An Autopilot Fault Diagnosis Method Based on Hybrid Case and Fault Trees

Abstract

Targeted at the faults of autopilot in fly-by-wire flight control system, a method based on integration of case and fault tree is proposed to quickly diagnose faults and provide the maintenance of autopilot system. In the process of diagnosis, according to the characteristics of fault information about autopilot system, the Build-in-test data was used to quickly search similar fault in the case base and accurately point out the fault location. For complex fault, the fault tree method is used to traverse to complete the reasoning and diagnosis procedure, and simultaneously add the results to the case base. The simulation results show the method is achieved.

Research of CBR-Based Organizations on Aromourd Equipment Fault-Diagnosis

“…The case-based reasoning technology of maintenance and support areas are mostly applied for specific parts, such as Han Yun dong apply the case-based reasoning technology to the diagnosis of autopilot steering instrument fault [1]; or for the not so complex system, such as Su Xian researches the rolling mill fault diagnosis system based on case reasoning [2], Shen Da peng studies the fault diagnosis expert system of reciprocating compressor based on case reasoning, the complexity of the system architecture determines the difficulty degree of the case-warehouse organization [3],therefore the organizations of the case-warehouse are relatively easy under these circumstances, but the relative complex structure of armoured equipment determines the higher demand of case-based organization. In this paper, we apply to analysis fault mode before organizations of the case-warehouse, and obtain the corresponding fault modes, then summarize the fault mode to derive the fault mode category, finally establish a hierarchical tree indexing combining with the tree binding equipment to settle the base of the case retrieval and matching process.…”