面向并行设计的启发式特征识别

Concurrent-Design-Oriented Heuristic Feature Recognition

提出一种利用图结构的启发式特征识别方法，其识别过程包括子图的启发式识别和子图的特征标识两部分。讨论了特征的表达、启发式规则以及用整数和字符表示特征的几何、拓扑、语义等信息的样板特征表达策略，实现了加工特征的识别。

A heuristic feature recognizing algorithm for automatically obtaining the relevant infor-mation from a design system and generating a set of machining features is proposed.The ge-ometric,topological,and semantic information on the design is translated into a neutral rep-resentation in the form of a graph embedded in a structure formed by hash tables and linklists. There are two steps, the first of which is to recognize a specific feature by identifyinga subgraph and the second is to determine the geometric, topological,and semantic charac-teristics of the subgraph.Only one search for the graph is required for the identification ofalI the subgraphs,including curved surfaces. Quick identification of a subgraph is possiblebecause matching of integer and character is adopted instead of the ordinary graph matchingtechnique.