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Nuclear power plant loose part positioning method based on Hilbert transform and data screening

A positioning method and data screening technology, applied in the field of nuclear power plants, can solve problems such as heavy workload

Active Publication Date: 2015-02-25
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has high accuracy and high stability, but a relatively complete database needs to be established in the early stage, and the workload is heavy

Method used

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  • Nuclear power plant loose part positioning method based on Hilbert transform and data screening
  • Nuclear power plant loose part positioning method based on Hilbert transform and data screening
  • Nuclear power plant loose part positioning method based on Hilbert transform and data screening

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Embodiment Construction

[0052] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0053] Such as figure 1 As shown, the method for locating loose parts of nuclear power plants based on Hilbert transform and data screening includes the following steps:

[0054] 1) According to the positioning accuracy requirements, divide the grid on the impacted object, and then number the divided grids from 1 to N;

[0055] 2) Install three acceleration sensors on the object to be struck in an equilateral triangle arrangement to obtain the impact signal f(t) generated when the loose part falls;

[0056] 3) Calculate the distance difference d from each grid center point to each pair of acceleration sensors according to the geometric shape of the impacted object i,j ;

[0057] 4) The impact signal f(t) received by each acceleration sensor is collected synchronously through the data acquisition card, and the impact signal f(t) includes the impact signal s(t) and ...

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Abstract

The invention discloses a nuclear power plant loose part positioning method based on Hilbert transform and data screening. The method comprises the steps of dividing grids on an impacted object; mounting acceleration sensors; calculating a distance different between a distance from the center point of each grid to one acceleration sensor and a distance from the center point of each grid to another acceleration sensor; acquiring impact signals received by all the acceleration sensors; eliminating low-frequency noise of the signals by adopting a moving average method, and filtering environmental background noise by a Butterworth filter; performing Hilbert transform on the impact signals subjected to the noise elimination to obtain oscillation starting point moments of the impact signals; calculating a nominal transmission speed of the center point of each grid according to a transmission distance difference from the center point of the corresponding grid to the sensors and arrival time differences of all channels; and performing data screening on the nominal transmission speeds of the center points of all the grids, and calculating a variance; and finding out a minimum value in all the variances, recording coordinates of the center point, and displaying a positioning result. The nuclear power plant loose part positioning method has the advantages of high positioning precision and high searching speed.

Description

technical field [0001] The invention relates to the technical field of nuclear power plants, in particular to a method for locating loose parts of nuclear power plants based on Hilbert transformation and data screening. technical background [0002] There are a large number of screws, nuts and other connecting parts in nuclear power plants. Due to the continuous impact of high-speed water flow, they are corroded, depreciated and loosened or even dropped. There are also metal fragments entering the system from the outside during the system test, fuel supply and overhaul stages. The stability and reliability of system operation are reduced, and even the safety of the entire nuclear power plant is affected. Loose parts positioning is an important part of the loose parts detection system. Accurate positioning of loose parts is conducive to quickly finding loose parts during shutdown maintenance and making corresponding repairs, minimizing the time of maintenance personnel expose...

Claims

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Application Information

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IPC IPC(8): G21C17/00G06F19/00G01M7/08
CPCG01M7/08G21C17/00Y02E30/30
Inventor 林京罗志曾亮黄利平高飞华佳东
Owner XI AN JIAOTONG UNIV
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