CN114264366A - Method for monitoring multi-angle vibration components of pump shell of water pump unit - Google Patents
Method for monitoring multi-angle vibration components of pump shell of water pump unit Download PDFInfo
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- CN114264366A CN114264366A CN202111577799.7A CN202111577799A CN114264366A CN 114264366 A CN114264366 A CN 114264366A CN 202111577799 A CN202111577799 A CN 202111577799A CN 114264366 A CN114264366 A CN 114264366A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 5
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 6
- 230000010360 secondary oscillation Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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Abstract
The invention relates to a method for monitoring multi-angle vibration components of a pump shell of a water pump unit, which comprises the steps of respectively installing a displacement sensor in the x-axis direction and the y-axis direction of the pump shell of the water pump, testing the decomposition displacement of a water outlet pump at the same time, calculating the angle of the vibration on a polar coordinate, and calculating the vibration frequency by using Fourier transform; and finally, simultaneously drawing the amplitude and the frequency of each vibration in each direction on a two-dimensional polar coordinate graph. According to the invention, the vibration characteristics and the direction of the pump shell of the water pump can be detected for a long time through the two-dimensional graph, so that real-time monitoring is realized.
Description
Technical Field
The invention relates to a method for monitoring multi-angle vibration components of a pump shell of a water pump unit, and belongs to the field of hydraulic engineering.
Background
Spectral analysis has been an important tool for device failure problem detection. However, the detection is performed by using a handheld or fixedly mounted detector, and the detection result is inaccurate because the error of the detection position and the correlation of the vibration values of 2 vertical and horizontal positions cannot be established. By adopting the method, the amplitude and frequency characteristic value of each azimuth of the same time segment can be obtained, and the vibration detection precision is improved.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a method for monitoring multi-angle vibration components of a pump shell of a water pump unit, which solves the problem of judging vibration orientation by synthesizing vertical and horizontal vibration signals in the traditional single detection.
The purpose of the invention is realized as follows: a method for monitoring multi-angle vibration components of a pump shell of a water pump unit is characterized by comprising the following steps: respectively installing a displacement sensor on the x-axis and the y-axis directions of a pump shell of the water pump, testing the decomposition displacement of the water pump at the same time, and calculating the angle of the vibration on a polar coordinate by the following formula:
wherein,
representing the amplitude of the vibration at the angle theta; d θ: the angle of the secondary oscillation; dx: under the secondary vibration, the displacement in the direction measured by the x-direction sensor; dy: under the vibration, the displacement in the direction measured by the y-direction sensor;
meanwhile, calculating the vibration frequency by using Fourier transform;
and finally, simultaneously drawing the amplitude and the frequency of each vibration in each direction on a two-dimensional polar coordinate graph.
The displacement sensor is a vibration sensor.
Each time of vibration is calculated by two displacement sensors which are arranged on a pump shell of the water pump and are vertical to the coordinate axis direction, a time domain spectrogram of the angle is firstly generated, a frequency domain spectrogram is obtained through Fourier transformation, the amplitude and the frequency of the vibration are recorded, and the next calculation is carried out;
when the same angle has vibration with the same frequency or similar frequency for ten times, a line covering the amplitude range and marked with the frequency appears at the angle.
The method is advanced and scientific, and through the method, displacement sensors are respectively arranged on the pump shell of the water pump in the directions of the x axis and the y axis, the decomposition displacement of the water pump at the same time is tested, and then the following formula is adopted:
the angle of the vibration in polar coordinates can be calculated.
By using
Representing the amplitude of the vibration at the angle theta. Meanwhile, the Fourier transform is used for calculating the vibration frequency, and the amplitude and the frequency of each vibration in each direction are simultaneously drawn on a two-dimensional polar coordinate graph.
Has the advantages that:
the position of the time domain frequency spectrum is obtained on the pump shell of the water pump unit, and the position and the characteristics of the water pump fault can be effectively predicted. The vibration amplitude and the frequency direction are simultaneously reflected on a two-dimensional graph, and the vibration characteristics and the direction of the pump shell of the water pump can be detected for a long time through the two-dimensional graph, so that real-time monitoring is realized.
The main purpose of the invention is to accurately monitor the running state of the water pump by decomposing the overall vibration of the water pump into vibration frequency and amplitude at different angles.
