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ANALYSIS ON THE TIME-FREQUENCY CHARACTERISTICS OF ULTRASONIC WAVEFORM OF COAL UNDER UNIAXIAL LOADING

State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, P. R. China

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China

E-mail Address: zhangzhibo@ustb.edu.cn

Corresponding author.

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ENYUAN WANG

Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China

School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China

State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China

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YINGHUA ZHANG

State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, P. R. China

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China

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SHUAI YANG

Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China

School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China

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XIANAN LIU

State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing, Beijing 100083, P. R. China

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China

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MUHAMMAD ALI

Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China

School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China

Department of Mining Engineering, Balochistan University of Information Technology, Engineering and Management Sciences, Quetta, Balochistan 87300, Pakistan

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, and

GUANSHENG QI

College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, P. R. China

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https://doi.org/10.1142/S0218348X19501007Cited by:22 (Source: Crossref)

Abstract

Ultrasonic receiving wave can reflect physical properties and damage degree of coal samples. Therefore, it is of great significance to deeply study the parameters of ultrasonic. In this paper, time-domain characteristics of receiving wave are analyzed systematically, which present good correlation with stress. The frequency spectrum of receiving wave is obtained using Fast Fourier Transform (FFT), and peak frequency and centroid frequency are calculated. During the entire loading process, peak frequency fluctuates around 110kHz, but corresponding centroid frequency decreases obviously at the end stage of loading. According to multifractal theory, the multifractal spectrum of wavelet packet energy characteristics is calculated. The results show that wavelet packet energy distribution has obvious multifractal characteristics, and multifractal parameter $Δ α$ presents downward trend before coal samples buckling failure. Based on damage process of the coal samples, the reason of change in $Δ α$ value is related to damage degree of coal samples. This research is of great significance for understanding the deformation and failure process of coal samples using ultrasonic technology.

Keywords:

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