Fault diagnosis method based on signed directed graph and data constitution
A technology of symbolic directed graph and data reconstruction, applied in the direction of electrical testing/monitoring, etc., can solve the problems of difficult detection, transfer, and failure to take into account the problem of fault propagation, and achieve the effect of good diagnosis effect.
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[0027] A fault diagnosis method based on symbolic directed graph and data reconstruction. Normal data is collected for offline training as known state measurement data, that is, the preprocessed data is decomposed by PCA, and the control limit of SPE is obtained. . Then, according to the system flow diagram, the SDG model is established, and the parameters of each variable V-mask are determined after setting the false alarm rate, the false alarm rate, and the detection offset. Then collect the process data of the unknown state of the system in real time, as the measurement data of the unknown state, monitor the CUSUM and sample SPE of each variable. If the SPE exceeds the control limit, it means that the system has malfunctioned. Then, the effective node is determined through the CUSUM statistics. Search all possible compatible paths and reconstruct the data in all compatible path directions. The direction with the largest fault isolation index is the true fault propagation dir...
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