Sustainability 2017, 9(7), 1209; https://doi.org/10.3390/su9071209
A Novel Study of Waveguide Propagation Rules of Coal Rock AE Signal: Effects of Waveguide Size and Installation Method on the Propagation Rules of Coal Rock AE Signal
1
School of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
2
Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, Xi’an 710054, China
3
China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400037, China
4
National Key Laboratory of Gas Disaster Monitoring, Preventing and Emergency Controlling, Chongqing 400037, China
*
Author to whom correspondence should be addressed.
Received: 13 June 2017 / Revised: 26 June 2017 / Accepted: 29 June 2017 / Published: 10 July 2017
(This article belongs to the Special Issue Energy Security and Sustainability)
Abstract
The propagation of acoustic emission (AE) signal in waveguide is quite important for AE-based prediction of dynamic disasters in coal rocks. In this study, based on some relevant theories in wave mechanics, the elastic mechanical model of one-dimensional (1D) waveguide was firstly established, and the relationship between AE source signal and the signal at the waveguide’s receiving end was derived. On the basis of theoretical analysis, numerical simulation and laboratory test schemes were designed; additionally, using the standard vibration source method, AE response in different sizes of waveguides were investigated, the effects of waveguide size of waveguide were concluded, and the application conditions of the established theoretical model were clarified. Numerical simulation results fit well with the laboratory test results. Meanwhile, the effects of the sensor’s installation method on the propagation rules of AE signal were examined and appropriate installation method was determined. View Full-TextKeywords:
coal rock; acoustic emission signal; waveguide; size; installation method; propagation rule
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Dong, G.; Zou, Y. A Novel Study of Waveguide Propagation Rules of Coal Rock AE Signal: Effects of Waveguide Size and Installation Method on the Propagation Rules of Coal Rock AE Signal. Sustainability 2017, 9, 1209.
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