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With the development of science and technology , the design of the spacecraft must require the ability to have the fault detection and diagnosis , this is an important issue can not be ignored in the design of spacecraft . Spacecraft on its features , including task management, health management and payload operations three main areas , including fault diagnosis is one of the important functions of the control system of the spacecraft . This paper first introduces the basic concepts of the fault tree , and focuses on the fault tree analysis , the establishment of the fault tree fault tree analysis , pre-processing of the fault tree , the qualitative and quantitative analysis of the fault tree to conduct a detailed study . Second elaborate on the basic principle of the rule-based diagnostic expert system , the composition and functions of the various parts . Proposed method of combining the fault tree analysis and rule-based diagnostic expert system , Fault Tree Diagnosis Expert System Knowledge Base link , comprehensive system , the level of expert knowledge represented diagnostic knowledge acquisition and to ensure the consistency and completeness of diagnostic knowledge . Again, the inference mechanism , which is the focus of the expert system . Fault diagnosis , if you do not have a good reasoning rules all events that may lead to failure 11 test will result in low efficiency and consumption . Qualitative and quantitative analysis , the article uses ITEM fault tree fault tree and fault tree based on the idea of minimal cut sets importance degree , which can greatly increase the probability of a hit , and reduce the number of blind tests applied to the expert system inference mechanism . Finally, windows XP platform , VC programming language , SQL2000 back-end database , the application of artificial intelligence diagnostic methods and object-oriented programming method , developed spacecraft attitude control engine fault diagnosis expert system , this method is verified good prospect .
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