Fault diagnosis method for reducer based on VMD and PCT

A technology of fault diagnosis and reducer, which is applied in the direction of instrumentation, mechanical component testing, machine/structural component testing, etc. It can solve the problem that the reducer fault diagnosis method cannot take into account gear fault and bearing fault diagnosis, etc., so as to avoid sudden The effect of reducing the occurrence of sexual accidents, reducing economic losses, and reducing labor costs

Active Publication Date: 2019-04-09
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0003] What the present invention aims to solve is the problem that the existing reducer fault diagnosis method cannot take i

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  • Fault diagnosis method for reducer based on VMD and PCT
  • Fault diagnosis method for reducer based on VMD and PCT
  • Fault diagnosis method for reducer based on VMD and PCT

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Embodiment Construction

[0027] 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.

[0028] see figure 1 , a reducer fault diagnosis method based on VMD and PCT, uses the VMD algorithm to decompose the original signal to obtain several modal components, takes the component with the most obvious impact characteristics as the input of the PCT algorithm, and obtains the time-frequency diagram of the gear and the time-frequency diagram of the bearing respectively . The fault frequency and cycle period are obtained from the gear time-frequency diagram, which are used to locate the gear fault source; at the same time, the gear fault severity judgment rule is established according to the number of periodic time-frequency bands, which provides a reference for the maintenance of the reducer. The cycle frequency is o...

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Abstract

The present invention discloses a fault diagnosis method for a reducer based on VMD (empirical mode decomposition) and PCT (polynomial frequency-modulated wavelet transform). The method comprises: selecting the modal component with most obvious features obtained by using the VMD algorithm as input of PCT to obtain a gear time-frequency diagram and a bearing time-frequency diagram respectively; according to the fault frequency and the cycle period on the gear time-frequency diagram, determining the position of a faulty gear for positioning a gear fault source; based on the number of obviously periodic time-frequency bands, giving out a determination result of the severity of the gear fault; and determining the type of the bearing fault according to the cycle period on the bearing time-frequency diagram. According to the method provided by the present invention, through the combination of gear diagnosis and bearing diagnosis, the diagnostic efficiency and the recognition accuracy are improved, and the complete diagnosis of the reducer is realized.

Description

technical field [0001] The invention relates to the technical field of component fault diagnosis, in particular to a method for fault diagnosis of a reducer based on VMD and PCT. Background technique [0002] The reducer is an independent component composed of gear transmission, worm transmission, gear-worm transmission, etc. enclosed in a rigid shell, and is often used as a reduction transmission device between the driving machine and the working machine. In various fields of national economy and national defense industry, reducers are widely used. Due to the harsh operating environment of the reducer, it is easy to cause various failures of the reducer, and the object of the reducer is closed, the internal structure is complicated, and manual inspection is inconvenient. Therefore, it is of great significance to carry out effective fault diagnosis. The common faults of the reducer mainly include bearing faults and gear faults, and the traditional diagnosis method often jud...

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Application Information

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IPC IPC(8): G01M13/028
CPCG01M13/028
Inventor 蒋占四徐飞余鼐宋威震黄惠中谢凤乐
Owner GUILIN UNIV OF ELECTRONIC TECH
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