自動化分解薄殼CAD模型殼本體之增強演算法發展

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姓名

方聲翔(Sheng-Hsiang Fang) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

自動化分解薄殼CAD模型殼本體之增強演算法發展

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摘要(中)

模流分析(Mold flow analysis)是一種有限元素分析，在執行模流分析前，需將CAD模型轉換成實體網格(Solid mesh)，再賦與分析軟體計算。為提升分析之準確度，對CAD模型建構品質與精度較高的結構化網格是解決方案，但現今結構化網格主要以非自動化方式建立。本研究之目的是發展應用於薄殼CAD模型之薄殼本體體積分解演算法，藉以輔助結構化網格之建立。本演算法自動化將薄殼本體分解為規則區塊之組合，各獨立的區塊表示自薄殼本體分解的實際體積。區塊是以封閉輪廓的方式記錄，能提供建立結構化網格之輔助資訊，區塊間亦記錄關聯性，以確保網格間正確接合。本研究發展之演算法能分解坐落凸起特徵之薄殼本體，亦拓展應用性至具階梯層結構或多種複雜交界結構之薄殼本體。對於分解坐落凸起特徵之薄殼本體，結合凸起特徵辨識技術。而對於分解具階梯層結構或多種複雜交界結構之薄殼本體，則將薄殼本體分離為多個區域獨立分解，再記錄區域間的對應資料。本研究發展自動化分解薄殼本體為規則區塊之技術，藉以提供建立結構化網格之資料。

摘要(英)

Mold flow analysis is a kind of finite element analysis. Before performing mold flow analysis, the CAD model needs to be converted into solid meshes and then assigned to the analysis software for calculation. In order to improve the accuracy of the analysis, it is a solution to construct structured meshes with high quality and accuracy for the CAD model, but nowadays the structured mesh is mainly established in a non-automatic way. The purpose of this research is to develop a volume decomposition algorithm for the thin shell body of thin shell CAD models, so as to assist the establishment of structured mesh. The algorithm automatically decomposes the thin shell body into a combination of regular blocks, each of which represents the actual volume decomposed from the thin shell body. Blocks are recorded in the form of closed regions, which can provide auxiliary information for building structured meshes, and the associations between blocks are also recorded to ensure proper connection between meshes. The algorithm developed in this study can decompose the thin shell bodies with protrusion features, and also expand the applicability to the thin shell bodies with stepped structures or various complex transition structures. For the decomposition of the thin shell body with protrusion features, the proposed method combines with the feature recognition technology. For the decomposition of the thin shell body with stepped structures or various complex transition structures, the proposed method is to divide the thin shell body into multiple areas and then decomposed them independently. The main purpose of this study is to develop the enhanced algorithm of automatically decomposing the thin shell body into regular blocks, so as to provide data for building structured meshes.

關鍵字(中)

★ 體積分解
★ 結構化網格
★ 模流分析
★ 薄殼CAD模型

關鍵字(英)

★ Volume decomposition
★ Structured mesh
★ Mold flow analysis
★ Thin shell CAD model

論文目次

摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VII
表目錄 XIII
第一章緒論 1
1.1前言 1
1.2文獻回顧 4
1.3研究目的 6
1.4研究方法 7
1.5論文架構 10
第二章薄殼CAD模型前處理資料 11
2.1前言 11
2.2邊關聯性及面關聯性資料庫 11
2.3薄殼CAD模型組成面資料 14
2.3.1薄殼模型組成面分類 14
2.3.2薄殼模型之外部面分析 18
2.3.3薄殼模型之交界區域分析 21
2.4薄殼CAD模型凸起特徵資料 24
2.4.1凸起特徵分類 24
2.4.2凸起特徵分解 28
2.4.3凸起特徵辨識輸出資料 29
第三章薄殼本體體積分解演算法 35
3.1前言 35
3.2薄殼本體體積分解名詞定義 35
3.3薄殼本體體積分解演算法整體說明 44
3.4建立薄殼本體面資料 48
3.4.1薄殼本體面分群 48
3.4.2薄殼本體面群配對 59
3.4.3薄殼本體面群區域分割 64
3.4.4薄殼本體面資料之建立結果 69
3.5建立薄殼本體區塊 72
3.5.1建立薄殼主要區塊 72
3.5.2建立薄殼連接區塊 85
3.5.3建立薄殼角落區塊 90
3.6建立薄殼特徵區塊 95
3.6.1建立薄殼特徵主要區塊 95
3.6.2建立薄殼特徵連接區塊 103
第四章薄殼本體分解技術之結果分析 107
4.1前言 107
4.2薄殼本體分解技術之測試結果 107
4.2.1薄殼本體分解技術之整體結果 110
4.2.2一般模型之薄殼本體分解結果分析 121
4.2.3凹陷底模型之薄殼本體分解結果分析 124
4.2.4階梯層模型之薄殼本體分解結果分析 127
4.2.5複雜交界模型之薄殼本體分解結果分析 130
4.2.6薄殼本體分解技術之失敗案例說明 138
4.3薄殼區塊之網格化與品質分析 141
4.3.1薄殼區塊之結構化網格建立方法 141
4.3.2結構化網格之品質分析 141
第五章結論與未來展望 146
5.1 結論 146
5.2 未來展望 147
參考文獻 149

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指導教授

賴景義(Jiing-Yih Lai)

審核日期

2022-7-20

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