基于T-Spline的全自动几何拓扑修复方法  

An Automatic Topology Recovery Method Using T-Spline

作　　者：池宝涛 张见明[1,2] 鞠传明 CHI Bao-Tao;ZHANG Jian-Ming;JU Chuan-Ming(College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082;State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082)

机构地区：[1]湖南大学机械与运载工程学院,长沙410082 [2]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082

出　　处：《自动化学报》2019年第8期1511-1526,共16页Acta Automatica Sinica

摘　　要：从高质量曲面网格生成的需求出发,提出了一种基于 T-Spline 的全自动几何拓扑修复方法.本文方法创新性主要可归纳为: 1)对原有计算机辅助设计(Computer aided design, CAD)几何模型不进行任何修改保留其本真,自动识别 CAD 几何模型中常见不必要的几何特征,成功解决了 CAD 几何模型中存在的几何瑕疵,如短边、窄面、退化边、退化面、非连续光滑边界及尖锐特征等,利用新生成的\虚边"、\虚面"处理几何瑕疵,同时通过虚拓扑重构 CAD 几何模型的 B-Rep;2)开发了一套 CAD/CAE 集成系统,统一了几何模型与计算分析模型,实现计算机辅助工程(Computer aided engineering, CAE)与CAD 两者的无缝集成,所有拓扑修复操作及后续 CAE 分析计算均在同一环境下进行,避免了几何模型在 CAE 与 CAD 系统间进行转换时造成的数据丢失.该方法能够对复杂实体实现全自动几何拓扑修复及网格生成,实验表明,在保证不失真的前提下,修复后的几何模型能够生成质量良好的网格且能降低网格的生成规模,验证了本文方法的实用性和有效性,以满足工程实际分析的需要.An automatic topology recovery method using T-Spline is presented to reconstruct surfaces by virtual operations for handling unwanted geometric features and facilitating mesh generation without modifying the original input computer aided design(CAD) model. Innovations of the method primarily are in two aspects. Firstly, it presents an automatic topology recovery method using T-Spline to identificate and handle unwanted geometric features in solid modeling automatically, such as short edges, small faces, degenerated edges, degenerated faces, fragmentary boundary edges, sharp features, etc. And a valid B-Rep of CAD model is reconstructed using virtual topology. Secondly, in order to make a truly seamless interaction between CAD and computer aided engineering(CAE), a system for CAE analysis is developed to improve the efficiency and accuracy of the simulation. All operations and CAE analysis can be set up directly on the CAD model, thus automatic simulation is possible and geometric simplification is avoided. In CAE analysis, on account of the requirement for automatic simulation of entire process, the method based on T-spline can relieve the burden of mesh generation and promote CAE analysis to some extent.

关 键 词：T-Spline 全自动拓扑修复 虚拓扑 曲线曲面拟合 网格生成 

分 类 号：TP391.7[自动化与计算机技术—计算机应用技术]