3D CAD模型之肋特徵設計變更技術研究

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姓名

吳智瑋(ZHI-WEI WU) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

3D CAD模型之肋特徵設計變更技術研究

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摘要(中)

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。

摘要(英)

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.

關鍵字(中)

★ 肋
★ 設計變更

關鍵字(英)

★ B-rep
★ CAD
★ rib
★ direct modeling

論文目次

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

參考文獻

[1] H. K. Ault and A. D. Phillips, “Direct modeling: Easy changes in CAD?” 70th EDGE Midyear Conference, pp. 99–106, 2016.
[2] Q. Zou and H. Y. Feng, “Push-pull direct modeling of solid CAD models,” Advances in Engineering Software, Vol. 127, pp. 59-69, 2019.
[3] Y. Bodein, B. Rose and E. Caillaud, “Explict reference modeling methodology in parametric CAD system,” Computer-Aided Design, Vol. 65, No.1, pp. 136-147, 2014.
[4] J. D. Camba, M. Contero and P. Company, “Parametric CAD modeling: An analysis of strategies for design reusability,” Computer-Aided Design, Vol. 74, pp. 18-31, 2016.
[5] J. D. Camba and M. Contero, “Assessing the impact of geometric design intent annotations on parametric model alteration activities,” Computer in Industry, Vol. 71, pp. 35-45, 2015.
[6] L. Wang, J. Y. Zhang, W. Yang and Q. Fan, “Advantages analysis of synchronous modeling technology based on solid edge,” WESEAS Transactions on Computers, Vol. 14, pp. 246-252, 2015.
[7] W. F. Gaughran, “Cognitive modelling for engineers,” Proceedings of the 2002 American Society for Engineering Education Annual Conference and Exposition, 2002.
[8] M. W. Fu, S. K. Ong, W. F. Lu, I. B. H. Lee and A. Y. C. Nee, “An approach to identify design and manufacturing features from a data exchanged part model,” Computer-Aided Design, Vol. 35, No. 11, pp. 979-993, 2013.
[9] J. Bai, H. Luo and F. Qin, “Design pattern modeling and extraction for CAD models,” Advances in Engineering Software, Vol. 93, pp. 30-43, 2016.
103
[10]A. Geromin, L. Roucoules, F. Malburet and C. Lopez, “CAD modelling based on knowledge synthesis for design rational,” Procedia CIRP, Vol. 70, pp. 156-161, 2018.
[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

指導教授

賴景義(Jiing-Yih Lai)

審核日期

2018-12-5

推文