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Variational Mode Decomposition and Resonance Demodulation Methods for Analysis of Shock Characteristics of Nuclear Power Pumps

A technology of variational mode decomposition and resonance demodulation, which is applied in the testing of mechanical components, testing of machine/structural components, instruments, etc., can solve the problem of cumbersome determination of the number of components, avoid loss, improve resolution, The effect of improving high-frequency resolution

Active Publication Date: 2021-02-26
JIANGSU UNITED CAN ELECTRONICS TECH
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Problems solved by technology

For variational mode decomposition, the center frequency is often used to determine the number of eigenmodes, but it is cumbersome to determine the number of components according to the center frequency

Method used

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  • Variational Mode Decomposition and Resonance Demodulation Methods for Analysis of Shock Characteristics of Nuclear Power Pumps
  • Variational Mode Decomposition and Resonance Demodulation Methods for Analysis of Shock Characteristics of Nuclear Power Pumps
  • Variational Mode Decomposition and Resonance Demodulation Methods for Analysis of Shock Characteristics of Nuclear Power Pumps

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Embodiment Construction

[0036] Below in conjunction with specific examples, further illustrate the present invention, the examples are implemented under the premise of the technical solutions of the present invention, it should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0037] A method for analyzing the impact characteristics of pumps used in nuclear power by variational mode decomposition and resonance demodulation mainly includes the following steps:

[0038] (1) Obtain the original signal of the fault vibration of the pump bearing used in nuclear power;

[0039] (2) Set the number of layers K of the initial eigenmode function component, perform variational mode decomposition on the original signal, and calculate the mean square error value of the eigenmode function component of each layer; use the initial eigenmode function Based on the number of component layers K, the number of eigenmode ...

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Abstract

The invention discloses a method for analyzing the impact characteristics of nuclear power pumps through variational mode decomposition and resonance demodulation. The number of decomposition layers is determined by the mean square error value of the intrinsic mode function components, and the correlation is used to reconstruct the signal. Carry out envelope analysis on the reconstructed signal, extract the characteristics of the signal, and analyze the bearing fault. The invention uses variational mode decomposition and resonance demodulation to analyze the impact characteristics of nuclear power pumps, improves the signal resolution, weakens the interference of noise and other vibration signals, improves high-frequency resolution, and avoids the loss and avoidance of fault signals Modal overlap.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of pumps used in nuclear power, and in particular relates to a method for analyzing the impact characteristics of pumps used in nuclear power through variational mode decomposition and resonance demodulation. Background technique [0002] As an important mechanical equipment in the modern nuclear power industry, nuclear power pumps are widely used in nuclear power plants. Once the nuclear power pump fails, it will cause huge economic losses. When the nuclear power pump fails, the mechanical components will collide and generate an impact signal. In the initial stage of fault generation, the fault characteristics in the low frequency band are often overwhelmed by a large amount of random noise, and it is difficult to extract the fault characteristic frequency. [0003] A large number of experts and scholars have conducted research on the failure of nuclear power pumps. The resolution of t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/045
CPCG01M13/045
Inventor 钱进马建伟陆卫金蒋同余朱玲
Owner JIANGSU UNITED CAN ELECTRONICS TECH
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