逆向工程中基于几何约束的汽车零部件模型重建  

Automobile Part Model Reconstruction Based on Geometric Constraints in Reverse Engineering

作　　者：郑椰琴[1] 杨文玉[1] 

机构地区：[1]华中科技大学,武汉430074

出　　处：《中国机械工程》2007年第20期2506-2509,共4页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50335020);国家重点基础研究发展计划资助项目(2006CB705400)

摘　　要：结合汽车变速箱、发动机零部件的精密测量和数字建模,考虑零部件实物模型中的隐含约束关系,提出了基于几何约束的模型重建和优化求解方法。该方法把约束按照优先等级顺序添加到约束图中,应用自由度分析法建立协调的约束系统,把复杂约束问题分解为约束子问题进行求解。将该方法应用于变速箱零部件模型重建中,所得到的几何模型较好地反映了原始设计意图,满足产品装配精度要求。This paper comes from a project of precision measurement and digital modeling of automobile engine and transmission system. The underlying constraint relationship among the features of mated parts was taken into account in reconstruction process, and a new optimization reconstruction method was presented based on geometric constraints, which were expressed by geometric constraint graphs. Adding constraints to constraint graphs by priority, considering degree of freedom to obtain a consistent constraint system and finally the complicated constraint problems were decomposed into sub-problems to be solved. The approach was demonstrated by the practical parts from an automobile transmission system. The obtained geometric models are conformed to original design intents in geometric features and ensure assembly precision.

关 键 词：模型重建 几何约束 约束协调 自由度分析法 

分 类 号：TH391.72[机械工程—机械制造及自动化] TH16