A method for locating microseismic sources or acoustic emission sources based on nonlinear fitting

A nonlinear fitting and acoustic emission source technology, which is applied in the field of positioning of microseismic sources or acoustic emission sources based on nonlinear fitting, and can solve the problems of system positioning error and inability to eliminate the influence of velocity measurement deviation.

Active Publication Date: 2011-11-30
CENT SOUTH UNIV
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Problems solved by technology

The propagation speed of the wave is affected by factors such as the material, size and surface state of the propagation medium. When the input speed is different from the real speed in the measured object, especially for the complexity of the rock medium, it will bring errors to the system positioning. In addition, The measured sound velocity is also greatly affected by the size of the probe spacing
[0004] In short, in the current acoustic emission instrument and microseismic positioning system, the influence of velocity measurement deviation on positioning cannot be eliminated.
In order to solve this problem, it is necessary to propose a new method of non-linear positioning without measuring speed, which can avoid the influence of measuring speed on positioning

Method used

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  • A method for locating microseismic sources or acoustic emission sources based on nonlinear fitting
  • A method for locating microseismic sources or acoustic emission sources based on nonlinear fitting
  • A method for locating microseismic sources or acoustic emission sources based on nonlinear fitting

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Embodiment 1

[0031] Such as figure 1 As shown, the preset position of a microseismic source / acoustic emission source is (200m, 300m, 600m), and the coordinates of the five sensors (x 1 ,y 1 ,z 1 ), (x 2 ,y 2 ,z 2 ), (x 3 ,y 3 ,z 3 ), (x 4 ,y 4 ,z 4 ) and (x 5 ,y 5 ,z 5 ) are (0, 0, 0), (800, 0, 0), (800, 800, 0), (0, 800, 0), (0, 0, 800) respectively, and the unit is m. Let the wave speeds of P and S waves be 5600m / s and 3100m / s respectively. The times when the P wave triggered the above sensors were 0.125, 0.175872, 0.143969, and 0.073627 seconds; the times when the S waves triggered the above sensors were 0.225806, 0.290323, 0.317705, 0.260073, and 0.133003 seconds.

[0032] Take this example to explain the three-dimensional positioning problem in detail. In the actual positioning, the known quantities are the coordinates of the five sensors and the moment when the sensor triggers the recording. The position of the microseismic source / acoustic emission source is unknown. T...

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Abstract

The invention discloses a positioning method based on a non-linear fitting micro-seismic source or acoustic emission source. The method is characterized in that: a plurality of acoustic emission sensors are installed near an object to be measured, according to a coordinate figure of a known sensor position and P, S wave arriving time, and according to a distance operation formula and P, S wave speed and time relations, a position coordinate of a micro-seismic source or acoustic emission source is obtained through a non-linear least square regression method like an acceleration simplex method or a Marquardt method. According to the positioning method based on a non-linear fitting micro-seismic source or acoustic emission source, measuring a speed or setting a given speed in advance is not needed, influence to positioning caused by acoustic velocity measurement can be avoided, and positioning precision is raised. The method is convenient and practical in practical engineering application compared with a traditional method.

Description

technical field [0001] The invention relates to a positioning method of a microseismic source or an acoustic emission source based on nonlinear fitting. Background technique [0002] How to accurately locate the source of material damage or the accompanying microseismic / acoustic emission in the early stage of rockburst is very important. The source localization technology of microseismic / acoustic emission is one of the core issues in the research of acoustic emission technology, and its positioning accuracy reflects the degree of conformity between the detected position of the sound source and the real position. [0003] Many scientific workers have done a lot of research on the source location of acoustic emission, and proposed many source location methods for acoustic emission, such as the location method based on modal analysis and wavelet transform, and the location method based on neuron network system, etc., but At present, the positioning of acoustic emission instrum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/20
Inventor 李夕兵董陇军唐礼忠宫凤强殷志强严鹏
Owner CENT SOUTH UNIV
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