基于分层模糊符号有向图法的故障诊断方法  

A fault diagnosis approach based on hierarchical fuzzy signed directed graph model

作　　者：赵靓[1] 柴庆龙 

机构地区：[1]太原理工大学信息工程学院,山西太原030024

出　　处：《热力发电》2015年第11期26-31,共6页Thermal Power Generation

基　　金：山西省留学回国人员科技活动择优资助项目(2013-68;2013-69)

摘　　要：故障诊断系统对实时性、准确性和完备性要求较高,为此建立了分层模糊符号有向图(SDG)模型。该模型基于可达性的分层方法,通过建立分层有向图模型达到减少搜索空间、提高故障诊断效率的目的;引入模糊隶属度,对节点的故障发生可能性进行定量描述,达到故障精准定位的要求;根据故障传播路径上节点间的定性关系,确定分层模糊SDG模型相容通路;在发生故障时,对报警节点进行回溯,搜索相容通路,找出故障源备选节点,利用相容性和模糊推理进行诊断,得到各故障源的可能性排序。以田纳西-伊斯曼过程(TEP)系统反应器为对象,采用分层模糊SDG模型进行故障诊断推理,以验证该诊断方法的有效性。结果表明,该故障诊断方法可行,并具有定性诊断的完备性和定量诊断的准确性。The fault diagnosis system requires high quality in real-time,accuracy and completeness.Thus,a hierarchical fuzzy signed directed graph（SDG）model was established.Combining with the technique of layering in the fault diagnosis,this model can reduce the searching space and improve the diagnosis efficiency.The fuzzy membership was introduced to carry out quantitative description on fault possibility and meet the needs of fault accurate positioning.According to the qualitative relationship between nodes at failure propagation paths,the hierarchical fuzzy SDG model compatible pathway can be determined.When a fault occurs,the compatible branch will be searched and the candidate nodes of fault source will be found out.The compatibility and fuzzy-reasoning was applied to finally get the possibility of fault sources in order.At last,the Tennessee Eastman process（TEP）was taken as the object to establish the hierarchical fuzzy SDG model and do fault diagnosis reasoning,thus to verify the effectiveness of this method.The results show that this diagnosis method is feasible and the efficiency and accuracy of fault source searching are improved.

关 键 词：故障诊断 SDG模型 模糊推理 相容通路 搜索效率 TEP系统 

分 类 号：TP206.3[自动化与计算机技术—检测技术与自动化装置]