Energy characteristics of AE signal frequency band during coal rupture in mines with gas

中国安全科学学报 Pub Date : 2020-03-28 DOI:10.16265/J.CNKI.ISSN1003-3033.2020.03.018

Zhao Aohan, Ma Yankun, Liu Jian, Chen Dezhong, Yuan Hongyong, Fu Ming

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引用次数: 2

Abstract

In order to analyze gas's influence on AE band energy during coal rupture under loadingꎬ with structural coal as research objectꎬ uni ̄axial compression test was carried out by using self ̄developed gas ̄ containing coal test device. Thenꎬ signal processing method of fast Fourier transform (FFT) and wavelet packet analysis was used to obtain characteristics of AE band energy during coal rupture under different gas 中国安全科学学报 China Safety Science Journal 第30卷 2020年 pressure. The results show that the greater gas pressure isꎬ the larger main frequency of AE signal isꎬ the narrower frequency band isꎬ and spectrum transforms gradually from a complex multi ̄peak form to a single peak form. When three is gasꎬ with the increase of loading stressꎬ frequency band enriches and spectrum shifts to left gradually. As gas pressure changesꎬ energy of 2􀆰 92-4􀆰 38 kHzꎬ 4􀆰 38-5􀆰 84 and 7􀆰 3-8􀆰 76 kHz changes significantly while that in 2􀆰 92-4􀆰 38 kHz is basically same as the sum of 4􀆰 38-5􀆰 84 and 7􀆰 3-8􀆰 76 kHzꎬ showing an opposite trend. When stress of structural coal increasesꎬ 4􀆰 38-5􀆰 84 and 7􀆰 38􀆰 76 kHz indicate the largest increase and decrease of energy respectively. 2􀆰 92-4􀆰 38 kHz and 4􀆰 385􀆰 84 kHz can be used as characteristic frequency bands to study damage of structural coal under loading in mines with gas.

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含瓦斯矿井煤层破裂声发射信号频带能量特征

为了分析ꎬ加载下瓦斯对煤破裂声发射波段能量的影响，以结构煤为研究对象，利用自行研制的含瓦斯煤试验装置ꎬ进行了单轴压缩试验。然后采用快速傅里叶变换(FFT)和小波包分析的ꎬ信号处理方法，得到不同气体压力下煤破裂声发射波段能量特征。结果表明:气体压力ꎬ越大，声发射信号主频率ꎬ越大，频带ꎬ越窄，频谱由复杂的多峰形式逐渐转变为单峰形式;三是气体ꎬ随着加载应力的增大，ꎬ频带逐渐丰富，频谱逐渐左移。气体压力变化ꎬ能量2􀆰92 - 4􀆰38 kHzꎬ􀆰38-5􀆰84和7􀆰3 - 8􀆰76 kHz变化显著,92 - 4􀆰􀆰38 kHz基本上是一样的和4􀆰38-5􀆰84和7􀆰3 - 8􀆰76 kHzꎬ表现出相反的趋势。当结构煤应力增大时，ꎬ4􀆰38-5􀆰84和7􀆰38􀆰76 kHz分别表示能量的最大增加和最大减少。2􀆰92-4􀆰38 kHz和4􀆰385􀆰84 kHz可作为含瓦斯矿井结构煤在荷载作用下损伤研究的特征频段。

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来源期刊

中国安全科学学报

CiteScore

1.30

自引率

0.00%

发文量

8733

期刊介绍： China Safety Science Journal is administered by China Association for Science and Technology and sponsored by China Occupational Safety and Health Association (formerly China Society of Science and Technology for Labor Protection). It was first published on January 20, 1991 and was approved for public distribution at home and abroad. China Safety Science Journal (CN 11-2865/X ISSN 1003-3033 CODEN ZAKXAM) is a monthly magazine, 12 issues a year, large 16 folo, the domestic price of each book is 40.00 yuan, the annual price is 480.00 yuan. Mailing code 82-454. Honors: Scopus database includes journals in the field of safety science of high-quality scientific journals classification catalog T1 level National Chinese core journals China Science and technology core journals CSCD journals The United States "Chemical Abstracts" search included the United States "Cambridge Scientific Abstracts: Materials Information" search included