Researching acoustic radiation spectrum of the mining equipment used for controlling stress state of a face space

The procedure for estimating harmonic spectrum components of vibroacoustic disturbances produced by operating equipment and sounding acoustic signals which appear during the rock failure caused by operating body of a combined machine, drilling bit, plough-type machine, pneumatic coal pick, or impact effect of a special mechanism for realizing the method of continuous control of a face space stress state with the help of spectral acoustic method was worked out. (paper)