某装备吊机液压故障诊断专家系统设计

Design of Hydraulic Fault Diagnosis Expert System for a Equipment Crane

装备液压系统快速故障诊断是维修保障人员亟待解决的难题。以某装备吊机液压系统故障诊断为研究对象,梳理历年故障案例库,运用故障树解析故障原因、逻辑及耦合关系,明确故障产生的全部最小割集。将故障树与专家系统有机结合,依据故障规则构建基于故障树的专家知识库,选用自上而下正向查找方式的推理机制,融合概念图知识匹配模式,设计模糊含权概念图的投影匹配算法。在VB环境下实现专家系统软件功能,使系统具备知识库持续升级、用户故障定位查询、故障排除指导、历史故障记录、诊断报告生成等功能,有效指导维修保障人员进行装备液压系统的故障诊断与排除,并可推广至其他型号、类型的装备液压系统故障诊断中。

Rapid fault diagnosis of equipment hydraulic system is an urgent problem for maintenance support personnel.Taking the fault diagnosis of the hydraulic system of a equipment crane as the research object,this paper sorts out the fault cases over the years,analyzes the fault causes,logic and coupling relationship by using the FTA,and make clear all the minimum cut set caused by the fault.The fault tree is organically combined with the expert system,the expert knowledge base based on the fault tree is constructed according to the fault rules.The inference mechanism of top-down forward search mode is selected,Matching patterns with concept map knowledge,PMFCGw algorithm is designed.In VB environment,expert system software functions are realized and the system has advantages that the knowledge base continues to upgrade,the user fault location query,troubleshooting guide,historical records,trouble diagnosis report generation and so on,effectively guide the maintenance support personnel equipment hydraulic system failure diagnosis and elimination,and can be extended to other types,type of equipment fault diagnosis of hydraulic system.