Abstract: In view of the dispersive, closed, heterogeneous knowledge, system and resource of fault diagnosis of the aviation-repair-
industry enterprises in different roles, which causes uneasy sharing and reusing problems of fault knowledge, it uses ontology to construct a fault diagnosis knowledge base. In order to express the uncertainty relation between fault phenomenon and fault conclusion, a ontology model structure is built. It designs the corresponding inference rules, and puts forward an uncertainty reasoning system based on ontology. In aircraft engine fault diagnosis the method is verified.

Key words: ontology, uncertainty reasoning, fault diagnosis, Jena

摘要： 针对航空维修行业内不同角色企业故障诊断知识、系统、资源的分散、封闭、异构等原因导致的故障知识不易共享、重用的问题，采用本体来构建故障知识库；并设计其本体知识模型结构，以表达故障现象与故障结论间存在的不确定性关系；进一步编写相应的推理规则，设计基于本体的不确定性推理系统。以飞机发动机故障诊断为例进行了验证。

关键词: 本体, 不确定性推理, 故障诊断, Jena