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Rock mass acoustic emission first arrival self-adaptive identification method

An identification method and self-adaptive technology, which is applied in the direction of material analysis using acoustic wave emission technology, can solve problems such as wrong picking results, lack of robustness, and inability to monitor adaptive changes in signals, achieving the effect of strong adaptability and accuracy

Active Publication Date: 2021-04-13
CENT SOUTH UNIV
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  • Description
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Problems solved by technology

However, in many current methods, the characteristic function depends on the preset, and cannot be adaptively changed according to the monitoring signal itself. It lacks sufficient robustness, and it is easy to cause errors in the picking results in low signal-to-noise ratio or high-frequency noise environments.

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  • Rock mass acoustic emission first arrival self-adaptive identification method
  • Rock mass acoustic emission first arrival self-adaptive identification method
  • Rock mass acoustic emission first arrival self-adaptive identification method

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Embodiment Construction

[0058] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention. in, figure 1 , Figure 5 , Figure 6 to Figure 11 The abscissa Time in is the time, and the ordinate Amplitude is the amplitude.

[0059] Such as figure 2 and image 3 As shown, the present invention provides a method for first-arrival adaptive recognition of rock mass acoustic emission, comprising the following steps:

[0060] S1. Obtain the envelope curve of the monitoring signal

[0061] The change of waveform amplitude is an important basis for identifying the first arrival by artificial method and STA / LTA method, such as figure 1 As shown, the amplitude change of the waveform can be reflected by the waveform envelope of the signal. There is a clear di...

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Abstract

The invention relates to an acoustic emission first arrival pickup method, and discloses a rock mass acoustic emission first arrival self-adaptive identification method. The method comprises the following steps of S1, obtaining an envelope curve of a monitoring signal; S2, determining an envelope period of the monitoring signal; S3, removing periodic changes and abnormal values from the envelope curve to obtain a trend curve; and S4, judging the trend curve through a judgment curve so as to automatically identify an acoustic emission first arrival point. The method can automatically judge whether the monitoring signal has acoustic emission or not and automatically identify the acoustic emission first arrival, and is high in adaptability to first arrival pickup and high in accuracy.

Description

technical field [0001] The invention relates to a method for picking up acoustic emission first arrivals, in particular to an adaptive recognition method for acoustic emission first arrivals of a rock mass. Background technique [0002] In recent years, rock mass emission monitoring technology has been widely used in ground pressure monitoring. The main research contents of corresponding acoustic emission monitoring information analysis include waveform identification, first arrival pickup, sound source location, parameter analysis, waveform inversion, etc. Among them, first-arrival pickup is the most basic and important step in sound source localization and ground pressure hazard early warning and forecasting. In the real-time monitoring of acoustic emission, the amount of data is huge and complex, and manual identification is difficult to apply, while the threshold method used more often lacks flexibility and has low accuracy. For this reason, various first-arrival identi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/14
CPCG01N29/14
Inventor 谢学斌叶永飞王小平刘涛姜伟张欢赵伟李少乾高山
Owner CENT SOUTH UNIV
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