摘要
为寻求与模型参数化紧密结合的特征识别方法,针对机械零件3D网格模型,提出了一种基于特征线的特征识别方法。通过二面角阈值的方式提取封闭特征线,计算每两条特征线的夹角并判断特征线形状;对特征线的凹凸性和每两条特征线的叉积进行计算,确定特征线性质:面特性、内外环;对模型进行区域分割处理,计算顶点曲率,判断区域的类型。依据特征线信息与机械零件特征的属性,识别出基本体和机械零件常见特征,如:孔特征、槽特征。通过实例验证了该特征识别方法的可行性,且该方法与模型参数化紧密结合起来,为实现机械零件自动特征识别和模型参数化提供一定的参考。
To find the feature recognition method closely related to model parameterization , an approach based on feature line from 3D mesh models of mechanical parts was proposed. After extracting the closed feature lines based on the threshold, the shape of the feature lines were judged by the angle between the feature edges. To judge surface features, inside and outside ring features, the convexity-concavity and cross product of the feature lines were computed. To judge area type, the model was separated and vertex curvature was calculated .According to the feature lines information and features＇ characteristic, hole feature and slot feature were recognized. The results show that： the feature recognition method based on feature line of 3D mesh model can identify characteristics of the mechanical parts and build the close relationship with model parameterization . The study provide a reference for model pavameterization and feature recognition of mechanical parts.
出处
《机械设计与制造》
北大核心
2017年第6期175-178,共4页
Machinery Design & Manufacture
基金
高等学校博士学科点专项科研基金联合资助课题项目(20113227110007)
江苏大学博士创新计划项目(KYLX15_1050)
江苏省镇江市江苏大学校企合作项目(1821110105)
关键词
机械零件
特征识别
特征线
参数化建模
三维网格
Mechanical Parts
Feature Recognition
Feature Line
Parametric Modeling
3D Mesh Models
