| 研究生: |
陳孟陽 Chen, Meng-Yang |
|---|---|
| 論文名稱: |
邊界元素法於三維異向性含等效體力靜彈之優化計算與軟體視窗設計 Optimal Calculation and Software Visual Design for the Boundary Element Analysis of Three-Dimensional Anisotropic Elastostatics with Equivalent Body Forces |
| 指導教授: |
夏育群
Shiah, Yui-Chuin |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 航空太空工程學系 Department of Aeronautics & Astronautics |
| 論文出版年: | 2021 |
| 畢業學年度: | 109 |
| 語文別: | 中文 |
| 論文頁數: | 84 |
| 中文關鍵詞: | 三維異向性靜彈性體 、邊界元素法 、優化計算 、軟體視窗設計 |
| 外文關鍵詞: | three-dimensional anisotropic elastostatics, boundary element method, optimal caculation, software visual design |
| 相關次數: | 點閱:82 下載:0 |
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目前邊界元素法能利用直接轉換體積分來處理三維異向性含等效應力之靜彈問題,不過若要分析薄層幾何體,基本解會遇到奇異性問題造成誤差過大結果不夠準確。為了降低誤差,可先將基本解的被積元素轉換為高斯積分,再增加積分的高斯積分點。透過模擬的數值結果可得知幾何體越薄需要越多的高斯點,而增加積分的高斯點會大量增加程式計算時間,所以本論文也將格林函數的傅立葉級數進行公式簡化,利用格林函數的係數奇偶性與共軛複數的性質,將傅立葉級數的計算範圍縮小,避免重複計算,提高公式計算效率,從而減少計算時間。而將優化後的公式改寫入程式,與有限元素法ANSYS比對數個範例後,確實比起先前的結果誤差更小,答案較為精確。而為了降低在分析上的操作複雜性,利用軟體程式語法設計出一個視窗頁面,輸入所需的參數後便可由執行檔進行分析,在操作分析頁面上更為清楚且簡單。
As present, the boundary element method can analize three-dimensional anisotropic elastostatics with equivalent body force by direct transformation of the volume integral. However, when analizing a thin layer geometry model, the basic solution will encounter singularity problem. It will casue the excessive error and imprecise result. In order to reduce the error, the element of basic solution can convert into Gauss integration first, then increasing the Gauss points.Through the numerical results of the simulation, it can be known that the thinner the geometry model, the more Gauss points will be needed. Because increase the Gauss points will greatly raise the calculate time, therefore the thisis also simplified the Fourier series of Green’s function. By using the properties of odd number with even nember and the properties of conjugate complex numbers, it can reduce the calculation range of the Fourier series, aviod repeated calculation, improve formula calculation efficency, and decrease the computing time.After the optimized formula results were changed into programs, and compared with several examples of the finite element method ANSYS, the error was indeed smaller than the previous results.In other words, the answers got more accurate.At last for reducing the complexity of analysis operation, a visual page was designed by a software program.After entering some required parameters, the file can analize the model.It is clearer and more simplified for opertion anlysis pages.
[1] F. Rizzo and D. Shippy, "An advanced boundary integral equation method for three‐dimensional thermoelasticity," International Journal for Numerical Methods in Engineering, vol. 11, no. 11, pp. 1753-1768, 1977.
[2] Zang, J.J.; Tan, C.L.; and Afagh, F.F. (1996): A general exact transformation of body-force volume integral in BEM for 2D anisotropic elasticity, Computational Mechanics, 19: 1-10.
[3] Zang, J.J.; Tan, C.L.; and Afagh, F.F. (1997): Treatment of body-force volume integrals in BEM by exact transformation for 2D anisotropic elasticity. Int. J. NUmer. Meth. Engng. 40: 89-109.
[4] Y.C. Shiah, " Analytical Transformation of the Volume Integral for the BEM Treating 3D Anisotropic Elastostatics Involving Body-Force," Computer Methods in Applied Mechanics and Engineering, vol. 278, pp. 402-422, 2014.
