关键词: 工程图样, 智能理解, 关系模型, 表达方式, 投影关系, 尺寸约束

Abstract: This paper proposes the relation model which made up of a relation graph of views including "one graph, one tree, two lists", a dimension tree, a relation list of geometry element projection and a graphic list of dimension restriction. The relation model is built on three lays: the processing of expression mode, the processing of projection relation and the processing of dimension restriction. Based on the view partition, dimension departing and the reference frame building, the processing of expression mode mainly resolves the view recognizing and the building of the relation graphs of views. The processing of projection relation mainly resolves the cutting and connecting of elements and the building of the relation list of geometry element projection. The processing of dimension restriction mainly resolves the building of the dimension tree and the graphic list of dimension restriction. All of the actions are to make technique preparations for the intellective comprehend facing to engineering drawings.

Key words: engineering drawings, intelligent comprehension, relation model, expression mode, projection relation, dimension restriction