Centrifugal Pump Fault Diagnosis Method Based on Self-searching Characteristic Peak and Local Range

Abstract

The centrifugal pump fault diagnosis method based on self-searching characteristic peak value and local extreme difference, first obtains the vibration signal and three-phase current signal of the centrifugal pump; secondly searches the centrifugal pump rotational frequency automatically according to the power spectrum peak within the rated rotational frequency; then uses the low-pass The filtered vibration signal is used to construct the self-searching frequency peak index, the vibration signal after band-pass filtering and db10 wavelet decomposition is used to construct the self-searching characteristic frequency peak index, and the current signal is used to construct the current local range index; respectively set the corresponding threshold, And output the diagnostic result by comparing the extracted index with the set threshold value, so as to realize the automatic diagnosis of the centrifugal pump fault; the present invention aims at the characteristics of the vibration signal and current signal of the centrifugal pump, respectively constructs the index, overcomes the traditional method that requires manual judgment and is too Relying on experts and prior knowledge, time-consuming and labor-intensive and prone to state misjudgment defects, it can realize automatic fault diagnosis of centrifugal pumps, which improves the efficiency and accuracy of centrifugal pump fault diagnosis.

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...

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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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