight can make the vehicle operate more smoothly; and improving the design based on the underwater operation condition of the vehicle is necessary.

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