Study On Fault Diagnosis Expert System Based On Petri Net And Its' Application

Petri network and expert system study and it uses to be comparatively active two field at present, Thesis this fault diagnose system start with, combine expert system theory and Petri network theory of Regard some concentration control systems of food production line as background , set up a fault diagnose expert system based on Petri network. The first some of this paper, Introduce fault diagnose system, especially fault diagnose basic theories and Petri basic conception and fuzzy Petri network theory of network of expert system mainly, Give and publish and show with Petri network trouble diagnose model of expert system. Following to launch and describe with basic frame of expert system, one that is with knowledge obtain, application, to maintain three parts combine Petri net knowledge of knowledge, Study fault propagate to obtain model, Petri network reasoning method and trouble diagnose the systematic framework of the expert system separately.Fault propagate model to obtain and combine present prevailing large amount of information, neuron network,etc. method most model, Direct against fuzzy Petri network give and publish undering the jurisdiction of degrees of algorithm of function concrete their; Petri network reasoning method combine trouble tree forward reasoning reverse algorithm of reasoning mainly, The concrete instance of connection is analysed and compares; Participate in potato cake production line background that design with author finally , combine on-the-spot characteristic of equipment, Set up one fault diagnose concrete model of expert system.