Analysis of acoustic emission signals in geomaterial specimens during uniaxial compression
The paper presents the results of analysis of acoustic emission signals, monitoring of which is used in study of the processes of rock deformation at various stages of destruction during laboratory experiments on uniaxial compression in Laboratory Energy-Saturated Media Simulation of Research Station of the Russian Academy of Sciences in Bishkek. Registered acoustic emission signals are waveforms of various types: useful signals, noise, and their combinations, differing in both amplitude-frequency spectrum and signal power. The developed method of preliminary processing of acoustic emission data uses these features of the acoustic emission waveforms, as well as their amplitude-frequency spectra to calculate the criteria (P1, P2) for the rejection of noise components. It allows automated extraction of useful acoustic emission signals from the total data set based on histograms and scatterplot of P1, P2 parameters, which has the regions, grouped into separate clusters, corresponding to useful and noisy acoustic emission signals. The regions selected in this way are used for the subsequent calculation of accumulative number of acoustic emission events that describes dynamics of the process of rock samples destruction.