河南理工大学学报（自然科学版）2018，Vol.37Issue(2)：1-7,7.DOI:10.16186/j.cnki.1673-9787.2018.02.001
基于小波包变换的煤样破裂次声信号频率特征分析
Analysis of frequency characteristics of infrasonic signals in coal specimens burst based on wavelet packet transform
摘要
Abstract
Infrasonic wave technology is expected to become a new method to monitor and warn the dynamic disasters of coal and rock in coal mine,and the frequency characteristics of infrasonic signal are the key parameters of application research.Through the uniaxial compression test of coal specimens,the infrasonic signal monitoring system is used to collect the signals produced by the coal specimen in the process of deformation and fracture.The energy distribution characteristics of the signal were analyzed by means of wavelet packet transform.The experiment results show:(1) Wavelet packet transform can fine signal segmentation into each frequency band,and can play an role in filtering,the frequency range of the analysis.(2)There is a good correspondence between the infrasonic signals of coal specimen burst and the stress in the time,especially the infrasonic signal shows a significant mutation during stress drop.The stress drop reflects the emergence of macroscopic cracks to some extent,indicating that infrasonic signal has a good sensitivity to macroscopic cracks.(3) The frequency of the infrasonic signals of coal specimen burst are all distributed in 0 ～ 20 Hz,but mainly in 3.125 ～ 12.5 Hz and 18.75 ～ 21.875 Hz.The signal analysis method with wavelet packet transform and the frequency characteristics of the infrasonic signals of coal specimen burst can provide the study basis and reference for further research.关键词
次声波/小波包变换/单轴压缩/煤岩动力灾害Key words
infrasonic wave/wavelet packet transform/uniaxial compression/coal or rock dynamic disaster分类
建筑与水利引用本文复制引用
王云刚,王庆军,魏建平,雷东记..基于小波包变换的煤样破裂次声信号频率特征分析[J].河南理工大学学报（自然科学版）,2018,37(2):1-7,7.基金项目
国家自然科学基金资助项目(51574112,U1704129) （51574112,U1704129）
教育部创新团队发展计划项目(IRT-16R22) （IRT-16R22）
教育部科学技术研究重点项目(213022A) （213022A）
河南省科技创新杰出青年项目(164100510013) （164100510013）
河南省科技厅基础与前沿研究项目(152300410210) （152300410210）
