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

A technology of sequential probability ratio and fault diagnosis, applied in pump control, non-variable-capacity pumps, machines/engines, etc., can solve problems such as casualties and economic losses, achieve good noise reduction, high accuracy, and useful information accurate effect

Inactive Publication Date: 2019-08-23
WUHAN INSTITUTE OF TECHNOLOGY
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Problems solved by technology

During the operation of centrifugal pumps, various failures such as impeller dama...

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

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Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] Such as figure 1 As shown, it is a schematic flow chart of a specific embodiment of a centrifugal pump fault diagnosis method based on the PCA-SPRT algorithm, including the following steps:

[0033] S1: The experimental model is established by using the ordinary impeller and the faulty impeller, and the original vibration signal is obtained by the vibration signal acquisition system of the centrifugal pump.

[0034] Specifically, the present invention selects Weir / Warman 3 / 2 CAH centrifugal pump. The impeller is closed, the model is C2147, and it is driven by a motor with a rated power...

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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...

Claims

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Application Information

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IPC IPC(8): F04D15/00
CPCF04D15/0088F05D2260/80F05D2260/81
Inventor 陈汉新苗育茁范东亮方璐黄浪柯耀王琪杨柳
Owner WUHAN INSTITUTE OF TECHNOLOGY
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