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Acoustic emission source location method, system and storage medium with unknown wave velocity in the presence of abnormal tdoa

An acoustic emission source and positioning method technology, applied in radio wave measurement systems, positioning, instruments, etc., can solve problems such as the difficulty of obtaining accurate positioning results for abnormal TDOA, and achieve the goals of avoiding slow convergence, robust positioning accuracy, and reducing impact Effect

Active Publication Date: 2022-05-06
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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  • Acoustic emission source location method, system and storage medium with unknown wave velocity in the presence of abnormal tdoa
  • Acoustic emission source location method, system and storage medium with unknown wave velocity in the presence of abnormal tdoa
  • Acoustic emission source location method, system and storage medium with unknown wave velocity in the presence of abnormal tdoa

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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, system and storage medium for locating an acoustic emission source with unknown wave velocity in the presence of abnormal TDOA. Ordinary least squares solution; obtain equation residuals by iterative weight estimation; take absolute value of equation residuals to obtain absolute residuals and sort; calculate the distance, global distance and local distance of each absolute residual to obtain global distance and local distance judgment According to; determine the critical residual value, greater than the critical residual value is the abnormal residual, and the TDOA corresponding to the abnormal residual is abnormal TDOA, and exclude it; use the remaining normal TDOA measurement value and the corresponding sensor coordinates to reconstruct the TDOA linear equation group , and obtain the coordinates of the acoustic emission source. This scheme has more robust positioning accuracy, which is reflected in the fact that abnormal TDOA can be eliminated and its impact on positioning accuracy can be reduced; there is no need to pre-determine the wave velocity, and the influence of wave velocity error 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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Patent Type & Authority Patents(China)
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