A Centrifugal Pump Cavitation State Discrimination Method Based on Autocorrelation Spectrum and Equilibrium Square Envelope Spectrum
A technology of state discrimination and envelope spectrum, which is applied in the field of signal processing, can solve the problems of wavelet base selection, inability to decompose and characterize high-frequency signals well, achieve strong practicability, and improve the effect of anti-noise ability
Active Publication Date: 2020-11-10
ZHEJIANG UNIV
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However, while WT achieves variable frequency resolution, it also faces the problem of wavelet base selection, and at the same time, it cannot decompose and characterize high-frequency signals containing a large amount of detailed information.
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[0052] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the following embodiments are intended to facilitate the understanding of the present invention, but do not limit it in any way.
[0053] like figure 1 As shown, a centrifugal pump cavitation state discrimination method based on autocorrelation spectrum and balanced square envelope spectrum includes the following steps:
[0054] S1, using the acceleration sensor to collect the vibration acceleration data from the normal working condition to the cavitation state of the centrifugal pump.
[0055] In order to show the advantages and characteristics of this method in the judgment of centrifugal pump cavitation, the actual centrifugal pump operating state signal is analyzed, from normal working condition to cavitation, there are 10 kinds of state data, the sampling frequency is 25000Hz, and the sampling time is 10s. Centrifugal...
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The invention discloses a method for discriminating the cavitation state of a centrifugal pump based on an autocorrelation spectrum and a balanced square envelope spectrum. Spectrum processing: perform wavelet transform and principal component analysis on the selected signal, and select the characteristic frequency according to the results of principal component analysis and the results of the autocorrelation spectrum and the balanced square envelope spectrum; according to the principle of characteristic frequency and parameter design, calculate different states The value of the parameter below, and determine the cavitation judgment threshold; for the centrifugal pump to be tested, after collecting the vibration signal, process it according to the above steps, and calculate the current parameter value; use the constant false alarm rate adaptive threshold method, according to the noise intensity adaptive Adjust the threshold; compare the current parameter value with the threshold to determine whether there is cavitation. The method of the invention automatically judges whether cavitation occurs in the centrifugal pump according to the parameters, and has strong anti-noise ability and strong practicability.
Description
technical field [0001] The invention belongs to the field of signal processing, and in particular relates to a cavitation state discrimination method of a centrifugal pump based on an autocorrelation spectrum and a balanced square envelope spectrum. Background technique [0002] Centrifugal pumps are widely used in industries such as electric power, metallurgy, coal, and building materials. However, centrifugal pumps often operate in complex environments with high pressure and high speed, and cavitation failures are prone to occur. Cavitation not only produces strong vibration and noise, but also damages the surface of the impeller, which seriously affects the working performance and service life of the centrifugal pump. The cavitation signal of centrifugal pump is modulated by multiple components, which is complex and accompanied by strong background noise. The cavitation fault is harmful, the mechanism is complex, and the primary characteristics are not obvious. How to ex...
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IPC IPC(8): F04D15/00G06K9/00
CPCF04D15/0088G06F2218/06G06F2218/08
Inventor 初宁汪琳琳宁岳吴大转武鹏曹琳琳
Owner ZHEJIANG UNIV