Pump potential cavitation fault detecting method based on quick spectrum kurtosis analysis
A technology of fault detection and spectral kurtosis, which is applied in the field of signal processing, can solve the problems of high algorithm complexity parameter setting, non-unique wavelet base selection, and unsteady wavelet parameter combination, etc., to improve signal enhancement capabilities and enhance cavitation signal effect
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[0040] Fast Spectral Kurtosis is a fourth-order spectral analysis tool. defined as where H(n,f) is the complex envelope of the signal x(n) at frequency f. is the operator for averaging. Fast spectral kurtosis can analyze unsteady processes very well, such as transient signals, and the kurtosis value of highly unsteady transient signals depends on the frequency resolution (Δf) of the estimator, and each transient phenomenon corresponds to a An optimal frequency band {f, Δf}. Therefore, in the actual analysis process, the optimal frequency and frequency resolution information should be found, so that within this interval, the kurtosis reaches the maximum value, that is, the relevant transient information can be found.
[0041] Under many conditions of the pump, such as cavitation and vane deformation, etc., the vibration of the pump will change suddenly, thus generating a large amount of transient information. In this way, the fast spectral kurtosis algorithm provides a go...
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