论文部分内容阅读
针对复杂的多故障诊断问题以及多故障直接处理算法实现的难点,本文在测试性D矩阵基础上,提出了一种基于单故障化的多故障诊断与维修新策略(Multiple Fault Diagnosis and Maintenance Strategy by Translating into Single-fault,MFDMSTS)。首先在多故障假设下引入析取运算,定义了可隔离单故障和可隔离多故障,据此定义将多故障转化为单故障,并将转化的单故障与测试集组成新的D矩阵;然后运用单故障诊断算法处理新的D矩阵,得到最优诊断树;最后针对诊断树的不同叶子节点,提出了多故障诊断维修策略。实例验算表明MFDMSTS能降低平均诊断费用和平均诊断步数,并大幅降低误修率。
In order to solve the complex multi-fault diagnosis problem and the difficulty of multi-fault direct processing algorithm, this paper proposes a new fault diagnosis and maintenance strategy based on test D matrix (Multiple Fault Diagnosis and Maintenance Strategy by Translating into Single-fault, MFDMSTS). Firstly, the disjunctive operation is introduced under the assumption of multiple faults, which defines the isolation of single faults and the isolation of multiple faults. According to this definition, multiple faults are transformed into single faults and the transformed single faults and test sets form a new D matrix. Then, A single fault diagnosis algorithm is used to process the new D matrix to get the optimal diagnosis tree. Finally, aiming at different leaf nodes of the diagnosis tree, a multi-fault diagnosis and maintenance strategy is proposed. Case studies show that MFDMSTS can reduce the average diagnostic cost and the average number of diagnostic steps, and drastically reduce the error repair rate.