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題 名 | The Curvature Function Method for Optimal Thickness Profile Design at Discontinuities of Axisymmetric Shells=以曲率函數法作軸對稱殼結構不連續點的厚度輪廓最佳化設計 |
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作 者 | 徐業良; | 書刊名 | 力學 |
卷 期 | 10:1 1994.03[民83.03] |
頁 次 | 頁11-19 |
分類號 | 446.874 |
關鍵詞 | 形態最佳化; 曲率函數法; 零次最佳化; Shape optimization; The curvature function method; Zero order optimization; |
語 文 | 英文(English) |
中文摘要 | 殼結構不連續點造成應力集中。本文發展了一個軸對稱殼結構厚度最佳化設計程 序, 可找出將應力集中降至容許限度的最小重量厚度輪廓。 這個程序結合了曲率函數法與 FAST1 殼分析程式,以厚度輪廓之曲率為設計變數,而這是一個零次最佳化方法,只須要應 力值,不需要應力梯度,且其所得的厚度曲線有 C �斑s續性。 此法適用於任何結構分析程 式,但 FAST1 可以少數大殼元素模擬複雜殼結構,因此模型準備及計算時間都大幅降低。 |
英文摘要 | Discontinuities in a shell structure cause stress concentration. An axisymmetric shell thickness optimization procedure is developed in this study to find the minimum weight thickness profile which reduces the stress concentration to an allowable value. In this procedure, the Curvature Function Method has been coupled with the FAST1 shell analysis program. This method employs curvatures of the thickness profile as design variables. It is a zero order optimization method which requires only stress values along the shell, not gradient of the stresses with respect to the design variables, in addition, the resulting thickness curve has C �� continuity. Though the method is independent of structural analysis program, FAST1 provides a particular advantage since it permits the user to model complex shells with only a few large shell elements and still retain a sufficiently accurate solution. Thus both preparation and computation time are substantially reduced. Various shell models with different types of discontinuities have been optimized by this procedure. |
本系統中英文摘要資訊取自各篇刊載內容。