VMD and Wigner-Ville based high pressure diaphragm pump check valve fault diagnosis method

A pump check valve and high-pressure diaphragm technology, which is used in mechanical valve testing, mechanical component testing, and machine/structural component testing. Obfuscation problem, improved time-frequency aggregation performance, and the effect of improving accuracy

Inactive Publication Date: 2019-01-29
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is aimed at the problem that the fault feature information is difficult to extract in the fault diagnosis of the high-pressure diaphragm pump check valve, and proposes a fault diagnosis method for the high-pressure diaphragm pump check valve based on VMD and Wigner-Ville to realize the high-pressure diaphragm pump check valve Fault Feature Extraction and Fault Diagnosis

Method used

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  • VMD and Wigner-Ville based high pressure diaphragm pump check valve fault diagnosis method
  • VMD and Wigner-Ville based high pressure diaphragm pump check valve fault diagnosis method
  • VMD and Wigner-Ville based high pressure diaphragm pump check valve fault diagnosis method

Examples

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Embodiment 1

[0057] Example 1: The No. 3 high-pressure diaphragm pump of the Yunnan Dahongshan Tiejing pipeline is used for verification. It is a three-cylinder crankshaft-driven piston piston pump of the TZPM series. The maximum working pressure is 24.44Mpa. The feed check valve and the feed check valve are arranged with vibration acceleration sensors whose model is PCB-ICP, the adopted frequency is 2560Hz, and the adopted data length is 10240. The data used are the vibration signals of the normal operation of the check valve, the wear and breakdown of the check valve, and the vibration signals of the coarse particle stuck in the check valve.

[0058] A kind of high-pressure diaphragm pump check valve fault diagnosis method based on VMD and Wigner-Ville of the present invention, such as figure 1 As shown, the specific steps are as follows:

[0059] (1) Three kinds of vibration signals, namely check valve wear and breakdown fault, coarse particle sticking fault and normal state, are selec...

example 2

[0098] Example 2: In order to analyze the effectiveness of this method, a multi-point AM and FM simulation signal is established, and its analytical expression is:

[0099]

[0100] In the simulation signal (0≤t≤3), the frequency of x(t) is 2560Hz, and the data length is 10240. The process of the method is as follows figure 1 Shown:

[0101] (1) Use VMD to decompose the simulation signal, such as Image 6 shown;

[0102] (2) Based on the center frequency observation method, the IMF component rich in fault information is screened. When m=4, it is decomposed into four modal functions, and the center frequency 0.012 corresponding to the fourth modal function is the same as the third mode The center frequency 0.0046 corresponding to the function has a different series, the ratio of the two is 2.61, and when m=5, five modal functions are decomposed, the center frequency of the fifth modal function is 0.019 and the fourth modal function The series of center frequency 0.012 is ...

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Abstract

The invention discloses a VMD and Wigner-Ville based high pressure diaphragm pump check valve fault diagnosis method. The method includes: using an acceleration sensor to acquire vibration signals ofa high-pressure diaphragm pump check valve in a fault state and a normal state, and then adopting a VMD method to decompose the acquired signals in each state, and then selecting IMF components basedon a center frequency observation method for k-modal components of a fault vibration signal and a normal vibration signal; calculating the Wigner-Ville distribution of each selected IMF component; linearly superimposing the Wigner-Ville distribution results of each modal component to obtain the Wigner-Ville distribution of the fault and normal vibration signals; acquiring the vibration signals ofthe high pressure diaphragm pump check valve, comparing the vibration signals with the Wigner-Ville distribution of the fault vibration signal and the normal vibration signal, and extracting fault features; and diagnosing the fault. The method realizes the comprehensive and effective characterization of the state information of the check valve, and effectively achieves fault diagnosis of the high-pressure diaphragm pump check valve.

Description

technical field [0001] The invention relates to a fault diagnosis method for a check valve of a high-pressure diaphragm pump based on VMD and Wigner-Ville, belonging to the field of fault diagnosis of a high-pressure diaphragm pump. Background technique [0002] The reciprocating high-pressure diaphragm pump is a long-distance, high-lift core power equipment for transporting high-temperature, highly corrosive solid-liquid two-phase media. As one of the core mechanical parts of the high-pressure diaphragm pump, the working state of the check valve directly affects the overall performance and working efficiency of the equipment, and it is easily stimulated by various types of vibration sources such as reciprocating motion, rotational motion, and fluid motion during operation. , making the vibration signal of the one-way valve very complicated, resulting in the failure of the one-way valve with the characteristics of suddenness, concurrency, multi-source, non-stationary and non...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/003
CPCG01M13/00
Inventor 黄国勇吴漫吴建德王晓东叶波范玉刚邹金慧冯早
Owner KUNMING UNIV OF SCI & TECH
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