因果图定性分析法及其在故障诊断中的应用

Qualitative Analysis of Causal Diagram and Its Application in Fault Diagnosis

在故障诊断中经常用到因果图分析法,因果图理论是基于信度网(Belief Network)[1]上发展起来的,因其完全基于概率论,具有良好的理论基础,对于网络的拓扑结构也没有限制,所以得到了广泛的应用,如故障诊断;定性分析法在故障诊断中有广泛的应用,具体方法有结构重要度系数法、概率重要度以及关键重要度法,主要介绍结构重要度系数法定性分析故障原因,进而采取预防措施。

Causal diagram analysis is often used in fault diagnosis. Developed from brief network[1],totally based on probability theory,the causal diagram theory with good theoretical basis is a wide range of applications,such as fault diagnosis for there is no limit to network topology. Qualitative analysis is widely applied in fault diagnosis,and specific methods include structure importance coefficient method,the probability of importance and critical degree method. This paper analyzes the cause of fault by structure importance coefficient method,and then takes preventive measures.