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Method and device for processing vibration signal of loose part of nuclear power plant

A technology of vibration signal and loose parts, applied in the field of nuclear engineering, can solve the problem of high false alarm rate, and achieve the effect of eliminating noise and interference, and making the vibration signal reliable and stable.

Inactive Publication Date: 2017-02-15
中广核工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problem that the low-pass or band-pass filter method is used in the existing nuclear power plant instrument control system to reduce the noise-containing vibration signal collected by the loose parts monitoring system, and the false alarm rate is high, and provides a nuclear power plant Method and device for processing vibration signal of loose parts in factory

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  • Method and device for processing vibration signal of loose part of nuclear power plant
  • Method and device for processing vibration signal of loose part of nuclear power plant
  • Method and device for processing vibration signal of loose part of nuclear power plant

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Embodiment 1

[0042] A method for processing vibration signals of loose parts of a nuclear power plant provided by the present invention, see figure 1 , the method includes:

[0043] S1. Collect actual noise-containing vibration signals of loose parts of the nuclear power plant.

[0044] Specifically, two channels of noisy vibration signals need to be collected. At time t, the first noisy vibration signal x(t) is collected. After time τ, the second noise-containing vibration signal x(t+τ) is collected. The two noise-containing vibration signals collected come from the same mechanical system. There is a certain connotation of physical connection between them.

[0045] The first noisy vibration signal x(t) can be expressed as:

[0046]

[0047] in, is the vibration signal to be measured, n(t) is the noise signal, A is the amplitude, ω=2πf, f is the frequency, is the initial phase.

[0048] Correspondingly, the second noisy vibration signal x(t+τ) can be expressed as:

[0049] x(t...

Embodiment 2

[0075] The present invention also provides a processing device for vibration signals of loose parts of a nuclear power plant, see figure 2 , the device includes: a signal acquisition module 1, installed on the nuclear reactor, used to acquire the actual noise-containing vibration signal of the loose parts of the nuclear power plant.

[0076] The signal acquisition module 1 includes a piezoelectric acceleration sensor 11 . It can be understood that there may be multiple piezoelectric acceleration sensors 11 . Specifically, the piezoelectric acceleration sensor 11 is installed on the pressure boundary of the primary circuit of the nuclear power plant. There may be some metal objects in the pressure boundary of the primary circuit, such as fallen bolts, screws, etc. These detached parts will hit the boundary of the primary circuit along with the flow of the liquid in the pipeline, and the impact pressure will cause the capacitance on the piezoelectric acceleration sensor 11 to...

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Abstract

The invention discloses a method and a device for processing a vibration signal of a loose part of a nuclear power plant, and belongs to the technical field of nuclear engineering. The method comprises the steps: acquiring an actual noised vibration signal of the loose part of the nuclear power plant; performing self-correlation operation on the noised vibration signal, decomposing to obtain a self-correlation function of the vibration signal, a self-correlation function of noise and a mutual-correlation function of the vibration signal and the noise so as to realize primary de-noising treatment on the noised vibration signal and obtain the noised vibration signal subjected to de-noising treatment; and performing wavelet de-noising treatment on the noised vibration signal subjected to de-noising treatment and performing wavelet inverse treatment on the noised vibration signal subjected to wavelet de-noising treatment so as to reconstruct the signal. According to the method and the device, various noise and interference superposed on the tested signals are eliminated as much as possible under the strong noise interference condition, and the reliability and the stability of the acquired vibration signal are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of nuclear engineering, and in particular relates to a method and a device for processing vibration signals of loose parts of a nuclear power plant. Background technique [0002] The interior of the nuclear reactor pressure vessel includes reactor internals and fuel assemblies. The reactor internals are mainly composed of compression assemblies, basket assemblies, and under-core support assemblies. Most of the components and parts in each assembly are connected by screws and pins. Although these connectors have been designed with anti-loosening and anti-loosening measures, under the long-term continuous operation of the reactor, due to the impact of water flow and flow-induced vibration, some parts may become loose or even fall off, so that in the primary circuit form loose parts. At the same time, during construction, refueling or maintenance, there is also the possibility of leaving metal parts in the pri...

Claims

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Application Information

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IPC IPC(8): G21C13/02G21C17/00
CPCG21C13/02G21C17/00Y02E30/30
Inventor 袁超惠志光吕建平陈冬雷江辉何国伟刘全忠史觊刘东波丁丁
Owner 中广核工程有限公司
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