Method for rotation speed extraction through peeling off fault corresponding impact by employing rolling ball track

A rolling bearing and feature extraction technology, which is applied in the field of fault diagnosis technology and signal processing and analysis, can solve the problems of difficulty in installing the tachometer, inability to directly obtain the speed signal, and inconvenient hardware installation, so as to avoid installation restrictions and save the cost of speed extraction Effect

Inactive Publication Date: 2016-10-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former not only needs a special tachometer to complete the speed monitoring, but also needs a corresponding data acquisition device. However, under actual working conditions, it is difficult to install a tachometer on many devices and cannot directly obtain the speed signal. The application of this method has caused great problems. Inc

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  • Method for rotation speed extraction through peeling off fault corresponding impact by employing rolling ball track
  • Method for rotation speed extraction through peeling off fault corresponding impact by employing rolling ball track
  • Method for rotation speed extraction through peeling off fault corresponding impact by employing rolling ball track

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Embodiment 1

[0027] Embodiment 1: as Figure 1-4 As shown, a method for extracting the rotational speed through the corresponding impact characteristics of the spalling fault of the rolling bearing raceway, the specific steps of the method are as follows:

[0028] Step1. Use the charge amplifier to amplify the original vibration signal of the faulty rolling bearing collected by the acceleration sensor;

[0029] Step2. Perform AR pre-whitening processing on the amplified original vibration signal, and then use the MED filter method combined with spectral kurtosis to enhance the fault impact characteristics in the pre-whitening signal to obtain vibration signals with obvious fault impact characteristics;

[0030] Step3, carry out Hillbert transformation to the signal obtained in step Step2, construct envelope signal;

[0031] Step4, extracting the impact feature position information in the envelope signal greater than the threshold;

[0032] Step5. First determine the number of impact feat...

Embodiment 2

[0040] Embodiment 2: as Figure 1-4 As shown, a method for extracting the rotational speed through the corresponding impact characteristics of the spalling fault of the rolling bearing raceway, the specific steps of the method are as follows:

[0041] Step1. Use the charge amplifier to amplify the original vibration signal of the faulty rolling bearing collected by the acceleration sensor;

[0042] Step2. Perform AR pre-whitening processing on the amplified original vibration signal, and then use the MED filter method combined with spectral kurtosis to enhance the fault impact characteristics in the pre-whitening signal to obtain vibration signals with obvious fault impact characteristics;

[0043] Step3, carry out Hillbert transformation to the signal obtained in step Step2, construct envelope signal;

[0044] Step4, extracting the impact feature position information in the envelope signal greater than the threshold;

[0045] Step5. First determine the number of impact feat...

Embodiment 3

[0051] Embodiment 3: as Figure 1-4 As shown, a method for extracting the rotational speed through the corresponding impact characteristics of the spalling fault of the rolling bearing raceway, the specific steps of the method are as follows:

[0052] The specific parameters are as follows: 1) Type 6205 rolling ball bearing is selected, the pitch diameter is 38.5mm, the rolling element diameter is 7.938mm, the number of rolling elements is 9, and the contact angle is 0°; 2) The fault type is peeling fault of the outer ring; 3) Use NI USB9215 data acquisition card and DH-5853 charge amplifier for high-frequency sampling, and set the rotational speed at 9.77 Hz; 4) The sensor selected in the acquisition example is a piezoelectric acceleration sensor.

[0053] Step1. Use the acceleration sensor and the charge amplifier to collect the time-domain original vibration signal of the outer ring peeling fault rolling bearing, such as figure 2 shown;

[0054]Step2. Perform noise reduc...

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Abstract

The present invention relates to a method for rotation speed extraction through peeling off fault corresponding impact by employing a rolling ball track, belonging to the field of the fault diagnosis technology and the signal processing analysis technology. A charge amplifier is employed to perform amplification process of the original vibration signals, collected by an accelerometer, of a fault rolling bearing; the original vibration signals after the amplification process are subjected to the AR pre-whitening processing, an MED filtering method with the combination of a spectrum kurtosis is employed to enhance the fault impact feature in the pre-whitening signals, and the obvious vibration signals of the fault impact feature are obtained; the obvious vibration signals of the fault impact feature are subjected to Hillbert transformation, and enveloping signals are constructed; the impact feature position information in the enveloping signals of larger than a threshold is extracted; the rotation speed of a maintenance support is calculated; and the rotation speed of a rotating shaft is calculated according to the rotation speed of the maintenance support. The method provided by the invention is much simpler and better effective than other rotation speed extraction methods, can avoid the inhibition of the work condition for the installation of a collection device, and can save the rotation speed extraction cost.

Description

technical field [0001] The invention relates to a method for extracting a rotating speed through the impact characteristics corresponding to the spalling fault of a rolling bearing raceway, and belongs to the technical field of fault diagnosis technology and signal processing and analysis. Background technique [0002] Affected by factors such as voltage fluctuations and load changes, rotating machinery in operation will have speed changes. Accurate and effective speed measurement is beneficial to the status monitoring of rotating machinery and subsequent fault diagnosis and analysis. [0003] Order ratio analysis is an important means to deal with the unsteady signal of rotating machinery. Order ratio sampling is an important link in order ratio analysis, and it is necessary to track and filter the vibration signals of rotating machinery during the speed up and down stages. At present, the commonly used tracking filtering methods include hardware-based filtering methods an...

Claims

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Application Information

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IPC IPC(8): G01P3/00G01M13/04
CPCG01P3/00G01M13/045
Inventor 郭瑜康伟伍星伞红军高贯斌陈庆贺玮
Owner KUNMING UNIV OF SCI & TECH
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