葉片內部的翼樑由於製程複雜，往往造成生產成本上的負擔。本論文即針對翼樑的部份，討論翼樑的有無，對葉片在承受相同負載下，各式力學行為的影響並做分析比較。不過顯然的，無翼樑的葉片勢必較有翼樑的葉片脆弱，如此直接比較結果並無意義。為了讓比較具有意義，我們也提出了一種方法，使得有、無翼樑的葉片能夠在相同強度的基準上做比較。另外也針對分析結果對葉片表層複材的纖維排列，做最佳化設計。最後，再將設計出來的葉片各葉素之初始厚度推算出相映的纖維層數，不過為了配合製造上的需要及限制，層數必須為整數，因此取最接近之整數為實際纖維層數，再以此層數回推出最終實際厚度，進而完成一風力發電機葉片之設計及製造的流程。

The manufacturing process of the spar in a wind turbine blade structure is complicated, resulting in significant cost increment. Therefore, the goal of this study is to analyze the effects of the spar on mechanical behaviors of a blade during the various loading tests. Analyses of the wind turbine blade with or without spar structures are performed under various loading conditions. Notice that it is improper to compare these two structures directly under the same loading condition. The corresponding skin thicknesses for the two designs are determined under the same strength in applying the failure criteria. In addition, we use the analytic results to optimize the fiber arrangement design on the skin of the blade. Finally, the layer number of each blade element is estimated to satisfy the requirement and limitation of manufacturing that the layer number must be an integer.

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