本論文之主要目標為小型風機系統之結構分析與設計改善。研究方法為使用有限元素軟體ANSYS模擬小型垂直軸10kW風力發電機，分別對塔架為6公尺高及9公尺高之風機系統，進行靜態結構分析，以考慮風機在最大轉速與極端風速時的應力分佈及安全係數，且再進行動態自然頻率分析，以考慮是否會有共振的狀況。由於風機整體之幾何較複雜且體積較大，網格過多不易收斂，故再提出以進行風機次系統分析以預測主系統之靜態及動態特性，經驗證後亦證明此方法的可行性。最後則提出對風機系統結構之改善建議，塔架區結構之有效改善方法為底部塔架改為錐狀，以及於塔架上半區域加鋼繩，而葉片區有效之改善方法為副葉片強度減弱，及葉片區連桿加強，連桿加強也能使葉片區避開可能造成共振之連桿彎矩模態。本文所提出之數值結果與改善建議能提供給小型風機製造業者往後設計系統時之參考。 The main objective is to improve the structural analysis and design for small wind turbine system. The 10-kW wind turbine is investigated by using a finite element software - ANSYS. It analyzes the static structural of the wind turbine in the maximum rotational speed and the extreme wind speeds. Besides, it analyzes the dynamic natural frequency to consider whether it closes to the natural frequency of the structural system resulting in resonant amplification. When the overall wind turbine is complex and large, its mesh is hard to converge. Therefore, it predicts the static and dynamic properties of the main system by subsystem analyzing. It's workable after proving subsystem analyzing. Finally, there are some proposed structures for the wind turbine improvement. For the tower of the wind turbine, its workable methods to change tubular tower into cone and add steel cables. For the part of the blades, to add stiffness of connecting rods and weaken secondary blades is workable methods. Besides, adding stiffness of connecting rods can avoid the natural frequency of the structure. Furthermore, the result and improvement can provide reference for a designer of the small wind turbine.
