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Method and a system for positioning acoustic emission source with unknown wave velocity in presence of abnormal TDOA and storage medium

A technology of acoustic emission source and positioning method, which is applied in the direction of radio wave measurement system, positioning, measuring device, etc., and can solve the problem that it is difficult to obtain accurate positioning results for abnormal TDOA

Active Publication Date: 2021-01-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method, system and storage medium for locating an acoustic emission source with unknown wave velocity in the presence of abnormal TDOA, so as to solve the problem that it is difficult to obtain accurate positioning results in the presence of abnormal TDOA in the existing acoustic emission source locating method

Method used

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  • Method and a system for positioning acoustic emission source with unknown wave velocity in presence of abnormal TDOA and storage medium
  • Method and a system for positioning acoustic emission source with unknown wave velocity in presence of abnormal TDOA and storage medium
  • Method and a system for positioning acoustic emission source with unknown wave velocity in presence of abnormal TDOA and storage medium

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Embodiment 1

[0091] This embodiment provides a method for locating an acoustic emission source with unknown wave velocity in the presence of abnormal TDOA, including:

[0092] Select a sensor from multiple sensors as a reference sensor, use the TDOA measurement value and the coordinates of each sensor to construct a nonlinear hyperbolic equation, and introduce two intermediate variables V and K to transform the nonlinear equation into a linear equation; , V=v 2 ,K=vr 0 , v represents the propagation velocity of the acoustic emission signal, r 0 Indicates the distance from the acoustic emission source to the reference sensor;

[0093] Set the weight of each equation in the linear equation system to 1, and solve the linear equation system to obtain the ordinary least squares solution; calculate the residual error of the equation according to the ordinary least squares solution;

[0094] Estimate the weight of the equation according to the residual of the equation, then weight the equation...

Embodiment 2

[0130] This embodiment provides a system for locating acoustic emission sources with unknown wave velocity in the presence of abnormal TDOA, including a data processing module; position.

Embodiment 3

[0132] This embodiment provides a computer-readable storage medium, which stores a computer program, and the computer program is suitable for being loaded by a processor and executing the method for locating an acoustic emission source with unknown wave velocity in the presence of abnormal TDOA as described in Embodiment 1.

[0133] Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

[0134] The present application is described wi...

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Abstract

The invention discloses a method and a system for positioning an acoustic emission source with an unknown wave velocity in the presence of abnormal TDOA, and a storage medium. The method comprises thefollowing steps of: constructing nonlinear hyperbolic equations by using TDOA measurement values and coordinates of sensors, and converting the nonlinear hyperbolic equations into a linear equation set; solving the linear equation setto obtain a common least square solution; acquiring an equation residual error through iterative weight estimation; acquiring absolute values of equation residuals to obtain absolute residuals, and sorting the absolute residuals; calculating the distances, the global distance and the local distance of absolute residual errors to obtain a global distance criterionand a local distance criterion; determining a critical residual value, if the critical residual value is greater than the critical residual value, determining that the residual is an abnormal residual, determining that the TDOA corresponding to the abnormal residual is abnormal TDOA, and eliminating the abnormal TDOA; and reconstructing a TDOA linear equation set by using the remaining normal TDOA measurement values and the corresponding sensor coordinates, and acquiring acoustic emission source coordinates. The method and the system have more robust positioning precision, which is reflectedin that abnormal TDOA can be eliminated, and the influence of the abnormal TDOA on the positioning precision is reduced; and the wave velocity does not need to be determined in advance, and the influence of wave velocity errors on positioning accuracy is eliminated.

Description

technical field [0001] The invention relates to the field of structural health monitoring, in particular to a method, system and storage medium for locating an acoustic emission source with unknown wave velocity in the presence of abnormal TDOA. Background technique [0002] As an important non-destructive monitoring technology, acoustic emission source location technology has been widely used in the research of key subjects such as mine rockburst disaster warning, structural health monitoring, material damage and failure mechanism. A high-precision AE source localization method is crucial, however, localization accuracy is easily affected by abnormal TDOA and wave velocity errors. Most of the existing localization methods can obtain relatively ideal acoustic emission source localization results in the absence of TDOA (Time Difference of Arrival) outliers. However, the actual engineering environment is often very complex, and the acoustic emission sensor is easily triggered...

Claims

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Application Information

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IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 芮艺超周子龙陆建友蔡鑫鄂昱德刘洋袁航
Owner CENT SOUTH UNIV