Research On Expert System For Fault Diagnosis Of Agricultural Machinery Hydraulic System

Due to the requirements of production, agricultural machinery is equipped with a large number of hydraulic components. Hydraulic components failure occurs frequently, and Once agriculture machinery that often work in remote areas has serious faults, they will not get timely solutions. So it is of great practical significance to study and design fault diagnosis expert system of mechanical hydraulic system. This subject is based on VB6.0 to design and develop the fault diagnosis expert system of agricultural machinery hydraulic system.A profound analysis on the development history and current situation of fault diagnosis expert system of mechanical hydraulic system, points out that the subject of the purpose and significance of the study, and explains the urgency of the development of fault diagnosis expert system of agricultural machinery hydraulic system. This paper briefly introduces the general structure of the fault diagnosis expert system of traditional hydraulic system, analyzes its shortcomings and defects, designs more reasonable knowledge base system, optimizes the inference mechanism, make the man-machine interface and explanation mechanism more humanized, creatively adds voice broadcast, LAN communication, network classroom, online manual service, multimedia service etc..The preparations of various functional interface program by VB6.0 language, including the online manual service, multimedia services and reasoning program. Among them, the realization of the reasoning mechanism is that the user inputs keywords, the system according to the matching keywords in the knowledge base of fault phenomena in the status bar, and the result set is preserved. Then through the user multiple inputs keywords for diagnostic reasoning, it will eventually display matching the conditions of the result set.The knowledge base is designed based on ACCESS database, connected to database through data control provided by VB6.0, and ADO can modify and delete knowledge database records. In addition, database repair function and backup function can stabilize and protect the knowledge base, at the same time, the database analysis functions make the user more comprehensive understanding of the content and structure of knowledge base.In order to serve customers better and more comprehensive, the retrieval method is divided into hydraulic related images retrieval, failure of hydraulic components retrieval and typical mechanical hydraulic fault retrieval, so that even if the primary users or operators can all-around solve their problems encountered.