- 學位論文
無人飛機彈射架之結構最佳化研究
The Study of Optimization for Catapult Structure of UAV
摘要
近年來，無人飛機逐漸自軍事用途擴展到其他各領域，無人飛機不僅減少人力使用，亦因其制空性，充份發揮在高空中偵查、運輸等地利之便，在農業、災害勘察、搜救都有長足的進步。無人飛機亦因其用途不同，配備不同的酬載而機體大小有顯著的差異性，但除了多旋翼無人機之外，多數的無人機起飛需要較長的軌道或是使用彈射起飛， 而在彈射架本體結構中，軌道所佔之重量比最高，因此彈射架軌道輕量化結構的設計與分析就相形重要。有鑒於此，本論文研究首先以Design Expert軟體進行軌道結構之彈力繩位置、逃孔形狀及位置等模擬因子與水準的參數設計，利用3D CAD軟體繪出分析參數所需之彈射架結構，再以ANSYS Workbench之靜力分析模組進行軌道結構應力及應變分析，最後再將結果輸入Design Expert軟體進行結構最佳化設計參數的計算以及結果確認。由結果可知：(1)彈射架軌道在彈力繩位置為比例0.72逃孔形狀WH比為0.53及位置為並排時，其最大變形量0.322mm、最大應力31.75MPa，與原始設計比對得知，變形量減少了59%，應力減少了17%；(2)以Design Expert執行最佳化參數，彈力繩位置為比例0.72逃孔形狀WH比為0.53及位置為並排時，其理論最大變形量0.31mm、理論最大應力30.21MPa，將此最佳化參數進行驗證模擬，結果為變形量為0.322mm，誤差為5%，應力為31.75MPa，誤差為5%。
並列摘要
In recent years the application of unmanned aerial vehicles has gradually spread from military field to other fields. Unmanned aerial vehicles, with their advantages in aerial surveillance and transportation, can not only reduce the need for manpower but have also found extensive applications in agriculture, disaster survey, and search and rescue. For different uses, the unmanned aerial vehicles may carry different payload and have distinctly different sizes. However, with the exception of rotary wing unmanned aerial vehicles, most unmanned aerial vehicles require relatively long track or catapult. In the construction of the launch racks, the track constitutes most of the weight, it is therefore very important to investigate design and analysis for reducing the weight of the track. To that end, this paper presents a study use Design Expert where the location of the elastic catapult band of the launch track, the die opening profile and position are determined using simulation design in which software is used to draw the launch rack structure needed for the parameter analysis. This is followed by stress and strain analysis of the launch rack using ANSYS Workbench static analysis module, and finally the analysis results are fed into the software to optimize the design of the structure and to validate the results. (1) The maximum amplitude of deformation is 0.322mm and the maximum stress is 31.75MPa. Compared with the original design, the deformation is reduced by 59%, and the deformation is reduced by 59% Stress reduced by 17%. (2) The optimized parameters were calculated by Design Expert, the ratio of the elastic rope was 0.72, and the theoretical maximum deformation was 0.31mm and the theoretical maximum stress was 30.21MPa. The optimization parameters were validated. Simulation, the results for the deformation of 0.322mm, the error is 5%, the stress is 31.75MPa, the error is 5%.