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研究生:許朝鈞
研究生(外文):Hsu, Chaochun
論文名稱:水下爆炸引致巨大空蝕與高速噴流對船舶結構之動態反應分析
論文名稱(外文):A Study of Ship Structural Dynamic Responses Subject Bulk Cavitation and High-Speed Jet Induced by Underwater Explosion
指導教授:梁卓中梁卓中引用關係徐慶瑜
指導教授(外文):Liang,ChochungHsu, Chingyu
口試委員:史建中鄧作樑梁卓中徐慶瑜
口試委員(外文):Shih, ChienjongTeng,TsoliangLiang,ChochungHsu, Chingyu
口試日期:2012-07-10
學位類別:碩士
校院名稱:大葉大學
系所名稱:機械與自動化工程學系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:112
中文關鍵詞:水下爆炸巨大空蝕區高速噴流
外文關鍵詞:underwater explosionbulk cavitationhigh-speed jet
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水下爆炸通常有兩個主要階段,分別為爆震波(Shock wave)與氣泡脈動(Bubble pulse)。在爆震波階段,會於接近自由液面處,構成一個爆炸「氣體 - 水 - 空氣」的系統,當爆震波與自由液面的交互作用下,會產生了巨大空蝕區(Bulk cavitation)現象。在氣泡脈動階段,氣泡在收縮與膨脹過程中,加上水的浮力作用下,伴隨發生上浮運動,最後崩潰時引致高速噴流現象。巨大空蝕區的效應與氣泡崩潰引致的高速噴流對水面的船體結構具有一定的損傷程度,故在水下爆炸後船體結構的整體效應分析,必須將巨大空蝕與氣泡崩潰引致高速噴流效應之影響納入考量。
本論文以巨大空蝕與氣泡崩潰引致高速噴流效應為研究對象。利用ABAQUS有限元素軟體為工具,運用CEL(Couple Eulerian-Lagrangian)理論,並與Ramajeyathilagam和Vendhan[34]探討平板在受水下爆炸衝擊後,平板變形之實驗結果進行驗證;最後以某型船艦為對象,分別探討船體結構在巨大空蝕區墜落與氣泡崩潰引致高速噴流撞擊至船體結構之損傷分析;本論文研究之成果可提供船艦結構設計者進行船體結構設計時使用。

Underwater explosion usually has two stages, including shock wave and bubble pulse. When shock wave and free surface interact, this will produce bulk cavitation. During the bubble pulse stage, the bubble will experience expansion and contraction in the collapse phase of bubble, a high-speed jet is produced. Bulk cavitation and high-speed jet may cause serious damage for ship structure. So this paper presents a study about the effect of bulk cavitation and high-speed jet on structures in an underwater explosion.
To investigate the such problems mentioned above, the Finite Element Method (FEM) was applied. The Couple Eulerain-Lagrangian technique embed in ABAQUS software was used to solve the ship structural dynamic responses subject bulk cavitation and high-speed jet induced by underwater explosion in simulation. Furthermore, in this present paper, the response of a plate due to the shock wave induced by underwater explosion was also studied and verified by experimental study of Ramajeyathilagam & Vendhan[35]. For studying the effects of bulk cavitation and high-speed jet, a ship model was used as the object of study. The numerical result in this study may provide same helpful informations for the shipdesign work.

封面內頁
簽名頁
中文摘要..................................................................................................iii
ABSTRACT..................................................................................................iv
誌謝........................................................................................................v
目錄.......................................................................................................ix
圖目錄....................................................................................................xii
表目錄....................................................................................................xvi

第一章 緒論............................................................................................... ..1
1.1前言.....................................................................................................1
1.1.1 爆震波傳遞至自由面...................................................................................2
1.1.2 震波反射引致巨大空蝕.................................................................................2
1.1.3 氣泡脈動............................................................................................3
1.2文獻回顧.................................................................................................4
1.2.1 巨大空蝕相關參考文獻.................................................................................4
1.2.2 氣泡崩潰引致噴流相關參考文獻..........................................................................6
1.3本文目的.................................................................................................8
第二章 理論基礎.............................................................................................17
2.1 ABAQUS簡介.............................................................................................17
2.1.1 前處理(Perprocessing).............................................................................18
2.1.2 模擬計算(Simulation)...............................................................................19
2.1.3 後處理(Postprocessing)............................................................................20
2.2 ABAQUS顯示動態分析(Explicit Dynamic Analysis)...........................................................20
2.3 Couple Eulerian-Lagrangian理論.........................................................................22
2.4巨大空蝕理論.............................................................................................24
2.4.1 巨大空蝕區上邊界....................................................................................25
2.4.2 巨大空蝕區下邊界....................................................................................26
第三章 實例驗證.............................................................................................29
3.1 巨大空蝕區域驗證........................................................................................29
3.2 應用CEL分析方法驗證.....................................................................................29
3.2.1 模型介紹...........................................................................................30
3.2.2 材料參數...........................................................................................31
3.2.3 實驗條件...........................................................................................31
3.2.4 結果與討論.........................................................................................32
第四章 水下爆炸引致巨大空蝕區造成船艦結構墜落時之結構動態
效應分析.............................................................................................44
4.1 模型介紹...............................................................................................44
4.2 材料參數與元素介紹.......................................................................................44
4.3 邊界與負載設定..........................................................................................46
4.4 結果與討論..............................................................................................46
4.4.1 船體結構損傷分析....................................................................................47
4.4.2 流體動態反應.......................................................................................50
4.4.2.1自由液面最外側流體速度動態歷程.........................................................................50
4.4.2.2巨大空蝕區最外側流體速度動態歷程.......................................................................51
第五章 船體結構承受高速噴流負荷時之結構動態效應分析..............................................................64
5.1 模型介紹...............................................................................................64
5.2 材料參數與元素介紹.......................................................................................64
5.3 邊界與負載設定..........................................................................................65
5.4 結果與討論..............................................................................................65
5.4.1噴流速度130m/s撞擊船體結構..............................................................................65
5.4.2噴流速度170m/s撞擊船體結構..............................................................................68
5.4.3結果比較與討論.........................................................................................71
第六章 結論與未來展望........................................................................................86
6.1船體結構在巨大空蝕區墜落時之動態效應分析結論.................................................................86
6.2船體結構承受高速噴流負荷時之動態效應分析結論.................................................................87
6.3總結論與未來展望.........................................................................................89
參考文獻...................................................................................................91
附錄.......................................................................................................95





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