Spectrum Characteristics of Acoustic Emission Signals for Sandstone Instability
Spectrum Characteristics of Acoustic Emission Signals for Sandstone Instability is a scholarly work, published in 2014 in ''Journal of Engineering Science and Technology Review''. The main subjects of the publication include coalescence, acoustics, instability, spectral density, rock mechanics, acoustic emission, baseline, mineralogy, range, geology, and earthquake prediction. In order to predict the rock rupture and instability, acoustic emission signals of natural sandstones and hydrous sandstones are analyzed through the Fast Fourier Transform and the Welch method.It is found that the acoustic emission signals of the hydrous sandstones have narrower range of frequency spectrum and lower average dominant frequencies than the natural sandstones.The dominant frequencies of the acoustic emission signals of the hydrous sandstones reduce more dramatically.In addition, two types of Welch power spectrum of the acoustic emission signals in terms of the shape are presented in this paper, which are named Type A and Type B.