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Bayesian network-based rolling bearing fault diagnosis method

A Bayesian network and fault diagnosis technology, applied in mechanical bearing testing and other directions, can solve complex problems, achieve outstanding fault characteristics, improve accuracy and speed, and good interpretability

Active Publication Date: 2013-04-17
SHAANXI UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

However, it is a complex and difficult task to use signal features for fast and accurate fault diagnosis in noisy, uncertain, and dynamic environments.

Method used

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  • Bayesian network-based rolling bearing fault diagnosis method
  • Bayesian network-based rolling bearing fault diagnosis method
  • Bayesian network-based rolling bearing fault diagnosis method

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Embodiment Construction

[0040] The present invention will be described in detail below in combination with specific embodiments.

[0041] Step 1: Set the fault diagnosis reliability threshold parameter θ * and fault sample initial parameters. Set the size of the initial value of the sample data group m; set the number of fault type Bearing value event q; set the fault type initial value parameter s={1,...,q}, type tag tag_s={1,...,q}. θ * The range is generally 0.7 to 0.8 (ie 70% to 80%); the value of m is usually 80 to 100; the value of q is usually 3 or 4.

[0042] Step 2: The vibration signal of the bearing is often monitored and collected through the vibration sensor system installed in the bearing seat, box, etc., and the vibration signal caused by different faults is sampled to obtain sample data data_s={tag_s f s (n) | L=mN; m and N are positive natural numbers; n=0,...,L-1}; N value is usually 1024. Wherein the acquisition signal f s (n) Divide into m groups of data with a length of N ea...

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Abstract

The invention relates to a Bayesian network (BN)-based rolling bearing fault diagnosis method. According to a common rolling bearing fault diagnosis method, a mathematical model is required to be established, and an initial diagnosis effect is unsatisfactory; problems of the selection of a wavelet base function are unsolved; and the interpretability of a deduction process is low. The method comprises the following steps of: sampling a vibration signal of a bearing, acquiring a sample, performing N-point rapid Fourier transformation processing to convert a time-domain signal into a frequency-domain signal, calculating a fault characteristic vector, discretizing the fault characteristic vector, establishing a fault diagnosis reasoning BN model, setting a fault sample to be diagnosed, acquiring an observational evidence of the bearing, finishing updating the reliability Theta of a fault diagnosis type node Bearing in the BN model, calculating a fault diagnosis type node, and outputting a result. A complex mathematical modeling process for the vibration signal is avoided, an obtained diagnosis reasoning model has the advantages of a few characteristic parameters, prominent fault characteristics, high interpretability and the like, and an effective way for solving the problems of the rolling bearing fault diagnosis is provided.

Description

technical field [0001] The invention relates to a fault diagnosis method using characteristic signals for modeling and reasoning, in particular to a rolling bearing fault diagnosis method based on a Bayesian network. Background technique [0002] Rolling bearings are one of the most important mechanical parts in rotating machinery. They are widely used in chemical industry, metallurgy, electric power, aviation and other important departments. At the same time, they are also one of the most vulnerable components. The performance and working conditions of bearings directly affect the performance of the shafts associated with them, the gears installed on the shafts, and even the entire machine equipment. Their defects will cause abnormal vibration and noise of the equipment, and even cause equipment damage. Therefore, it is particularly important to diagnose rolling bearing faults, especially for the analysis of early faults, and to avoid accidents in production practice....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/04
Inventor 郭文强侯勇严周强付菊
Owner SHAANXI UNIV OF SCI & TECH
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