臺灣博碩士論文加值系統

潛艦壓力殼外有外殼及水包覆，當潛艦承受水下爆炸時，壓力殼並非承受所有的爆炸負荷，本研究藉由數值模擬方式探討不同情況下承受水下爆炸的結構響應，本研究使用實體元素建立各種結構的模型，並以ABAQUS/Acoustic進行水下爆炸的模擬。
　 根據相關研究文獻指出，結構在水中能夠降低40%到50%左右的頻率，雖然並沒有指出水能夠降低多少結構的應力，但以可知道水對於降低結構所承受的負荷，有一定的降幅，而我們先使用雙殼圓筒來做模擬，目的是要模擬水的阻尼效應，經數值模擬結果顯示，內外殼之間的水確實能夠有效地減輕減少水下爆炸所產生的負荷，並降低應力約50%。接著將壓力殼尺寸拉長至30公尺時，並且內殼採用壓力殼的結構，外殼維持單殼結構，但兩殼之間用肋骨連結，我們設計兩種狀況，兩殼之間分別有充滿水與沒水。在經過模擬後發現，在裝滿水的狀態下，壓力殼所承受的應力在整體的趨勢上確實是比較低的，但是在最大應力卻與壓力殼內無水時相差無幾。
本研究的結果發現，水確實能夠降低爆炸後外殼傳遞到內殼上的應力，但必須在內外結構沒有連結的狀態下，一旦內外結構相連結，在內外殼之間裝滿水的狀況，雖然整體趨勢上承受較低的應力，但是在最大應力上卻是相差不多，推測是因為壓力殼內為封閉式的結構，而水的壓縮模數極大無法隨意變化體積，當水充滿在殼中時可視為類似剛性結構的一種，在承受衝擊力的情況下，應力不只透過結構傳遞，也會透過水傳遞。

This study examined the Dynamic response of the non-contact underwater explosion on Double-Hull pressure hull. The outer hull is a single plate and The inner hull is a pressure hull. The space between the outer hull and inner hull that be full of water or be empty. We used ABAQUS/Acoustic to simulation underwater explosion on the Double-Hull pressure hull, and then compare the different between that the hull be full of water or be empty.
The data that we collecting show water can decrease the vibration frequency of structure about 40% to 50%. First, we have to know whether ABAQUS can simulating structural vibration coupled with water. We prepare a circular tank with double-shell construction.. There is no connected construction between the outer shell and inner shell. We use this model to verity the damping of water that can simulating by ABAQUS. Next, we set an explosion on the model, then we find out the result that water can down the stress about 50%. The consequent is similar to the experiment data that we collecting.
After simulating the damping of water by ABAQUS, we expand tank model to 30M. The outer hull is still a single shell but the inner hull change to a pressure hull. There are six ring-shell connecting the outer shell and inner shell. After ABAQUS simulate the explosion on the models, we find out the average stress on the model full of water is smaller than the model empty of water but the maximum stress is very similar to the empty model.
The result helps us knowing that water can decreasing the inner-shell’s stress that the hull have no water. Once the pressure hull connect the light hull by ring-shell and the structure is full of water, the average stress of pressure hull is decreased but the maximum stress just decrease a little. We speculate that when the closed structure is filled with water, the water will be similar to a rigid structure. So the water transfer force also.

摘要 I
Abstract II
誌謝 III
目錄 IV
圖目錄 VI
表目錄 VIII
符號表 IX
一、緒論 1
1.1 研究動機 1
1.2 文獻回顧 2
1.3 論文架構 2
二、水阻尼理論與分析參數 4
2.1 水阻尼理論 4
2.2 壓力殼設計流程 6
2.2.1 BSI-PD5500規範 6
2.2.2 壓力殼厚度設計流程 6
2.2.3 肋骨尺寸設計 9
2.3 水下爆炸參數 11
2.4 邊界條件 13
三、水阻尼效應模擬 15
3.1圓筒殼模型 15
3.2圓筒殼模型強度分析 16
四、壓力殼強度分析 19
4.1壓力殼模型 19
4.2水下衝擊模擬 21
五、結論與未來展望 33
5.1結論 33
5.2未來展望 34
參考文獻 36

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