臺灣博碩士論文加值系統

本研究主要探討是否可以使用質點耦合的方式來代替整體模型進行分析，主要目的為增加計算效率及減省計算時間。
本研究使用有限元素軟體ANSYS進行水下載具碰撞的數值模擬，利用暫態分析求解器進行分析。由於碰撞時最大碰撞負荷一定是位於全艦的前端的碰撞處，因此為了增加計算效率，本研究利用ANSYS中耦合的功能，只建立艦艏較重要的部分及主要結構，其餘部分則計算其質量，再利用質點耦合(Coupling)在艦艏後段邊緣處，這麼一來就能有效減少分析軟體的計算時間。
本研究利用簡易模型計算及比較兩者的結果時，發現利用整體模型及耦合質點的模型在撞擊點附近節點之等效應力(von-Mises Stress)值在5%的差異以內，在這樣的誤差內，應證了此方法有極佳的準確性，因此在未來相關的分析上都可以使用這個方法來進行模擬。
耦合模型是利用質點代替隱藏模型之質量模型。

A procedure is in order to increasing computational efficiency& saving time,
the study of using coupling node coupled model to replace the whole model, the main purpose is increase computational efficiency& save calculating time.
In ANSYS, the finite element analysis software, we used transient solver to simulate the analysis of collision in underwater vehicle bottoming. In order to increase computational efficiency, using coupling, the function in ANSYS. The first thing we should do is to create the mainly structure with bow. Second, is to coupled mass to the model that’s the mass is the model which is not be created.
Compare whole model & coupled model in this study, we can found that the deviation of two model in von-Mises Stress, is under 5%, so we can say that the method we used is very accurate. So we can use this method in other related analysis.
Coupling Model that we called in this thesis is a model using a coupling method..

誌謝
摘要
ABSTRACT
目錄
圖目錄
表目錄
符號表
第一章 緒論
1.1研究動機
1.2文獻回顧
1.3論文架構
第二章 APDL的求解器及約束條件之基礎理論
2.1 暫態求解器
2.2 ANSYS表面約束方法
2.3 設定時間分析步
第三章 簡易模型碰撞分析及驗證
3.1模型建立
3.1.1未加肋模型尺寸
3.1.2加肋之簡易模型尺寸
3.2 元素選用
3.3 材料參數
3.4 邊界條件
3.5 分析結果
3.5.1 碰撞時間的差異
3.5.2 未加肋之簡易模型(FM與CM)
3.5.3 加肋之簡易模型(FM-R與CM-R)
第四章 壓力殼碰撞實例分析
4.1 模型建立
4.1.1整體模型
4.1.2耦合模型
4.2材料參數
4.3邊界設定
4.4分析結果
4.5模型修正
第五章 研究結論與未來展望
5.1 結論
5.2未來展望
參考文獻

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