航空瞄准具故障诊断专家系统中知识的处理方法

Study on Disposing Method of Knowledge in Fault Diagnosis Expert System of Aeronautic Gunsight

针对航空瞄准具故障诊断专家系统中知识的获取、表达和推理方法等问题进行研究;首先根据瞄准具的结构特点建立了层次诊断模型,并根据模型在系统中采用了故障树分析法;然后着重讨论了系统中知识的表达、推理和模糊推理等问题的处理方法;通过在系统中建立层次结构的综合数据库及采用产生式规则,有利于诊断知识的获取和表达;采用全局择优搜索法、双向推理和模糊推理,大大提高了推理的效率;该方法的应用为瞄准具故障诊断专家系统的开发和完善提供了有力的技术支持。

The obtaining method, expressing method and inference method of knowledge in the fault diagnosis expert system of the aero nautic gunsight is studied. Firstly, the layered diagnosis model of the aeronautic gunsight is established through the analysis of the structure of the gunsight and the fault tree analysis method is usedby the model in the system. Then, the expression of the knowledge, consequence method and fuzzy consequence method in the fault diagnosis expert system are analyzed in detail. It is propitious to obtain and express diagno sis knowledge that the layered competitive database is established and the produce formula rule is adopted in the system. The consequence efficiency is advanced greatly by adopting the search method that chooses the best one in overall situation, bidirection reasoning and fuzzy consequence. This method offered powerful tech support to develop and perfect the fault diagnose expert system.