摘要
提出一种基于结构相似的零件工程图检索方法。将零件工程图中的几何图形标记为功能表面,根据是否共边、共点或点在边上判断功能表面是否拓扑相连,并进一步确定功能表面间的位置关系,生成零件2D结构模型。通过对视图结构模型公共顶点、公共边约束定义的'并'运算,构造零件3D结构模型。借鉴化学数据库中化合物的线性符号表示法生成零件工程图结构码。以零件工程图子结构布尔模型表达检索要求,通过查询子结构码与分支结构码的匹配,实现零件工程图的子结构检索;以零件工程图表达检索要求,通过视图结构码的整体匹配,实现零件工程图的示例检索,通过零件工程图3D结构码与零件三维模型结构码的匹配,实现零件工程图的模型检索,并讨论零件工程图结构检索的关键算法。
A part engineering drawing retrieval method based on structure similarity is proposed.The geometric graph of part engineering drawing is labeled as functional surface.The functional surface which is attached topologically is determined according to the fact that whether they are in the common edge,or whether they have concurrent or point in the edge,and further the position relationship between functional surfaces is decided.Finally 2D structure model of part is generated.The constraints of common vertexes and common edges among view structure models are merged to generate 3D structure model of part.By referring to the linear symbolic notation for compounds in chemical database,a structure coding method is presented.The substructure Boolean model of part engineering drawing is used to express retrieval requirement,the substructure retrieval is realized via matching of query substructure code and branch structure code.The part engineering drawing is used to express retrieval requirement,the example retrieval is realized via matching of view structure code,the model retrieval is realized via 3D structure code matching of part engineering drawing and part 3D model.Finally the key algorithm of part engineering drawing structure retrieval is introduced.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2011年第20期191-198,共8页
Journal of Mechanical Engineering
基金
国家自然科学基金(50945051)
浙江省教育厅(Y200805579)资助项目
关键词
结构模型
零件工程图
相似零件查找
Structure model Part engineering drawing Similar part retrieval
