面向离散模型的B-rep构建、特征简化及网格生成方法  

B-rep construction,defeaturing and meshing algorithms for discretized models

作　　者：郭宇飞 孙科武 赵荣利 王英雷 陈元培 王智斌 GUO Yufei;SUN Kewu;ZHAO Rongli;WANG Yinglei;CHEN Yuanpei;WANG Zhibin(Intelligent Science&Technology Academy of CASIC,Beijing 100043,China;Key Lab of Aerospace Defense Intelligent System and Technology,Beijing 100043,China)

机构地区：[1]航天科工集团智能科技研究院,北京100043 [2]航天防务智能系统与技术科研重点实验室,北京100043

出　　处：《中国科技论文》2023年第4期449-454,共6页China Sciencepaper

基　　金：国家自然科学基金资助项目(12202412)。

摘　　要：由逆向工程得到的离散模型网格质量较差,缺乏几何信息,且包含大量细小特征,通常不能直接用于有限元分析。面向离散模型的高质量曲面网格生成,提出了一套构建离散模型的边界表征(boundary representation,B-rep)算法,并在此基础上实现了特征简化和网格生成。首先识别离散模型的特征信息,并以此构建离散模型的B-rep表达;随后自动识别模型中不必要的特征,并通过虚操作予以消除;最后基于球填充算法和加点/删点方法生成高质量的网格。实验结果验证了所提算法的有效性和实用性。The discretized models generated by reverse engineering usually cannot be directly applied to analyze due to poor quality,lacking geometric information and including a number of small features.To generate high-quality surface mesh on discretized models,an automatic approach was proposed to construct boundary representation(B-rep) information and remove the unnecessary features,followed with a surface mesh generation method for the defeatured models.Specifically,first the vertices,edges,and faces of discretized models were recognized and the B-rep information based on these features was constructed.Then the unnecessary features were removed by virtual operations.Finally,a surface mesh was generated on the discretized model based on a ball-packing method and a node addition/deletion method.Some numerical result demonstrate the effectiveness and validity of the proposed approach.

关 键 词：特征识别 特征简化 网格生成 边界表征 离散模型 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]