Centrifugal pump fault diagnosis method based on self-search characteristic peak value and local range

Abstract

The invention discloses a centrifugal pump fault diagnosis method based on a self-search characteristic peak value and a local range. The centrifugal pump fault diagnosis method comprises the following steps: firstly obtaining a vibration signal and a three-phase current signal of a centrifugal pump; automatically searching the rotating frequency of the centrifugal pump within the rated rotating frequency according to the peak value of the power spectrum; then constructing a self-search frequency conversion peak value index by using the vibration signal after low-pass filtering, constructing a self-search characteristic frequency peak value index by using the vibration signal after band-pass filtering and db10 wavelet decomposition, and constructing a current local range index by using the current signal; respectively setting corresponding threshold values, and outputting a diagnosis result by comparing the extracted indexes with the set threshold values, so as to realize automatic diagnosis of the fault of the centrifugal pump. According to the characteristics of the vibration signal and the current signal of the centrifugal pump, indexes are constructed respectively, the defects that a traditional method needs manual judgment, excessively depends on experts and priori knowledge, wastes time and labor and is prone to state misjudgment are overcome, automatic fault diagnosis of the centrifugal pump can be achieved, and the efficiency and accuracy of fault diagnosis of the centrifugal pump are improved.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of centrifugal pumps, and in particular relates to a fault diagnosis method of centrifugal pumps based on self-searching characteristic peak values ​​and local extreme differences. Background technique [0002] Centrifugal pumps have been widely used in the fields of machinery, petrochemical, and national defense industries due to their simple structure, stable performance, convenient maintenance, and low price. However, centrifugal pumps often work under harsh conditions of high temperature and high speed. With the increase of service time, the performance of centrifugal pumps will be significantly degraded, resulting in frequent failures, and the medium transported by centrifugal pumps in engineering practice is generally toxic. , Corrosive, flammable and explosive, etc. If the failure of the centrifugal pump cannot be diagnosed in a timely and effective manner, it will cause major accid...

AI Technical Summary

Problems solved by technology

The above method requires manual judgment and relies too much on experts and prior knowledge. It is time-consuming and labor-intensive, and is prone to state misjudgment, which greatly increases the difficulty of maintenance and makes it difficult to efficiently and accurately identify centrifugal pump faults.

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