A Single-point Fault Diagnosis Method for Bearings Based on Cepstrum Pseudo-Margin

Abstract

The invention provides a new rolling bearing fault feature extraction method based on the cepstrum pseudo-margin. The method includes the steps that the cepstrum is calculated according to rolling bearing vibration signals; the variance in the time domain is calculated according to original monitoring signals; corresponding pseudo-margins are calculated according to cepstrum signals; distinguishing criteria and distinguishing spatial dimensions n are calculated and determined according to the cepstrum pseudo-margin index distribution; pseudo-margin absolute values in the ith-dimensional distinguishing space are extracted in sequence; fault feature extraction and diagnostic pseudo-margin calibration values are calculated and determined for distinguishing fault feature signals. By means of the method, single-point fault feature signals of the rolling bearing can be effectively extracted, and the diagnosis result has high precision.

Description

technical field [0001] The invention relates to the field of fault diagnosis of rolling bearings, in particular to a method for extracting and diagnosing characteristic signals of single point faults of rolling bearings. Background technique [0002] Bearings are commonly used components in many large modern equipment to withstand various loads and pressures. Long-term continuous work will cause some failures in some parts of the bearing, and this state will affect the safety of the equipment and even the entire working process. Commonly used rolling bearings are composed of inner ring, outer ring and balls, and these parts may have single fault or complex fault. [0003] The frequency characteristics of vibration signals of rolling bearings are not consistent under normal operating conditions or certain fault conditions. According to the different frequency characteristics, a data-driven fault diagnosis method can be implemented at present. The implementation method is ma...

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a single-point fault diagnosis method for rolling bearings, which is used to solve the problem that the single-point fault diagnosis of rolling bearings is too complicated in the prior art

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