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題名 | The Efficiency of a New Vector form of Finite Element and its Application to Offshore Structures=向量式有限元素法有效應用於海洋結構物 |
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作者姓名(中文) | 張博彥; 曾國瑋; 李賢華; 鍾沛穎; | 書刊名 | 海洋工程學刊 |
卷期 | 10:1 2010.06[民99.06] |
頁次 | 頁25-47 |
分類號 | 443 |
關鍵詞 | 平面剛架元素; 向量式有限元素法; 共轉座標; 海洋結構物; Plane frame element; Vector form intrinsic finite element; Co-rotational coordinate; Offshore structures; |
語文 | 英文(English) |
中文摘要 | 本研究爲以平面剛架元素搭配向量式有限元素法(VFIFE),應用於波浪力作用下之海域平台動力分析之研究。在本研究中計算每一時間間隔之結構系統的幾何位置改變,係採用移動構架座標近似法,分析時可避免進行反矩陣之計算,以縮短動力分析時所需耗費之計算時間。由於向量式有限元素法數值計算的效率比傳統有限元方法高,使用向量式有限元素法分析因波浪作用而造成海域平台之動力分析應是一個具有優勢的解決方法。藉由本研究所發展的向量式有限元分析理論進行分析海域平台的動力反應,其每一個節點的垂直及水平位移均可求得。由本研究所發展的分析理論:向量式有限元素法,對於分析因波浪作用所造成海域平台之動力反應可獲致令人滿意的成果。 |
英文摘要 | A vector form intrinsic finite element (VFIFE) method of plane frame element is adapted and applied to the study of dynamic responses of offshore template platform under wave forces. The method adopted in this study is a scheme by updating the geometry of the structural system during the calculation of each time step, which is also called the coordinate moving frame approach, by avoiding the calculation of inverse matrix to improve the computational efficiency. In this study, in order to take the time-saving advantage during the dynamic analysis, a solution procedure by using VFIFE method is developed in cooperating with the interactions between wave motions and offshore structure. The efficiency of numerical computation compared against the traditional finite element method is also examined and then, a typical offshore template structure is analyzed for the dynamic behavior by utilizing the developed solution scheme. The motions in the horizontal and vertical direction at each joint of the structure are calculated and presented into figures. It is found from this study that the new developed VFIFE could be a promising method in analyzing the offshore template structures subject to wave motions in the ocean. |
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