CAD實體模型之整體與局部圓角簡化技術發展;Development of Overall/Local Fillets Simplification Algorithm for CAD Model

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题名:	CAD實體模型之整體與局部圓角簡化技術發展;Development of Overall/Local Fillets Simplification Algorithm for CAD Model
作者:	林子傑;Lin,Tzu-Chieh
贡献者:	機械工程學系
关键词:	特徵簡化;邊界表示法;圓角;微小特徵;feature simplification;B-rep;fillet;blend face;subtle features
日期:	2016-08-02
上传时间:	2016-10-13 14:54:38 (UTC+8)
出版者:	國立中央大學
摘要:	CAD(Computer-Aided Design)實體模型之特徵簡化技術被廣泛使用於CAE (Computer-Aided Engineering)分析之相關作業。執行CAE分析時需以CAD模型幾何外觀建立分析網格，而模型中細小特徵容易產生劣質的分析網格，進而導致CAE分析結果不夠精確，因此若能簡化模型中細小特徵，有助於提升CAE分析之精準度。其中導角半徑較小之圓角為常見的細小特徵，因此本研究擬發展整體與局部圓角簡化技術，以修正CAD模型之B-rep(Boundary representation)資料結構的方法，建立簡化圓角後之尖銳邊與刪除圓角資訊，以便達到簡化目的。藉由此技術可避免劣質分析網格產生，以提升後續CAE分析之正確性。最後本研究將以40個實際CAD模型進行案例驗證，且獲得良好之測試成功率，以證實本研究具有一定程度之正確性與可行性。;Feature simplification technics can be extensively used in CAE (Computer-Aided Engineering) analysis. In CAE analysis, the need of building up analysis meshes by CAD (Computer-Aided Design) model geometric appearance is indispensable, and subtle features in the model are prone to generate poor quality of analysis meshes which led to CAE analysis of results inaccurate, therefore, simplifying subtle features in the model contributes to CAE analysis accuracy. Fillets which have small radius are common subtle features, hence this thesis intends to modify B-rep(Boundary representation) data of CAD model in order to suppress fillet features which have small radius in the model, thereby avoiding producing poor quality of analysis meshes and improving subsequent CAE analysis accuracy. More than 40 realistic CAD models were tested, and almost all of the fillets on these models were simplified successfully, which can verify the feasibility of the proposed method.
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