THE RESEARCH AND DEVELOPMENT OF PIPING FEATURE INTELLIGENT PLACEMENT IN PIPING CAD SYSTEM BASED ON SMARTLINE MODEL

To raise the efficiency of features location in piping CAD system，this paper presents three patterns of pipe lines in plan and section drawing．Smart-line is a kind of component inducted into piping CAD system，and then it is extended to form a model describing pipe-lines．Some methods of heuristic search based on smart-line model are introduced and make it possible to accomplish automatic placement of pipe-line features in local search space．