中文摘要：

在基于特征的CAD／CAM／CAE集成研究中，构建CAD特征模型拓扑元素的父子关系对于快速获取相关信息十分重要．针对现有拓扑元素命名机制不健全，且构建一套拓扑元素命名机制费时、费力，使得不易识别拓扑元素的父子关系的问题，提出一种从简单到复杂，逐步缩小搜索范围以识别拓扑元素父子关系的方法．以点、边、面为判别顺序，先比较拓扑元素的拓扑元素编号、类型、包围盒和边界初步过滤不可能存在父子关系的拓扑元素；然后利用拓扑元素的几何信息精确地识别拓扑元素的父子关系．实验结果证明，文中方法能有效地判别CAD特征模型中拓扑元素的父子关系，进而支持cAD模型信息的快速访问．

英文摘要：

In the integration research of CAD/CAM/CAE, it is important to rapidly access and obtain the relevant information of CAD models by constructing the parent-child relationships among the topological elements of the feature-based CAD models. However, deriving the parent-child relationships is baffled by the imperfectness of the current generic naming mechanisms, which will be built laboriously. A solution to this problem is presented by going from the easy to the complicated, which reduces the search scope step by step. The parent-child relationships are constructed in the order of vertices, edges and faces. The topological elements without the parent-child relationships can be firstly filtered out by the comparison of the topological elements＇ types, bounding boxes and boundaries. The parent-child relationships can be finally determined by exactly comparing the geometric information of topological elements. Experiments show that the method can efficiently recognize the parent-child relationships of the topological elements in the feature-based CAD models and also offers a way to rapidly access the information of CAD models.