Engine Network. Net-based Fault Diagnosis Expert System

The network-based fault diagnosis expert system is one of the key research directions of aero-engine fault diagnosis areas. Because its importance, the network-based fault diagnosis expert technology is becoming an attractive subject to the researchers allover he world. In this dissertation, we develop a new type of .NET-based fault diagnosis expert system based on the study of network-based fault diagnosis system already used, and the research will support the build of the network-based fault diagnosis expert system in our country.The latest .NET technology and fault diagnosis technology are used in this dissertation, and the diagnosis functions and network structure of the aero-engine fault diagnosis expert system is designed. The whole system is divided into three levels: the first layer is monitoring and diagnosis of flying machine layer, the second layer is monitoring and diagnostic center and the third layer is ground expert terminal. The network structure of the fault diagnosis expert system based on the .NET framework which is divided into a three-tier structure: the denote layer , the application logic layer and the data layer. The key technology of the system is researched and implement, including fault diagnosis, fault prognosis, network communications, database and network security technology.Two kinds of optimize methods are used to optimize the grey system, and the fault prognosis function of the Aero-engine rotor is achieved by this method. The network design is implement by ASP.NET software. The fault database and knowledge database is designed by SQL Server2000 software, and the database accessing is implement by ADO.NET software. The network security of the system is discussed and designed in this dissertation.Finally a simulation of the aero-engine rotor fault diagnosis is operated within the LAN network. The result proved that the system is effective and the structure of the system is reliable.