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研究生: 胡政弘
Hu, Cheng-Hung
論文名稱: 以深度能量法分析物理耦合問題
Analyze Physical Coupling Problems Using The Deep Energy Method
指導教授: 林冠中
Lin, Kuan-Chung
學位類別: 碩士
Master
系所名稱: 工學院 - 土木工程學系
Department of Civil Engineering
論文出版年: 2023
畢業學年度: 111
語文別: 中文
論文頁數: 63
中文關鍵詞: 深度學習最小勢能法深度能量法耦合問題
外文關鍵詞: Deep Learning, The Principle Of Minimum Potential Energy, DEM, Coupling
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  • 深度能量法(Deep Energy Method, DEM)是一種新穎的數值模擬方法,通過結合深度學習和傳統的能量法,能夠更加準確地解決複雜的物理問題。深度能量法通常使用類深度神經網絡進行建模,利用前向傳播和反向傳播算法進行訓練,並在人工神經網絡的幫助下最小化勢能。與傳統的數值方法相比,深度能量法具有許多優勢,例如能夠自適應地學習複雜的物理現象、快速收斂、節省計算成本等,深度能量法還可以通過對神經網絡架構和訓練算法的改進,進一步提高模擬的精度和效率。
    許多工程存在能量泛函的問題,深度能量法是一種非常靈活和高效的方法,因為它只需要定義能量函數即可進行分析,而不需要對統御方程式進行求解。此外,標準優化器能夠通過迭代來尋找最小值,而不需要對問題進行繁瑣的手動調整。這種方法通過使用前向傳播的過程來進行無約束逼近,可以快速地進行數值分析,並且受到邊界條件的約束以形成最終預測。
    透過求解壓電材料梁及熱彈性體等耦合問題,驗證了本法的有效性,提供了一種新的數值分析方法。

    The Deep Energy Method (DEM) is a novel numerical simulation method that combines deep learning and traditional energy methods to more accurately solve complex physical problems. DEM typically uses a deep neural network for modeling, training using forward and backward propagation algorithms, and minimizing potential energy with the help of artificial neural networks. Compared to traditional numerical methods, DEM has many advantages, such as being able to adaptively learn complex physical phenomena, fast convergence, and saving computational costs. Additionally, by improving the neural network architecture and training algorithm, the accuracy and efficiency of simulations can be further improved.
    Many engineering problems involve energy functional issues, and the Deep Energy Method is a very flexible and efficient method because it only needs to define the energy function for analysis without solving equations. In addition, standard optimizers can find the minimum value through iterations without requiring tedious manual adjustments. This method uses the forward propagation process to perform unconstrained approximation, allowing for quick numerical analysis and being constrained by boundary conditions to form the final prediction.
    Through solving coupled problems such as piezoelectric material beams and thermoelastic bodies, the effectiveness of this method has been verified and provides a new numerical analysis method.

    摘要 I Abstract II 致謝 V 目錄 VI 表目錄 VIII 圖目錄 IX 第一章 緒論 1 1-1 前言 1 1-2 研究動機 3 1-3 文獻回顧 4 1-4 本文結構 6 第二章 深度能量法介紹 7 2-1 神經網路 7 2-2 損失函數 10 2-3 反向傳播算法 11 2-4 深度能量法 13 2-4.1 彈性方程式 14 2-4.2 熱方程式 15 2-4.3 一維彈性體 16 2-4.4 二維彈性體範例 18 第三章 物理耦合問題分析與討論 22 3.1 熱機耦合(Thermoelasticity) 22 3-1.1 依序解 24 3-1.2 耦合解 24 3-1.3 層數探討 25 3.2 壓電材料(Piezoelectric material) 28 3-2.1 雙層壓電懸臂梁 30 3-2.2 受剪力變形之正方形壓電條板 39 3-2.3 受撓曲變形之正方形壓電條板 48 第四章 結論與建議 57 4-1 結論 57 4-2 建議與未來展望 57 參考文獻 58

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