Bearing fault diagnosis method based on KNN-AdaBoost

A fault diagnosis and bearing technology, applied in the testing of mechanical components, testing of machine/structural components, instruments, etc., can solve problems such as accurate diagnosis of bearing faults

Inactive Publication Date: 2019-03-19
XI'AN POLYTECHNIC UNIVERSITY
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  • Bearing fault diagnosis method based on KNN-AdaBoost
  • Bearing fault diagnosis method based on KNN-AdaBoost
  • Bearing fault diagnosis method based on KNN-AdaBoost

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[0075] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0076] The bearing fault diagnosis method based on KNN-AdaBoost is carried out according to the following steps:

[0077] Step 1, obtain the multi-segment vibration signals of the shearer bearing in different states, and use all the vibration signals in each segment of the vibration signal as a set of vibration signals;

[0078] Step 2, each vibration signal in each group of vibration signals is preprocessed into a modal component for determining the center frequency and bandwidth, and multiple groups of modal components for determining the center frequency and bandwidth are obtained;

[0079] In step 2, preprocess each vibration signal into a modal component that determines the center frequency and bandwidth according to the following steps:

[0080] Step 2.1, establish a constrained variational model for each vibration signal, specifically...

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Abstract

The invention discloses a bearing fault diagnosis method based on KNN-AdaBoost, which comprises the following steps of: preprocessing vibration signals into modal components for determining a center frequency and a bandwidth according to a variational modal decomposition algorithm, respectively selecting the modal components with maximum kurtosis in each group of vibration signals, calculating toobtain a plurality of groups of bearing fault characteristic vectors; training to obtain a plurality of KNN classifiers; training according to the plurality of groups of bearing fault characteristic vectors and the plurality of KNN classifiers to obtain an AdaBoost strong classifier; and classifying the collected bearing vibration signals according to steps by using the AdaBoost strong classifier.According to the invention, based on KNN-AdaBoost, fault classification can be carried out according to a large amount of real-time bearing monitoring data, and the fault types of the bearing can bequickly identified.

Description

technical field [0001] The technical field of coal shearer fault detection of the present invention relates to a bearing fault diagnosis method based on KNN-AdaBoost. Background technique [0002] The shearer is a large complex system integrating machinery, electricity and hydraulic pressure. With the development of the coal industry, the shearer has more and more functions and its own structure is becoming more and more complex. As a standardized transmission component of a shearer, the operating state of the bearing increasingly affects the working efficiency and life of the shearer. Relevant statistics show that about 30% of all failures of coal shearers are caused by bearings. For a long time, mechanical equipment maintenance personnel have used regular spot checks and maintenance to discover and promptly eliminate bearing faults, but they are still caught off guard by sudden accidents, which are likely to cause serious losses, and regular spot checks and maintenance wi...

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Application Information

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IPC IPC(8): G01M13/045G06F17/50G06K9/00
CPCG01M13/045G06F30/20G06F2218/12
Inventor 宋玉琴邓思成师少达
Owner XI'AN POLYTECHNIC UNIVERSITY
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