The Design Of The Civil Aircraft's Fault Diagnosing System

In China, compared with the Airlines fleet size and the business volume, the development of civil aviation locomotive maintenance show much more hysteresis . At present our civil aircraft maintenance based on components complete theory as a foundation of regular maintenance. Instead of condition-based maintenance which is based on monitoring equipment technical status. Because of the abstractness and discontinuity of experience, aircraft maintenance work has still stayed in the original "master" mode and "ChuanBangDai" traditional working mode. At the same time, because of the experience of storage, and cannot be shared, while the experts is going to be retired, some part of the experience and data is becoming extinct. Therefore the experience of civil aviation maintenance systems can't spirals up into the high level. It dramatically limits the Chinese civil aviation maintenance technology development and progress of enterprises. In such circumstances, this paper makes following research to civil aviation maintenance fault diagnosis:1.Through to making the summary of the civil aviation maintenance enterprises for aircraft troubleshooting process, it obtained the expressions of the civil aircraft fault diagnosis process and civil aviation maintenance field experience. And it made a simple classification of the failure, which the civil aircraft maintenance enterprises are facing. On the Basis of the combination of the experience and the manual, it suggested a intelligent fault diagnosis system, which is given priority to CRB and fault tree analysis. Use of the case for the same reasoning skills will speed up the case of a search speed and matching. When the fault case will match out in the Case Library, the system can diagnose the fault by the fault tree analysis.2.Because CBR technology is closely related with the knowledge representation, there are different ways in the different areas. Reasoning based on the case for the practical application has been minutely dissected with civil aircraft maintenance field in this article. And it prevailingly analysed preservation forms of relevant cases in the database, case feature expression and all kinds of case classification method and database storage structure. On this basis, this paper analyses the case search and examples about matching algorithms. It put forward based on key character comparison algorithm and matching algorithm. Finally it completed intelligent fault diagnosis system diagnostic algorithm.3.To ensure that the fault diagnosis system in aircraft fault diagnosis on the comprehensive as possible, In this paper, based on case reasoning technique in the foundation, the union based on fault tree analysis method of system and supplement. it mainly discussed the database technology in fault tree structure form and preserving in database based on fault tree traversing algorithm is discussed.4.Based on the above all kinds of algorithms, and on the basis of using VB6.0 programming languages and SQL database system for Service 2000 putted forward and fault tree of database construction. Through OBV and VBA technology, the VB program the database accesses, by VB "what you see is what you get" complete program mainly the man-machine interface design. Finally through debugging experiment complete program, this article to verify the accuracy of the fundamental algorithm and a match and reliability.