3D CAD模型之肋特徵設計變更技術研究｜國立中央大學博碩士論文系統

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研究生：	吳智瑋 ZHI-WEI WU
論文名稱：	3D CAD模型之肋特徵設計變更技術研究
指導教授：	賴景義 Jiing-Yih Lai
口試委員:
學位類別：	碩士 Master
系所名稱：	工學院 - 機械工程學系 Department of Mechanical Engineering
論文出版年：	2018
畢業學年度：	107
語文別：	中文
論文頁數：	118
中文關鍵詞：	肋、設計變更
相關次數：	點閱：8 下載：0
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直接建模為目前市面上多數CAD (Computer-Aided Design)軟體所使用的建模方法，但多數CAD軟體在修改功能上並未與特徵辨識進行結合，其目的主要為模型編輯之靈活性。然而，當使用者欲修改模型中多處之幾何外形時，則須手動選取，此過程較為浪費時間，因此本研究擬在Rhinoceros平台發展出一套針對模型中之肋特徵設計變更之系統，並依據肋特徵須修改之種類發展出五項修改功能。本研究以模型的B-rep資料結構與肋特徵辨識之結果為基礎建立特徵中點、邊、面彼此拓撲關係，並以曲面移動、旋轉與計算幾何之方式推算變更後之形狀來改變其幾何資訊，以達到變更之目的，對於變更後之結果，本研究以原模型與變更後模型之體積差，作為是否完成變更修改之依據。

Most CAD software in the market use the technique called direct modeling to build up models. However, most CAD software do not combine with features recognition in modifying. Doing the features recognition can make the modifying easier. When users need to change designs in many features, users need to choose the features by hand. This process causes lots of time. Therefore, our study develops a system to modify ribs in thin shell parts on Rhinoceros platform. And according to different types of ribs, our study develops five functions to modify. Our study uses the B-rep data structure and the results of rib feature recognition to build up the topology relationship between points, edges and faces. Using these information to translate surfaces or rotate surfaces after calculating the expected results. Moreover, changing the geometric information in order to achieve the design changes. For the modifying results, our study checks the difference of volume to be our rest on modifying successful or not.

目錄
摘要.................................................... I
Abstract ...............................................II
致謝....................................................III
目錄.................................................... IV
圖目錄.................................................. VI
表目錄....................................................X
第一章緒論................................................1
1.1前言...................................................1
1.2文獻回顧...............................................2
1.3研究目的與方法..........................................5
1.3.1研究目的.............................................5
1.3.2研究方法.............................................6
1.4論文架構..............................................10
第二章Moldflow與Rhinoceros設計變更功能說明.................11
2.1 Moldflow-Tools功能整體說明............................11
2.2 Moldflow設計變更功能說明..............................18
2.3 Rhinoceros控制點修改功能說明..........................26
2.4 結論.................................................34
第三章肋特徵與設計變更演算法...............................36
3.1 B-rep架構介紹........................................36
3.2肋特徵定義............................................39
3.3 設計變更整體說明......................................41
3.4資料結構..............................................47
3.4.1肋特徵之資料結構.....................................51
3.4.2設計變更之資料結構...................................51
3.5設計變更說明...........................................57
3.6面修改演算法...........................................60
第四章 程式操作說明及案例測試與討論.........................71
4.1 系統操作說明..........................................71
4.2 CAD模型測試..........................................76
4.3問題討論..............................................88
4.4結論..................................................95
第五章未來展望 ...........................................99
5.1結論..................................................99
5.2未來展望.............................................100
參考文獻................................................102
                                

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[11]王明暄，應用於模流分析之CAD模型特徵辨識與實體網格品質提升之研究，國立中央大學博士論文，2017。
[12]Rhinoceros. http://www.rhino3d.com.
[13]openNURBS. http://www.rhino3d.com/tw/opennurbs.
[14]B-rep Data Structure. http://wiki.mcneel.com/developer/brepstructure

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