Rock failure acoustic emission sub-dominant frequency identification and extraction method

• Main Authors: CHENG HAIYONG, WANG TAO, ZHANG XIAOQIANG, WU SHUNCHUAN, CHANG XINKE
• Format: Patent
• Language: Chinese; English
• Published: 18.02.2022
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention relates to a rock failure acoustic emission sub-dominant frequency identification and extraction method. Standard cylindrical samples of rocks with different geological causes are prepared, acoustic emission sensors are uniformly arranged on the side surfaces of the standard cylindrical samples in the circumferential direction, a uniaxial compression experiment is carried out, and the acoustic emission sensors receive original acoustic emission waveforms released in the whole process from the beginning of loading to complete destruction of the rock samples, de-noising processing and fast Fourier transform are carried out on the original acoustic emission waveform in sequence to obtain a two-dimensional spectrogram, and fuzzification processing is carried out to obtain a fuzzified two-dimensional spectrogram; an acoustic emission signal with a secondary dominant frequency characteristic is captured and identified, and an acoustic emission dominant frequency and a secondary dominant frequency of t