CAJ | 학술논문

给出一种基于符号有向图相容通路信度动态融合的故障诊断方法. 建立基于趋势分析的SDG模型,当系统发生故障或异常时,根据节点之间的数据及相容规则计算相容通路的信度,并将其转化为相容通路证据. 基于递归的条件化线性组合更新规则,利用当前证据更新历史证据,得到更新后的全局相容通路证据,全局证据中赋值最大的相容通路即为故障传播的路径. 相对于基于趋势分析的SDG故障诊断方法,新方法提高了系统早期故障诊断的可靠性. 文中通过三级液位控制系统的故障仿真实验对其进行验证,说明其可行性和有效性.
급출일충기우부호유향도상용통로신도동태융합적고장진단방법. 건립기우추세분석적SDG모형,당계통발생고장혹이상시,근거절점지간적수거급상용규칙계산상용통로적신도,병장기전화위상용통로증거. 기우체귀적조건화선성조합경신규칙,이용당전증거경신역사증거,득도경신후적전국상용통로증거,전국증거중부치최대적상용통로즉위고장전파적로경. 상대우기우추세분석적SDG고장진단방법,신방법제고료계통조기고장진단적가고성. 문중통과삼급액위공제계통적고장방진실험대기진행험증,설명기가행성화유효성.
This paper presents the fault diagnosis method using dynamic fusion of SDG consistent path belief.A SDG model of system is firstly constructed based on trend analysis.When the faults or abnormal nodes are found out,the beliefs of consistent paths can be obtained by the data of these nodes and compatibility rule, and the consistent path evidence is calculated by normalizing the beliefs.Based on recursive conditional linear updating rule of evidence, the incoming consistent path evidence at t step is used to update the historical consistent path evidence so as to obtain the updated consistent path evidence at t step.The path having the biggest mass of belief is the fault propagation path.Compared with qualitative trend analysis based SDG fault diagnosis,the new method can improve the reliability of early fault diagnosis.This paper shows the effectiveness and feasibility of the proposed method by fault simulation experiment on three-level control system.