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Method and device for detecting and analyzing multiband acoustic emission of rock fragile materials

An acoustic emission detection and brittle material technology, which is applied in the field of mine and underground geotechnical engineering detection, can solve problems such as inability to accurately judge materials, cracks and uneven microstructure, and complexity of instability conditions, and achieves accuracy and reliability. positive effect

Inactive Publication Date: 2011-02-16
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

However, due to the fact that the material contains many defects of different nature, cracks and inhomogeneity in the microstructure, it leads to the complexity of the instability condition of the material, or the detection and analysis of the acoustic emission signal in the fixed frequency band cannot accurately judge the material critical condition for fracture

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Embodiment Construction

[0025] The detection and analysis method and device of the present invention are described in detail below:

[0026] The multi-band acoustic emission signal detection and analysis method of the present invention is carried out according to the following steps:

[0027] (1) According to the inherent heterogeneity characteristics of rock materials, multiple frequency band selections for acoustic emission detection are performed on the frequency distribution characteristics of the acoustic emission signals released by the material itself;

[0028] (2) Use optimized and selected sensors with different dominant frequencies to form a sensor group for detection, and at the same time obtain the signal characteristics of multiple different frequency bands of the same acoustic emission signal source;

[0029] (3) Simultaneously analyze the obtained signals in different frequency bands to obtain corresponding signal characteristics;

[0030] (4) Through the characteristics of acoustic e...

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Abstract

The invention relates to a method for detecting and analyzing acoustic emission signals and a multiband acoustic emission detector based on multiband and is suitable for the rock fragile materials. The multiband acoustic emission detector comprises a group of two or more than two sensors with different dominant frequencies; each sensor is connected with a signal amplifying device and a signal acquisition device; the signal acquisition device is connected with a computer; multiband selection of the acoustic emission detection is carried out on the frequency distribution characteristics of the acoustic emission signal released by the material according to the heterogeneity characteristic inhered in the rock fragile material; and the acquired signals with different frequent bands are analyzed to acquire the corresponding signal characteristics, thus improving the accuracy and the reliability of judging the unstable critical condition of the damaged materials.

Description

technical field [0001] The invention belongs to the technical field of mine and underground geotechnical engineering detection, and in particular relates to a method and device for detecting and analyzing rock brittle materials based on multi-band acoustic emission signals. Background technique [0002] Due to the heterogeneous characteristics of rock-like brittle materials, the fracture process under load is actually a continuous process from primary cracks to micro-cracks, and finally to macro-fractures. Acoustic emission is produced, and has different acoustic emission characteristics at different stages, and the acoustic emission process does contain different information of different states in the material fracture process, so through the detection and analysis of the acoustic emission in the process of material stress, Realize the discrimination and prediction of material damage and instability. [0003] The detection and analysis of acoustic emission in the prior art...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/14
Inventor 纪洪广侯昭飞周煜张月征向鹏杨振颢
Owner UNIV OF SCI & TECH BEIJING
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