EEMD (Ensemble Empirical Mode Decomposition) and HMM (Hidden Markov Model) based analog circuit intermittent fault diagnosis method

Abstract

The invention discloses an EEMD (Ensemble Empirical Mode Decomposition) and HMM (Hidden Markov Model) based analog circuit intermittent fault diagnosis method. The specific steps of the method are asfollows: manufacturing a same analog circuit for testing according to the existing analog circuit system, obtaining a key node on a test circuit through sensitivity analysis, and installing a relay for the key node, wherein the closing frequency of the relay is set to two modes: a fixed frequency for simulating the periodic intermittent fault and a random closing frequency for simulating the random intermittent fault. The operation state of the intermittent fault of the circuit system is simulated by controlling the intermittent closing of the key-node relay, so that sample data of the test circuit are obtained, the EEMD processing and the feature extraction are conducted on the acquired sample data to construct an energy feature matrix, the different states of HMMs are trained by using the feature matrix, the well trained HMM is used to identify and classify the acquired signal data of the existing analog circuit, and the fault type of the signal of the existing analog circuit systemis efficiently accurately identified.

Description

technical field [0001] The invention relates to the technical field of intermittent fault diagnosis of analog circuits, in particular to a method for diagnosing intermittent faults of analog circuits based on EEMD and HMM. Background technique [0002] Intermittent failure of the electrical system refers to a failure that lasts for a limited period of time, without any corrective maintenance activities, and then restores its ability to perform the required function by itself. Intermittent failure is an intermittent, unpredictable physical phenomenon that appears and disappears randomly. Repeated appearance and disappearance are mainly caused by internal system defects (unstable hardware and software), and whether it occurs or not depends on certain specific system conditions. During the active period of intermittent faults, the system will produce wrong results; when intermittent faults are inactive, the system will output correct results, and the cause of the fault is usua...

AI Technical Summary

Problems solved by technology

[0004] Each integrated circuit contains thousands of electronic components, and each electronic component may fail, resulting in intermittent failure of the entire circuit

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