Circle center positioning method in ultrasonic detection of shoal buried pipeline

A technology of circle center positioning and ultrasonic detection, which is applied in the field of ultrasonic detection of buried pipelines in shoals, can solve the problems of water seepage in cofferdams, unable to accurately determine the position information of pipeline edges, and must be rebuilt, etc., and achieve the effect of accurate positioning.

Active Publication Date: 2018-10-09
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] (2) If the location of the cofferdam construction deviates from the leakage site, it must be rebuilt;
[0005] (3) There are safety risks of collapse and water seepage in traditional cofferdams
[0009] The above methods can o

Method used

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  • Circle center positioning method in ultrasonic detection of shoal buried pipeline
  • Circle center positioning method in ultrasonic detection of shoal buried pipeline
  • Circle center positioning method in ultrasonic detection of shoal buried pipeline

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0050] Example 1

[0051] A method for positioning the center of a shoal buried pipeline in ultrasonic detection, which is based on the arrival time and the least square method, see figure 1 , The method for positioning the center of a circle includes the following steps:

[0052] 101: Construct a simplified bright spot model of the buried pipeline; use MATLAB to design simulation parameters to obtain simulated echo signals;

[0053] 102: Build a brief single-channel ultrasonic transmitting and receiving experimental platform in a laboratory environment;

[0054] 103: Simulate the complex environment of the shoal, add Gaussian noise with a signal-to-noise ratio of a certain threshold to the original experimental echo signal to obtain the echo signal;

[0055] 104: Use the maximum amplitude method, the characteristic parameter correlation detection method, and the fast energy center convergence method to estimate the echo signal TOA, and select the best estimation method from them;

[00...

Example Embodiment

[0075] Example 2

[0076] The following combined with the specific calculation formula, Figure 1-Figure 7 , To further introduce the scheme in Example 1, see the following description for details:

[0077] 201: Construct a simplified bright spot model of buried pipelines;

[0078] The detailed operation of this step 201 is:

[0079] 1) Such as figure 2 As shown, the position of the transducer is taken as the origin O, and the radial cross section of the pipe is taken as a two-dimensional plane (XOY plane) to construct a single underwater acoustic transducer and pipe position coordinate system. Assuming that the cross section of the pipe, that is, the circle O'as a whole is within the -3dB beam width angle of the transducer, figure 2 The middle arc edge AB is the illuminated area of ​​the sound beam, and the other arc areas are the sound shadow area.

[0080] It can be obtained from the geometric acoustic theory that the point L is the intersection of OO' and AB, which is also a the...

Example Embodiment

[0128] Example 3

[0129] The feasibility verification of the schemes in Embodiments 1 and 2 will be carried out in conjunction with specific examples and Tables 1 to 4 below. See the following description for details:

[0130] According to the circle center fitting method given in the above-mentioned Examples 1 and 2, the experimental signals are used for calculation to verify the accuracy of the proposed buried pipeline ultrasonic detection circle center positioning method. The detailed operation is:

[0131] 1) Use the experimental platform and related experimental parameters in step 201 to perform 7 repeated experiments;

[0132] 2) Use the fast energy center convergence method to compare the 7 groups of water tank experiment echo signals and simulated echo signals for TOA estimation. The results are shown in Table 1;

[0133] 3) Use the method in step 202 to fit the numerical solution of the center of the circle;

[0134] Use|δ x |,|δ y |respectively represent the error between the ...

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Abstract

The invention discloses a circle center positioning method in ultrasonic detection of a shoal buried pipeline. The circle center positioning method is based on a time of arrival and least square method, and comprises the steps of: constructing a simplified bright spot model of the buried pipeline; using a MATLAB to design simulation parameters to obtain a simulated echo signal; constructing a simple single-channel ultrasonic transmitting and receiving experimental platform in a laboratory environment; simulating a shoal complex environment, adding Gaussian noise with a signal-to-noise ratio being a certain threshold value into an original experimental echo signal to obtain an echo signal; performing echo TOA estimation on the echo signal by adopting a maximum amplitude method, a characteristic parameter correlation detection method and a fast energy center convergence method respectively, and selecting the optimal estimation method therefrom; calculating a sonic path distance between atransducer and a theoretical mirror bright spot according to the simplified bright spot model and echo TOA estimation; and fitting a pipeline circle center objective function according to the sonic path distance and calculating an approximate numerical solution, taking the approximate numerical solution as initial coordinates, and calculating a precise solution of the circle center of the pipeline through iterative operation.

Description

technical field [0001] The invention relates to the field of ultrasonic detection of buried pipelines in shoals, in particular to a method for locating the center of pipelines based on time of arrival and the least square method. Background technique [0002] Long oil pipelines buried in shoal areas (rivers, swamps, ponds, rice fields, etc.) are generally laid below 1 to 2 meters of soil. After a leakage accident, conventional pipeline repair cofferdam operations usually have the following three deficiencies: [0003] (1) The scope of cofferdam construction is much larger than the actual required operation area; [0004] (2) If the location of the cofferdam construction deviates from the leakage site, it must be rebuilt; [0005] (3) There are safety risks of collapse and water seepage in traditional cofferdams. [0006] Therefore, if there is an automatic and intelligent machine equipment in cofferdam repair work for oil pipeline leakage, it can accurately locate the pos...

Claims

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Application Information

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IPC IPC(8): G01S15/88G01S7/539F17D5/06
CPCF17D5/06G01S7/539G01S15/88
Inventor 白志亮陈世利谢思捷曾周末
Owner TIANJIN UNIV
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