[5] Y. Shiah and C. Tan, "Exact boundary integral transformation of the thermoelastic domain integral in BEM for general 2D anisotropic elasticity," Computational Mechanics, vol. 23, no. 1, pp. 87-96, 1999.
[6] Y.-C. Shiah and J.-Y. Chong, "Boundary Element Analysis of Interior
Thermoelastic Stresses in Three-Dimensional Generally Anisotropic
Bodies," Journal of Mechanics, vol. 32, no. 6, pp. 725-735, 2016.
[7] Y. Shiah et al., "Direct volume-to-surface integral transformation for 2D BEM analysis of anisotropic thermoelasticity," CMES-Computer Modeling in Engineering and Sciences, vol. 102, no. 4, pp. 257-270, 2014.
[8] Y.C. Shiah, Nguyen Anh Tuan, and M.R.Hematiyan, "Direct transformation of the volume integral in the boundary integral equation for treating three-dimensional steady-state anisotropic thermoelasticity involving volume heat source, " International Journal of Solids and Structures, vol. 143, pp. 287-297, 2018.
[9] T. Ting and V.G. Lee, "The three-dimensional elastostic Green's for general anisotropic linear elastic solid," Q. J. Mech. Appl. Math., 50,pp. 407-426, 1997.
[10] Y.C. Shiah, C.L. Tan and V.G. Lee, "Evaluation of explicit-form fundamental solutions for displacements and stresses in 3D anisotropic in 3D anisotropic elastic solids," CMES-Comp.Modeling Eng. & Sci., 34, pp. 205-226, 2008.
[11] Y.C. Shiah, C.L. Tan and R.F. Lee, "Internal point solutions for displacements and stresses in 3D anisotropic elastic solids using the boundary element method." CMES-Comp.Modeling Eng. & Sci., vol.69, pp. 167-197, 2010.
[12] Y.C. Shiah and C.L. Tan, "Higher-order Green's function derivatives and BEM evaluation of stresses at interior points in a 3D generally anisotropic solid." CMES-Comp.Modeling Eng. & Sci.,78, pp. 95-108, 2011.
[13] Y.C. Shiah, C.L. Tan and C.Y. Wang, "Efficient Computation of the Green's Function and its Derivatives for Three-Dimensional Anisotropic Elasticity in BEM Analysis," Engng. Analysis Boundary Elem., 36,pp. 1746-1755, 2012.
[14] Y.C. Shiah, C.L. Tan and C.Y. Wang, "An Improved Numerical Evaluation Scheme of the Fundamental Solution and its Derivatives for 3D Anisotropic Elasticity Based on Fourier Series," CMES-Comp. Modeling Eng. & Sci., 87 (1), pp. 1-22, 2012.
[15] C.L. Tan, Y.C. Shiah and C.Y. Wang, "Boundary Element Elastic Stress Analysis of 3D Generally Anisotropic Solids Using Fundamental Solutions Based on Fourier Series," Int. J. Solids Struct., 50,pp. 2701-2711, 2013.
[16] Y.C. Shiah, C.L. Tan and Y.H. Chen, "Efficient BEM Stress Analysis of 3D Generally Anisotropic Elastic Solids With Stress Concentrations and Cracks," CMES-Comp.Modeling Eng. & Sci.,vol. 96, pp. 243-257, 2013.
[17] C.L. Tan, Y.C. Shiah and C. Lin " Stress analysis of 3D generally anisotropic elastic solids using the boundary element method," Computer Modeling in Engineering and Sciences, vol. 41, no. 3, pp. 195, 2009.
[18] V.-G. Lee, "Explicit expression of derivatives of elastic Green’s functions for general anisotropic materials," Mechanics Research Communications, vol. 30, no. 3, pp. 241-249, 2003.
校內:2026-08-20公開