机械零件3D网格模型的特征识别研究

发布时间：2018-12-16 12:39

【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。
[Abstract]:A feature recognition method based on feature line is proposed for 3D mesh model of mechanical parts in order to find a feature recognition method which is closely combined with the parameterization of the model. The closed characteristic line is extracted by dihedral angle threshold, the angle of each characteristic line is calculated and the shape of characteristic line is judged, the concave convexity of characteristic line and the cross product of each characteristic line are calculated to determine the character of characteristic line: surface characteristic, inner and outer ring; The model is segmented, the curvature of vertex is calculated, and the type of region is judged. Based on the information of feature line and the attribute of mechanical part, the common features of basic body and mechanical part, such as hole feature and slot feature, are identified. The feasibility of the method is verified by an example, and the method is closely combined with the parameterization of the model, which provides a certain reference for the realization of automatic feature recognition of mechanical parts and parameterization of the model.
【作者单位】：江苏大学机械工程学院;
【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)
【分类号】：TH16;TP391.7

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