A Feature Extraction Method for Compound Faults of Planetary Gearbox

A planetary gearbox and compound fault technology, which is applied in the direction of machine gear/transmission mechanism testing, complex mathematical operations, etc., can solve problems such as the inability to effectively solve the problem of crack identification of planetary gearboxes, so as to avoid sudden accidents and reduce The effect of economic loss

Active Publication Date: 2020-09-15
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0005] What the present invention aims to solve is that the traditional gearbox fault diagnosis method cannot effectively solve the problems faced by the crack identification of planetary gearboxes, and provides a method for extracting composite fault features of planetary gearboxes

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  • A Feature Extraction Method for Compound Faults of Planetary Gearbox
  • A Feature Extraction Method for Compound Faults of Planetary Gearbox
  • A Feature Extraction Method for Compound Faults of Planetary Gearbox

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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific examples and with reference to the accompanying drawings.

[0041] A compound fault feature extraction method for planetary gearboxes, such as figure 1 As shown, it specifically includes the following steps:

[0042] The first step: signal acquisition.

[0043] A vibration acceleration sensor is used to pick up the vibration signal of the planetary gearbox, and the acceleration is installed on the input shaft end cover of the planetary gearbox to be tested.

[0044] The second step: adaptive construction of multi-wavelet basis functions for the collected vibration signals.

[0045] First of all, the multi-wavelet basis function is constructed using the multi-wavelet symmetric lifting framework, which ensures that the filter has a linear phase or a generalized linear phase through s...

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Abstract

The invention discloses a planetary gearbox composite fault feature extraction method. Firstly, a planetary gearbox vibration signal is measured and stored; secondly, a multi-wavelet symmetrical lifting framework is constructed, and control parameters are introduced; thirdly, multi-fractal entropy is constructed to serve as an evaluation index of a self-adaptive matching criterion, multi-wavelet self-adaptive construction is carried out through an intelligent optimization algorithm, and a multi-wavelet basis function matched with a dynamic signal is obtained; fourthly, redundant multi-wavelettransform decomposition is performed; finally, the relative energy ratio at the frequency of a fault feature in each frequency band is calculated, a frequency band relative energy ratio columnar diagram is obtained, a fault sensitive frequency band is selected, and then a composite fault is identified and separated. The method is capable of overcoming the influence of a complex transmission path and working condition noise of a planetary gearbox, and early fault features of an inner gear ring, a planetary gear and a sun gear of the planetary gearbox are extracted and separated by means of themulti-wavelet self-adaptive construction and sensitive feature frequency band selection.

Description

technical field [0001] The invention relates to the technical field of planetary gearbox fault detection, in particular to a method for extracting a compound fault feature of a planetary gearbox. Background technique [0002] Planetary gearboxes are small in size, light in weight, large in transmission ratio, high in efficiency, and strong in carrying capacity. They also have the advantages of multi-force convergence or single-force dispersion. They are widely used in various industries such as new energy vehicles, wind power generators, aerospace, and ships. system. Because planetary gearboxes often operate under harsh environmental conditions such as high speed, heavy load, and strong impact, key parts such as sun gears, planetary gears, and ring gears in planetary gearboxes are prone to wear, fatigue, broken teeth, and cracks. This kind of failure will further induce other failures, resulting in huge economic losses. Therefore, it is of great engineering significance to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/14G01M13/02
Inventor 何水龙李慧王衍学蒋占四
Owner GUILIN UNIV OF ELECTRONIC TECH
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