Gear fault diagnosis method based on part mean decomposition cycle frequency spectrum

A technology of local mean value decomposition and cycle frequency, which is applied in the direction of machine gear/transmission mechanism testing, etc., to achieve the effect of accurate fault diagnosis

Inactive Publication Date: 2009-11-25
HUNAN UNIV
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Problems solved by technology

[0003] In order to solve the above-mentioned technical problems existing in the existing gear fault vibration signal diagno

Method used

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  • Gear fault diagnosis method based on part mean decomposition cycle frequency spectrum
  • Gear fault diagnosis method based on part mean decomposition cycle frequency spectrum
  • Gear fault diagnosis method based on part mean decomposition cycle frequency spectrum

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[0027] In the process of gear fault diagnosis, the acceleration sensor needs to be used to measure the gearbox first to obtain the vibration acceleration signal x(t), and then the vibration acceleration signal is decomposed to extract the characteristic value. The present invention uses the local mean value decomposition method to decompose the vibration acceleration signal, and the specific process is shown in figure 1 .

[0028] The following describes the principle of the gear fault diagnosis method based on the local mean value decomposition cycle frequency in detail in conjunction with the flowchart. Specific steps are as follows:

[0029] 1) Mount the piezoelectric acceleration sensor on the gearbox housing, and collect the gearbox vibration acceleration signal x(t).

[0030] 2) Find all the local extreme points n of the gear vibration acceleration signal x(t) i , Find the average value of all adjacent local extreme points:

[0031] m i ...

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Abstract

The invention discloses a gear fault diagnosis method based on a part mean decomposition cycle frequency spectrum. The part mean decomposition method vibrating signal is decomposed as the sum of a plurality of amplitude-modulation frequency-modulation signals with single component, obtaining the instantaneous frequencies of the components and the changing situation of the instantaneous frequencies of the components, which is suitable for processing AM-FM signals with a plurality of components. When the gear has faults, the vibrating signal is generally AM-FM signal; the part mean decomposition method is used for obtaining the changing situation of the instantaneous frequency of the gear vibrating signal along time, further analyzing the instantaneous frequencies to obtain the circulated frequency spectrum to identify the gear state and the faults.

Description

technical field [0001] The invention relates to a gear fault diagnosis method based on local mean decomposition cycle frequency spectrum. Background technique [0002] When a gear box fails, most of its vibration signals are multi-component AM-FM signals, so demodulation analysis has become a common signal processing method for gear fault diagnosis. Extracting modulation signals from vibration signals and analyzing their intensity and frequency is The degree and location of damage to parts can be judged. However, most of them focus on extracting amplitude modulation information, while there are relatively few studies on phase modulation. At present, in the gear fault diagnosis method based on demodulation analysis, since the modulation information can be obtained by extracting the envelope of the gear fault signal through Hilbert transform, and the Hilbert transform has a fast algorithm, it is hoped that The Halbert transform is the most commonly used method for demodulati...

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Application Information

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IPC IPC(8): G01M13/02
Inventor 程军圣杨宇
Owner HUNAN UNIV
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