Shock and Vibration / 2018 / Article / Tab 3

Research Article

Investigation of Relation between Fracture Scale and Acoustic Emission Time-Frequency Parameters in Rocks

Table 3

Corresponding acoustic emission characteristics of different fracture scale cracks.

Crack scale valueTypes of AE signal Dominant frequency/khzAbsolute energy/aJ

Large scale cracks0.6648Low frequency and high energyLow frequency
(41 khz, 92 khz, and 103 khz)
High energy (1.15 × 109)
Small scale cracks0.4028Medium/high frequency and low energyMedium/high frequency
(150 khz, 175 khz, and 275 khz)
Low energy (9.20 × 106)