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Early fault diagnosis method for rolling bearing based on MED and cepstrum

A rolling bearing, early failure technology, applied in mechanical bearing testing, mechanical component testing, machine/structural component testing, etc., can solve problems such as difficulty in extracting fault features by cepstrum method, inconspicuous impact components, and difficulty in identifying faults. , to achieve the effect of increased amplitude, more faults, and fault identification

Inactive Publication Date: 2018-11-20
CHINA HELICOPTER RES & DEV INST
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] If there is an early partial fault in the fault, the impact component is not obvious, and it is easily covered by random noise interference, making it difficult to identify the fault
It is difficult to extract fault features using the cepstrum method alone

Method used

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  • Early fault diagnosis method for rolling bearing based on MED and cepstrum
  • Early fault diagnosis method for rolling bearing based on MED and cepstrum
  • Early fault diagnosis method for rolling bearing based on MED and cepstrum

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Embodiment Construction

[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention.

[0035] The invention uses the MED method to reduce the noise of the vibration acceleration signal. In the early fault diagnosis process of the rolling bearing, it is first necessary to use the acceleration sensor to measure the rolling bearing to obtain the vibration acceleration signal y n , and then perform MED noise reduction on the vibration acceleration signal to eliminate noise interference.

[0036] The specific steps of the rolling bearing early fault diagnosis method based on MED and cepstrum of the present invention are as follows, as figure 1 Shown:

[0037] Step 1: Use the acceleration sensor to measure the rolling bearing equipment to obtain the vibration acceleration sign...

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Abstract

The invention relates to an early fault diagnosis method for a rolling bearing based on MED and cepstrum and belongs to the technical field of machinery fault diagnosis. The method comprises steps that S1, an acceleration sensor is utilized to measure a rolling bearing device to obtain a vibration acceleration signal; S2, MED noise reduction is performed on the vibration acceleration signal to obtain a noise-reduced signal; and S3, the MED noise-reduced signal is subjected to cepstrum analysis, in combination with experiments, fault features are extracted. The method is advantaged in that a rolling bearing acceleration signal is preprocessed through utilizing the MED method, an impact component of the signal is enhanced while noise is reduced, the magnitude of a fault frequency point on the cepstrum can be increased, and faults are easier to identify.

Description

technical field [0001] The invention belongs to the technical field of mechanical fault diagnosis, in particular to an early fault diagnosis method for rolling bearings based on MED and cepstrum. Background technique [0002] Rolling bearings are widely used in various rotating machinery, and their defects and damage will directly affect the stable operation of equipment. The common faults of rolling bearings include inner ring faults, outer ring faults and ball faults, etc. These faults will form periodic impact components. The superposition of speed signal, random signal and fault signal will form the periodic component of the modulated signal. The cepstrum method can separate and extract the periodic components of densely modulated signals that are difficult to identify, and simplify the clustered edge spectral lines on the original spectrogram to a single spectral line on the cepstrum, thus making the complex periodic components in the spectrum more complex. Clear and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/04
CPCG01M13/045
Inventor 孙伟张先辉熊天旸李新民金小强
Owner CHINA HELICOPTER RES & DEV INST
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