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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 diagnosis, the present invention provides a gear fault diagnosis method based on local mean decomposition cycle frequency spectrum

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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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Embodiment Construction

[0027] In the process of gear fault diagnosis, it is first necessary to use the acceleration sensor to measure the gear box to obtain the vibration acceleration signal x(t), and then decompose the vibration acceleration signal to extract the characteristic value. The present invention utilizes the local mean value decomposition method to decompose the vibration acceleration signal, and its specific process is shown in figure 1 .

[0028] The principle of the gear fault diagnosis method based on the local mean decomposition cycle frequency will be described in detail below in conjunction with the flow chart. Specific steps are as follows:

[0029] 1) Install the piezoelectric acceleration sensor on the gearbox housing to collect the vibration acceleration signal x(t) of the gearbox.

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

[0031] m ...

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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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