基于专家系统的导弹发射车液压系统故障诊断

Fault Diagnosis Expert System for Hydraulic System of Missile Launcher

液压系统为导弹发射车提供动力源,该系统运行的可靠性在不同程度上影响着导弹发射车的工作性能。针对导弹发射车液压系统故障知识的特点,提出了将领域专家经验分解成故障现象、故障原因和故障规则的知识表达方式,设计了由故障现象、故障原因分别构成故障规则前件和后件的知识获取方法,实现了故障知识的有效管理和维护。针对故障诊断流程图的结构特点,提出了故障诊断二叉树的概念,给出了将诊断流程图转化成故障诊断二叉树的方法,并在此基础上设计了基于故障诊断二叉树的故障推理机和基于二叉树前序遍历的故障解释机制。实践表明该专家系统的设计方法及原理具有一定实用性和通用性,对同类系统的设计具有很好的借鉴作用。

The hydraulic system is a power source of a missile launcher, and its reliability decides the working performance of the launcher. Based on the characteristics of the knowledge of the hydraulic system＇s failures, a new way to express the expert＇s knowledge in this field which is to divide the knowledge into failure phenomena, failure causes and failure rules is put forward. A method to acquire knowledge of failures is also designed. In this method, the before and after components of a failure rule are constituted respectively by failure phenomena and causes, and the effective organization and maintenance of the failur^knowledge＇s databases are actualized. As for the structure of the fault-diagnosis flow chart, a new concept, which converts the flow chart to a fault-diagnosis binary tree, is presented. According to this idea, the fault inference engine and the interpretation machine with preorder traversal algorithm of the binary tree are achieved. The results show that these methods and principles to design the expert system have practicability and universality, and can be used as references for designing other expert systems.