基于可拓规则推理的故障诊断方法

针对产生式规则推理方法存在的推理效率低、知识获取困难以及难以用于多故障诊断等问题,研究基于可拓规则推理的故障诊断方法。首先将基元理论和产生式规则相结合,得到可拓规则的基元表示;然后给出可拓规则匹配度计算公式,并提出按前件基元类型和属性数据类型不同对可拓规则进行分层匹配,对所有匹配成功的可拓规则,提出先删减再排序的冲突消解策略,在算法分析中讨论可拓规则推理的时间复杂度;最后通过应用案例说明可拓规则表示、匹配、推理和冲突消解的全过程,结果表明该方法适用于机载设备的多故障诊断。 

Fault diagnosis method based on extension rule-based reasoning

Aimed at low inference efficiency, difficult knowledge acquisition and unsuitability for multi-fault diagnosis in production rule reasoning method, the fault diagnosis method based on extension rule-based reasoning is studied. Firstly, the expression of extension rule is obtained by combining basic-element theory with production rule. Secondly, the matching degree formula of extension rules is given, and the hierarchical matching method according to the difference of antecedent mode and data type is proposed. Furthermore, the conflict resolution strategy of "first cut, then sort" is put forward for all extension rules which are matched successfully, and the time complexity of this method is discussed. Finally, the whole process of expression, matching, reasoning and conflict resolution for extension rules is explained by an application case, and the results show that this method can be used for the multi-fault diagnosis of airborne equipment.