With the increasing development of water pump technology, the monitoring of the running state of the water pump is also attracting more and more attention. At present, the existing monitoring thought is mainly to preliminarily judge the running condition of the water pump through the frequency and amplitude of a vibration signal of the water pump unit. The invention can measure the vibration components of the pump shell of the unit at a plurality of angles, and can effectively improve the accuracy of the monitoring method.
Drawings
FIG. 1 is a schematic view of a vertically arranged displacement sensor of the present invention;
FIG. 2 is a graph of a spectrum for simultaneously recording multi-angle vibration amplitude and frequency in polar coordinates according to the present invention.
In the figure: 1 impeller, 2 guide vanes and 3 displacement sensors.
Detailed Description
The invention is further described with reference to the accompanying drawings and the description thereof.
A method for monitoring multi-angle vibration components of a pump shell of a water pump unit comprises the steps of respectively installing a displacement sensor in the x-axis direction and the y-axis direction of the pump shell of the water pump, testing the decomposition displacement of a water outlet pump at the same time, and calculating the angle of the vibration on a polar coordinate by the following formula:
wherein,
representing the amplitude of the vibration at the angle theta; d θ: the angle of the secondary oscillation; dx: under the secondary vibration, the displacement in the direction measured by the x-direction sensor; dy: under the vibration, the displacement in the direction measured by the y-direction sensor;
meanwhile, calculating the vibration frequency by using Fourier transform;
and finally, simultaneously drawing the amplitude and the frequency of each vibration in each direction on a two-dimensional polar coordinate graph.
Further:
(1) the invention is suitable for all built pump stations.
(2) The fixed-point multi-angle vibration tester avoids errors caused by different test points and test angles during each test, and can improve the matching precision of field test results and fault library data.
(3) The new polar coordinate graph generation flow comprises the following steps: vibration every time is calculated by two displacement sensors which are arranged on a pump shell of the water pump and are vertical to the coordinate axis direction, a time domain spectrogram of the angle is generated firstly, a frequency domain spectrogram is obtained through Fourier transformation, the amplitude and the frequency of the vibration are recorded, and the next calculation is carried out. When the same angle has vibration of the same frequency (similar frequency) ten times, a line covering the amplitude range and marked with the frequency appears at the angle. Therefore, the frequency can be prevented from being too fast, the human eyes can not observe the frequency, and the periodic vibration can be screened to remove noise.
Claims (2)
1. A method for monitoring multi-angle vibration components of a pump shell of a water pump unit is characterized by comprising the following steps: respectively installing a displacement sensor on the x-axis and the y-axis directions of a pump shell of the water pump, testing the decomposition displacement of the water pump at the same time, and calculating the angle of the vibration on a polar coordinate by the following formula:
wherein,
representing the amplitude of the vibration at the angle theta; d θ represents the angle of the vibration; dx represents the displacement in the direction measured by the x-direction sensor at the vibration; dy represents the displacement in the direction measured by the y-direction sensor under the vibration;
meanwhile, calculating the vibration frequency by using Fourier transform;
and finally, simultaneously drawing the amplitude and the frequency of each vibration in each direction on a two-dimensional polar coordinate graph.
2. The method for monitoring the multi-angle vibration component of the pump shell of the water pump unit as claimed in claim 1, wherein the method comprises the following steps: each time of vibration is calculated by two displacement sensors which are arranged on a pump shell of the water pump and are vertical to the coordinate axis direction, a time domain spectrogram of the angle is firstly generated, a frequency domain spectrogram is obtained through Fourier transformation, the amplitude and the frequency of the vibration are recorded, and the next calculation is carried out;
when the same angle has vibration with the same frequency or similar frequency for ten times, a line covering the amplitude range and marked with the frequency appears at the angle.
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| CN202111577799.7A CN114264366A (en) | 2021-12-22 | 2021-12-22 | Method for monitoring multi-angle vibration components of pump shell of water pump unit |
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| CN202111577799.7A CN114264366A (en) | 2021-12-22 | 2021-12-22 | Method for monitoring multi-angle vibration components of pump shell of water pump unit |
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2021
- 2021-12-22 CN CN202111577799.7A patent/CN114264366A/en active Pending
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| CN101451883A (en) * | 2008-12-24 | 2009-06-10 | 南京大学 | Short time two-dimension holographic spectrum array for vibration analysis for mechanical rotating shaft |
| CN101526431A (en) * | 2009-04-13 | 2009-09-09 | 南京大学 | Amplitude spectrum array waterfall plot for shaft vibration analysis of starting-stopping process |
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