基于流向图的不完备故障诊断知识表示方法

Knowledge Representation for Incomplete Fault Diagnosis Based on Flow Graphs

现有的故障诊断知识表示方法在故障诊断信息不完备时,都具有一定的缺陷.在Paw-lak所提出的流向图的基础上,研究运用流向图表示不完备故障诊断知识的方法.给出了完备与不完备故障诊断决策流向图的定义,建立了一种适合于包含不完备诊断信息的故障诊断知识的图形化方法,并将隐含于不完备故障诊断决策流向图中的决策规则采用置信度和覆盖度作为评价指标,为后续基于流向图的不完备故障诊断知识的获取奠定了基础.

In view of the disadvantages existing in the current fault-diagnosis-knowledge representation methods due to the incompletion of the fault diagnosis information, a method using flow graph to represent the incomplete fault-diagnosis-knowledge is investigated on the basis of the one proposed by Pawlak. The definitions of complete and incomplete fault-diagnosis-decision-flow-graph is presented. A graphic method applicable for containing incomplete fault-diagnosis-information in the fault-diagnosis-knowledge is established. The confidence and the coverage are employed as the evaluating indicators of decision rules implicit in the incomplete fault-diagnosis-decision-flowgraph, which provides the foundation of fault-diagnosis-knowledge acquisition based on the flow graph. For convenience of explanation, an example for the fault diagnosis of an electronic circuit is given.