Online intermittent fault detection and diagnosis method

A fault detection and diagnosis method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of complex intermittent fault behavior patterns, difficult detection and diagnosis of intermittent faults, etc., and achieves fast calculation speed and modal aliasing. Weakening, end-effect weakening effects
CN110501631AActive Publication Date: 2019-11-26重庆耐德山花特种车有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
重庆耐德山花特种车有限责任公司
Publication Date
2019-11-26

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Abstract

The invention discloses an online intermittent fault detection and diagnosis method. The method comprises the following steps of (1) acquiring a standard fault data set by using a system to be diagnosed; (2) judging whether singular points exist in a signal through a wavelet modulus maximum method, and identifying an intermittent fault signal in the data set; (3) processing the detected intermittent fault signal by using empirical wavelet transform to realize adaptive decomposition of the intermittent fault signal; (4) calculating a Pearson correlation coefficient of an empirical mode component and an original intermittent fault signal and kurtosis of the empirical mode component, and optimizing the selected component to carry out characteristic extraction; (5) quickly matching the intermittent fault signal to be identified with a plurality of characteristic parameters of the reference intermittent fault mode through a gray correlation analysis method, and establishing a dynamically changed intermittent fault mode library; and (6) judging types of the intermittent faults according to the number of times of appearance and time differences of the different intermittent fault modes soas to obtain an online diagnosis result.
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Description

technical field

[0001] The invention relates to the technical field of on-line intermittent fault detection and diagnosis, in particular to an on-line intermittent fault detection and diagnosis method based on signal singular point detection, empirical wavelet transform and gray correlation degree analysis. Background technique

[0002] Intermittent faults are very common in production and life, and pose a huge threat to system performance and equipment safety. According to statistics, intermittent faults in integrated circuits are usually 10-30 times that of permanent faults. Data from the US military equipment and electronics industry show that intermittent failures account for 70%-90% of the total system failures and are the main cause of system failure. As the operating environments of various equipment are becoming more and more diverse, many equipment even work in extremely harsh environments with ultra-high temperature, ultra-low temperature, high radiation, and high...

Claims

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