非結構化四邊形網格自動建構研究

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/95824

Title:	非結構化四邊形網格自動建構研究
Authors:	李奇勳;Lee, Chi-Hsun
Contributors:	機械工程學系
Keywords:	模流分析;自動化非結構四邊形網格建構;狹長角度;邊長過長及過短;局部品質不佳;網格生成錯誤及封閉;Paving演算法;mold flow analysis;automated unstructured quadrilateral mesh construction;narrow angles;side lengths that are too long and too short;poor local quality;mesh generation errors and closure;Paving algorithm
Date:	2024-07-09
Issue Date:	2024-10-09 17:18:50 (UTC+8)
Publisher:	國立中央大學
Abstract:	模流分析應用於各種射出成型產品，有助於生產高質量的零件，它針對塑料件的射出、保壓、冷卻及翹曲等過程進行有限元素分析，且透過實體網格進行模擬分析，因此進行模流分析前，需將IC CAD模型轉換為實體網格，再由求解器計算。其中六面體網格被視為品質最佳的網格型式，而建構六面體網格的前提是生成四邊形網格，然而，自動化的四邊形網格建構難度較高，通常需透過人工方式進行建構，而人工方式進行建構需耗費大量時間，為此本實驗室致力於開發自動化的非結構四邊形網格建構技術，在發展階段中，需面臨網格具有狹長角度、網格邊長過長及過短、局部網格品質不佳、網格生成錯誤與網格封閉等情況。為了應對以上情況，本研究基於Paving演算法，對演算法進行改良，並完善網格的建構流程，且各項函式中完善的偵測方法與網格修正方法為針對IC CAD模型廣泛測試而得，也進而確保其程式執行上的穩定性，並針對函式中各項參數的探討，比較參數改變的影響一併得出最佳參數組合。;Mold flow analysis is used in various injection molding products to help produce high-quality parts. It performs finite element analysis on the injection, pressure holding, cooling and warping processes of plastic parts, and through the solid network Grid is used for simulation analysis, so before conducting mold flow analysis, the IC CAD model needs to be converted into a solid mesh, and then calculated by the solver. Among them, hexahedral mesh is regarded as the best quality mesh type, and the prerequisite for constructing hexahedral mesh is to generate quadrilateral mesh. However, automatic quadrilateral mesh construction is more difficult and usually requires manual construction. Manual construction takes a lot of time. Therefore, our laboratory is committed to developing automated unstructured quadrilateral mesh construction technology. During the development stage, we need to face the problems of meshes with narrow angles, mesh side lengths that are too long or too short, Poor local mesh quality, mesh generation errors, mesh closure, etc. In order to cope with the above situation, this study improves the algorithm based on the Paving algorithm and improves the grid construction process. The perfect detection methods and grid correction methods in each function are developed for extensive testing of IC CAD models. In order to ensure the stability of the execution of the program, various parameters in the function are discussed, the effects of parameter changes are compared, and the best parameter combination is obtained.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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