Principal component analysis and sequential probability ratio test-based centrifugal pump fault diagnosis method

Abstract

The invention discloses a principal component analysis and sequential probability ratio test-based centrifugal pump fault diagnosis method. The method comprises the following steps of building a modelby using a common impeller and a fault impeller, and acquiring an original vibration signal by employing a centrifugal pump vibration signal acquisition system; then, performing noise reduction on the signal by applying wavelet packet transformation, and extracting a characteristic parameter of the signal by utilizing a time domain analysis method; then, performing dimension-reduced processing onthe extracted characteristic parameter by employing a principal component analysis method, and selecting a principal component of which the contribution ratio is maximum as a test sequence; and finally, analyzing the running status of a centrifugal pump by utilizing a sequential probability ratio test algorithm and performing classification on a fault by combining with a root-mean-square algorithm. According to the method disclosed by the invention, principal component analysis and sequential probability ratio test are mainly utilized to perform fault state diagnosis, and a classification criterion is established; and the method is higher in effectiveness and accuracy in the aspects of fault diagnosis and recognition of the centrifugal pump.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, in particular to a centrifugal pump fault diagnosis method based on principal component analysis and sequential probability ratio test. Background technique [0002] With the advancement of science and technology and economic development, industrial technology develops rapidly, so the requirements for the safety and reliability of industrial production equipment are getting higher and higher. If mechanical equipment fails or shuts down, it will seriously affect production and even cause personnel damage. casualties. In order to reduce the negative impact caused by mechanical equipment failure, fault diagnosis technology is particularly important. [0003] In recent years, as a commonly used equipment in industrial production, centrifugal pumps are widely used in my country's petrochemical and other industries because they can meet production requirements such as large flow and lo...

AI Technical Summary

Problems solved by technology

During the operation of centrifugal pumps, various failures such as impeller damage and shaft damage are inevitable, which may cause casualties and major economic losses

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