| 研究生: |
洪國揚 Hung, Kuo-Yang |
|---|---|
| 論文名稱: |
使用有限元素法探討加肋薄殼的自由振動問題 |
| 指導教授: |
吳重雄
Wu, Jong-Shyong |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 造船及船舶機械工程學系 Department of Systems and Naval Mechatronic Engineering |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 72 |
| 中文關鍵詞: | 自由振動 、有限元素法 、加肋 、薄殼 |
| 外文關鍵詞: | stiffener, thin shell, finite element, free vibration |
| 相關次數: | 點閱:112 下載:1 |
| 分享至: |
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本文之主旨在於使用傳統的有限元素法來探討加肋圓柱型薄殼的振動問題。首先,吾人使用三維四節點的長方形薄板元素來取代各個薄殼元素,再利用座標轉換與一般矩陣的組合技巧來求得整個無加肋圓柱型薄殼的勁度矩陣與質量矩陣。接著,吾人使用三維二節點的直樑元素來取代加勁材元素,再利用座標轉換與矩陣組合的技巧,將直樑元素之性質矩陣的效應施加到上述無加肋圓柱型薄殼的整體性質矩陣上,而求得整個加肋圓柱型薄板的勁度矩陣與質量矩陣,最後,再考慮整個結構系統的邊界支撐條件而得特徵值方程式,解之則得加肋圓柱型薄殼的自然頻率與振態。無論是否具有加勁材,本文所得圓柱型薄殼之自然頻率均與現有文獻所提供者非常接近,可見本文電算程式之可靠性應無問題。本文之研究重點包括圓柱型殼之後度與曲率半徑,以及加勁材之尺寸與佈置方式對整個加肋圓柱型薄殼自然頻率的影響。
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