Research on Engineering Semantics Extraction Technology for Engineering Drawings Understanding
面向图样理解的工程语义获取技术研究

This paper is concerned with the problem of intelligent understanding of engineering drawing. The presented method is based on the engineering semantics classification. The contribution of different kind of semantics and the relationships among them in engineering drawings understanding are firstly discussed, namely, expression mode semantics is the premise, projection relation semantics is the kernel and dimension constraint semantics is the elicitation. Then the technology of engineering semantics obtaining and the corresponding integration are mainly introduced, thus the functional semantics expressed through the engineering semantics information could be obtained. In the end, complete details are provided to illustrate the identification of simple features and the combined relationship among the primitives using this approach. This method has been successfully used in the prototype system and the expected results have been got. It shows that the drawing understanding could be simplified, the recognition and processing could be speed up, and furthermore, the understanding reliability could be enhanced by using the technology.