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Rotational speed estimation method and device based on gear meshing vibration

A speed estimation and gear technology, applied in the field of signal processing, can solve problems such as poor accuracy and weak anti-noise ability

Inactive Publication Date: 2013-10-02
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the process of realizing the embodiment of the present invention, the inventor found that this method has the disadvantages of weak anti-noise ability and poor accuracy of the estimated rotational speed curve

Method used

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  • Rotational speed estimation method and device based on gear meshing vibration
  • Rotational speed estimation method and device based on gear meshing vibration
  • Rotational speed estimation method and device based on gear meshing vibration

Examples

Experimental program
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Effect test

Embodiment 1

[0105] Embodiment 1: Application in fault feature detection of bearing outer ring;

[0106] When there are local damages or defects in the bearing, a sudden attenuation impact pulse force will be generated during the loading process, which will excite the high-frequency natural vibration of the bearing. This high-frequency natural vibration acts as the carrier wave of bearing vibration, and its amplitude will be modulated by the pulse excitation force caused by these defects, so that the final vibration waveform of the bearing will appear as a complex amplitude modulation wave, so it is necessary to use the envelope solution The vibration signal of the bearing is tuned to obtain the characteristic frequency of the modulation component.

[0107] The bearing fault vibration signal under variable speed is unsteady, and the envelope demodulation analysis will fail to detect the fault characteristics because of the frequency ambiguity on the envelope demodulation spectrum. Every t...

Embodiment 2

[0113] Embodiment 2: application in gear fault feature detection;

[0114] When the gear breaks, the natural vibration of the gear teeth will be excited when the broken teeth enter into mesh. This excitation will appear once every time the gear rotates, and it will appear on the frequency spectrum near the natural frequency of the gear. The side frequency band, and the bandwidth of the side frequency band is equal to the rotation frequency of the driving wheel.

[0115]The gear meshing vibration signal under variable speed is unsteady, and the order ratio analysis method is used to diagnose the fault of the gear meshing vibration signal, and the method described in the embodiment of the present invention is used to extract the speed information from the gear meshing vibration signal, and based on the speed information, in turn The gear meshing vibration signal is resampled at equal angles, and the order ratio analysis is carried out, so as to realize the fault diagnosis. In o...

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Abstract

The embodiment of the invention discloses a rotational speed estimation method and device based on gear meshing vibration, which are used for enhancing the anti-noise capability and improving the precision of the estimated rotational speed curve. The rotational speed estimation method comprises the following steps: acquiring a gear meshing vibration signal; calculating the Wigner-Ville distribution and the wavelet scale spectrum of the gear meshing vibration signal; achieving time-frequency fusion of the Wigner-Ville distribution and the wavelet scale spectrum to obtain the time-frequency fusion distribution; according to the time-frequency fusion distribution, determining the gear meshing frequency curve; according to the gear meshing frequency curve and the number of gears of a driving wheel, determining the rotational speed curve of the driving wheel.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a speed estimation method and device based on gear meshing vibration. Background technique [0002] The speed provides key information for the system dynamics of rotating machinery, especially for fault diagnosis at variable speeds; in rotating machinery with gear mesh vibration, using speed estimation can directly extract the speed information from the gear mesh vibration signal without Professional speed measuring equipment such as a tachometer needs to be installed, which greatly reduces hardware requirements. Under normal circumstances, the gear meshing vibration is caused by the periodic change of the contact stress between the two gear contact surfaces. The frequency of the stress cycle change is equal to the gear meshing frequency. Therefore, the gear meshing vibration signal contains the gear meshing frequency information theoretically. The speed estimation met...

Claims

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Application Information

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IPC IPC(8): G01P3/00
Inventor 李成曹书峰朱忠奎黄伟国
Owner SUZHOU UNIV
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