Time-Frequency Characteristics of Acoustic Emission Signals on Water-Bearing Sandstone Specimen Subjected to Conventional Uniaxial Compression

Table 3

Energy proportion in each frequency band near three key points.

Frequency band number	Frequency band range (kHz)		Energy proportion (%)
		Key point “A”	Key point “B”	Key point “C”
1	0~62.5	33.9	22.12	22.54
2	62.5~125	46.02	50.23	56.41
3	125~187.5	15.89	23.3	16.48
4	187.5~250	2.34	1.93	2.08
5	250~312.5	0.44	0.39	0.48
6	312.5~375	0.57	1.35	0.84
7	375~437.5	0.35	0.35	0.6
8	437.5~500	0.49	0.33	0.57