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Early fault diagnosis method of bearing outer ring based on adaptive MCKD

A bearing outer ring, early fault technology, applied in early fault diagnosis of bearing outer ring, based on adaptive MCKD in the field of early fault diagnosis of bearing outer ring, can solve the problem of MCKD noise reduction effect and other problems, to achieve the effect of accurate diagnosis

Inactive Publication Date: 2018-12-21
BEIJING UNIV OF TECH
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Problems solved by technology

[0004] Aiming at the problem that the noise reduction effect of MCKD is affected by the filter order L and the displacement order M

Method used

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  • Early fault diagnosis method of bearing outer ring based on adaptive MCKD
  • Early fault diagnosis method of bearing outer ring based on adaptive MCKD
  • Early fault diagnosis method of bearing outer ring based on adaptive MCKD

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0037] Such as figure 1 As shown, it is a working flow chart of an early bearing outer ring fault diagnosis method based on adaptive MCKD of the present invention. The specific implementation process is as follows:

[0038] (1) Input the measured signal, and determine the parameter period T by calculating the signal fault characteristic frequency;

[0039] The essence of MCKD is to find a FIR filter f(l) (l is the length of the filter) to maximize the correlation kurtosis of the original shock sequence and enhance the signal. The correlation kurtosis is defined as

[0040]

[0041] In the formula: M is the displacement number; m=0,1,...,M,T s is the corresponding sampling point of the iteration cycle, where fs is the sampling rate, T is the time period of interest, N is the number of sampling points, n=0,1,...,N.

[0042] The frequency at which a r...

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Abstract

The invention discloses an early fault diagnosis method of a bearing outer ring based on an adaptive MCKD, which is a diagnosis method aiming at the early fault of the bearing outer ring. Aiming at the problem that the noise reduction effect of the MCKD is affected by the filter order L and the displacement order M, the invention studies the fault mechanism of the bearing, and puts forward an early fault diagnosis method of the bearing outer ring based on the adaptive MCKD. Under different M values, the average value of Teager spectrum kurtosis is calculated respectively, and the optimal displacement order M is selected. Then, taking Teager spectrum kurtosis as objective function, the optimal filter order L is searched by iterative algorithm, and the weak fault feature is extracted by envelope spectrum. Compared with the minimum entropy deconvolution (MED) algorithm, this method shows higher accuracy, which proves the accuracy of this method in early fault diagnosis of bearing outer ring.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis, and relates to an early fault diagnosis method for an outer ring of a bearing, in particular to an early fault diagnosis method for an outer ring of a bearing based on adaptive MCKD. Background technique [0002] Rolling bearings are one of the most commonly used parts in mechanical equipment, and their operating status directly affects the performance of the entire machine. When the bearing is partially damaged or defective, it will cause noise and abnormal vibration of the equipment in the slightest, and damage the equipment in severe cases. In practical engineering applications, early fault diagnosis of rolling bearings is relatively difficult due to the influence of many factors such as complex and changeable vibration transmission paths, serious noise interference in the working environment, and mutual coupling of excitation and response of multiple vibration sources. [0003] For t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G01M13/04
CPCG01M13/045G06F2218/00
Inventor 崔玲丽杜建喜刘志峰张超
Owner BEIJING UNIV OF TECH
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