基于测试性D矩阵的多故障诊断与维修策略

针对复杂的多故障诊断问题以及多故障直接处理方法实现的难点，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策略（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，提出了多故障诊断与维修策略。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。

Multiple fault diagnosis and maintenance strategy based on testability D matrix

In view of the complicated multiple fault diagnosis problems and difficulties in the realization of multiple fault direct processing algorithm,on the basis of testability D matrix and single fault algorithm,a no-vel multiple fault diagnosis and maintenance strategy based on translating into single fault(MFDMSTS)is in-troduced.Firstly, under the assumption of multiple faults, disjunctive operation is introduced, and isolable single fault and isolable multiple faults are defined.According to the definitions,single fault,which composes a new D matrix with test set,is translated into from multiple faults.Secondly,single fault diagnosis algorithm is used to process the new D matrix, and the optimal diagnostic tree is obtained.Finally, a further multiple fault diagnosis and maintenance strategy is proposed for different leaf nodes in the diagnostic tree.Experimen-tal verification demonstrates that MFDMSTS is an effective way to reduce average diagnostic cost and average diagnostic steps,and to greatly reduce the rate of maintenance error.