Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/1771
標題: 使用最佳化設計方法改善龍門銑床之性能
Improving Performance of a Bridge Type Machining Center Using Optimization Methods
作者: 黃建智
Huang, Jain-Jr
關鍵字: Bridge type machining center;龍門銑床;Topology optimization;Sizing optimization;拓樸最佳化;尺寸最佳化
出版社: 機械工程學系所
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摘要: 
本文以改善一現有龍門銑床的設計為主題,對機台次結構內部加強肋設計進行改善,設計目標以輕量化、高剛性為主。首先對原設計進行結構分析,了解原設計結構特性後,選定工作台、門橋、底座作為改善對象,再分別應用拓樸最佳化(Topology optimization)和尺寸最佳化(Sizing optimization)理論進行改善次結構之性能,使用的有限元素分析軟體為MSC.Nastran。
拓樸最佳化以原設計加強肋所在空間,作為設計空間,以三維元素求出結構的補強最佳的形態,尺寸最佳化則是將原設計加強肋改以板元素建構,板的厚度值作為最佳化設計對象,所得結果會是原有設計形態的最佳解。
由最佳化設計的結果,與原設計進行比較,部分次結構的靜動態性能均可提升,重量也可降低,可達成輕量化、高剛性的設計目標,整體而言拓樸最佳化的改善效果會優於僅進行尺寸最佳化的設計結果。

The purpose of this study is to improve the performance of a bridge type machining center. The changes are made up the ribs within same substructures. The objective is to increase the stiffness of the structure as well as to minimize the weight. The original design is analyzed first to understand its performance. According to the results, the working table, the bridge, and the base structures are selected to be modified. The topology and sizing optimization techniques are used to optimize the structure. MSC.Nastran is used for finite element analysis.
The design space containing the original ribs is used as the design space for topology optimization. Solid elements are created within this space and these elements will form optimum reinforced structure by using topology optimization. The sizing optimization will change the thicknesses of the original ribs to optimum values.
In comparison with the original design, the static and dynamic performance of some substructures is improved. The structural weight is also reduced. In general, if the topology optimization can be successfully applied in a design space, the solution by topology optimization will be better than that by sizing optimization.
URI: http://hdl.handle.net/11455/1771
其他識別: U0005-0104200815491900
Appears in Collections:機械工程學系所

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