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| 研究生： |
黃駿 Chun Wong |
|---|---|
| 論文名稱： |
以B-rep為基礎之圓角特徵簡化技術發展 |
| 指導教授： |
賴景義
Jiing-jih 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： | 2014 |
| 畢業學年度： | 102 |
| 語文別： | 中文 |
| 論文頁數： | 80 |
| 中文關鍵詞： | 特徵簡化 、B-rep 、圓角 |
| 相關次數： | 點閱：15 下載：0 |
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因應塑膠產品需求的日益升高，需在製造前經過電腦的模擬分析。而建構模型的網格時經常因模型的細小特徵，建構出品質不佳的網格，為了提升品質需以人工的方式逐一調整網格，因而浪費大量的時間。為了減少人工調整之花費時間，本研究將簡化模型中的圓角特徵，以降低模型的複雜程度，藉此提升網格的品質。本研究以了解模型的B-rep資料結構為基礎，擷取圓角的周邊資訊，以此推算簡化後的形狀，並改變其拓撲與幾何資料，以達到簡化之目的。對於圓角簡化後的結果，本研究以商業軟體CADdoctor作為驗證的依據，以得到正確之簡化結果。
In response to the increasing requirement for plastic products, the design should be analyzed before manufacturing through appropriate computer aided engineering technology. In CAE analysis, meshes with bad quality appear quite often owing to the existing of tiny features on the CAD model. To improve the quality of the analysis, the meshes need to be adjusted one by one, which requires significant manual efforts. In order to reduce the efforts of adjusting meshes manually, the aim of this study is to present a method for the simplification of fillets. By simplifying the fillets, the complexity of the model can be reduced and hence the quality of the meshes can be improved. This study is based on the understanding the B-rep model. It captures the information with respect to a fillet, and calculates the simplified shape of it. By changing the topological and geometric data near the elements on the fillet, the fillet can be simplified. The CADdoctor is employed and compared with the proposed algorithm to verify the feasibility of the proposed method.
[1] G. Kós, R. R. Martin and T. Várady, “Methods to recover constant radius rolling ball blends in reverse engineering”, Computer Aided Geometric Design, Vol. 17, No. 2, pp. 127-160, February 2000.
[2]I. C. Braid, “Non-local blending of boundary models”, Computer-Aided Design, Vol. 29, No. 2, pp. 89-100, February 1997.
[3] H. Zhu and C.H. Menq, “BRep model simplification by automatic fillet round suppressing for efficient automatic feature recognition”, Computer-Aided Design, Vol. 34, No. 2, pp. 109-123, February 2002.
[4] H. Mounir, A. Nizar and B. Abdelmajid, “CAD model simplification using a removing details and merging faces technique”, Journal of Mechanical Science and Technology, Vol. 26, No. 11, pp. 3539-3548, November 2012.
[5] S. Venkataraman, M. Sohoni and R. Rajadhyaksha, “Removal of blends from boundary representation models”, Proceedings of the seventh ACM symposium on Solid modeling and applications, pp. 83-94, 2002.
[6] X. Cui, S. Gao and G. Zhou, “An Efficient Algorithm for Recognizing and Suppressing Blend Features”, Computer-Aided Design and Applications, Vol. 1, No. 1-4, pp. 421-428, 2004.
[7] N. Joshi and D. Dutta, “Feature Simplification Techniques for Freeform Surface Models”, Journal of Computing and Information Science in Engineering, Vol. 3, No. 3, pp. 177-186, 2003.
[8] S. Venkataraman and M. Sohoni, “Blend Recognition Algorithm and Applications”, The sixth ACM Symposium on Solid Modeling and Applications, pp.99-108, 2001.
[9] B. Li and J. Liu, “Detail Feature Recognition and Decomposition in Solid Model”, Computer-Aided Design, Vol. 34, No. 5, pp. 405-414, 2002.
[10] S. Kim, K. Lee, T. Hong, M. Kim, M. Jung and Y. Song, “An integrated approach to realize multi-resolution of B-rep model”, ACM Symposium on Solid Modeling and Applications, pp. 153-162, 2005.
[11] Rhinoceros, Available at: http://www.rhino3d.com/, Accessed 14 July 2014.
[12] McNeel Wiki, Available at: http://wiki.mcneel.com/homepage, Accessed 14 July 2014.
[13] 游子威，以B-rep為基礎之混接曲面辨識技術發展，國立中央大學機械工學系碩士班論文，2014.
[14] GrabCAD, Available at: https://grabcad.com/, Accessed 14 July 2014.
