Acoustic Emission Signal Recognition of Different Rocks Using Wavelet Transform and Artificial Neural Network

Table 1

Energy ratio of the wavelet transformed AE signals in failure.

Decomposition layers	CA6	CD6	CD5	CD4	CD3	CD2	CD1	Band/kHz
Frequency layers/kHz	0~78	78~156	156~312.5	312.5~625	625~1250	1250~2500	2500~5000
Energy ratio/%
Granulite	0.61645	4.7345	15.846	74.723	4.0579	0.022976	0.0018851
Granite	89.339	9.9742	0.47787	0.14506	0.016137	0.16799	0.031258
Limestone	59.835	35.511	2.4313	1.926	0.26136	0.013166	0.022664
Siltstone	52.215	44.053	3.5185	0.17952	0.011493	0.0076762	0.015349