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Nuclear power station loosening member positioning method based on ellipsoidal surface approximate shortest path

A technology of the shortest path and positioning method, which is applied in nuclear power generation, nuclear engineering, nuclear reactor monitoring, etc., and can solve the problems of large calculation errors and low positioning accuracy

Active Publication Date: 2018-03-02
XI AN JIAOTONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the geometric structure of the actual pressure vessel is quite different from that of the flat plate and hemispherical surface.
In the positioning of loose parts of actual pressure vessels, if the propagation distance is calculated by calculating the flat or hemispherical model, due to the difference in the geometric model, the calculation error is large, so the positioning accuracy is low

Method used

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  • Nuclear power station loosening member positioning method based on ellipsoidal surface approximate shortest path
  • Nuclear power station loosening member positioning method based on ellipsoidal surface approximate shortest path
  • Nuclear power station loosening member positioning method based on ellipsoidal surface approximate shortest path

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Embodiment Construction

[0069] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0070] Such as figure 1 As shown, the method for locating loose parts of a nuclear power plant based on the approximate shortest path of an ellipsoid includes the following steps:

[0071] 1) Measure the size of the pressure vessel to obtain the semi-major axis a, b and semi-minor axis c of the ellipsoid, where a=b>c;

[0072] 2) According to the positioning accuracy requirements, divide the grid on the top and bottom of the pressure vessel, and then number the divided grids from 1 to N;

[0073] 3) Install three acceleration sensors in an equilateral triangle arrangement on the impacted object to obtain the impact signal f(t) generated when the loose part falls;

[0074] 4) Through the P coordinate of a certain grid center point, the S coordinate of an acceleration sensor and the O coordinate of the ellipsoid center, determine the ellipse plane POS where the three...

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Abstract

The invention relates to a nuclear power station loosening member positioning method based on an ellipsoidal surface approximate shortest path. Dimensions of a pressure container are measured, and semi-major axes a, b and c of an ellipsoidal surface are acquired through measurement; an elliptic plane of a grid central point P coordinate, an accelerometer S coordinate and an ellipsoidal center O coordinate are determined through the three coordinates; an included angle of the elliptic plane POS and a z axis is calculated, and a semi-minor axis d of the elliptic plane POS is calculated; a secondtype elliptic integration is called to carry out integration operation of an arc length PS of the elliptic plane POS, and the arc length PS is approximate propagation path length from the P to the S;a nuclear power station loosening member positioning method based on Hilbert transformation and data screening is further utilized to position bump points. The method is advantaged in that positioning precision is high, and the searching speed is fast.

Description

technical field [0001] The invention relates to the technical field of locating loose parts of a nuclear power plant, in particular to a method for locating loose parts of a nuclear power plant based on an ellipsoid approximating the shortest path. 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...

Claims

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Application Information

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