Research on the Characteristics of Electromagnetic Radiation in the Impact Damage Process of Coal

Abstract:

The damage process of coal is often accompanied by electromagnetic radiation. Researches on the characteristics of electromagnetic radiation in the impact damage of coal are significance. Due to the presence of background noise of environment and instrument. The acquisition signals contain noise. So noise reduction is also important. Using split Hopkinson pressure bar (SHPB) and transient ZDKT-1 type magnetic vibration test system, we acquisition electromagnetic radiation signal in the process of impact damage of coal. By using Hilbert huang transform (HHT),we reduced the noise in the original signal. Then we analysed the characteristics of electromagnetic radiation signal after noise reduction. It is demonstrated that: (1) It can get good noise reduction effect for electromagnetic radiation signal by HHT method.(2) The characteristics of signals show that straight line rises in the beginning, index decreases in the middle, and small oscillation occurs in the end.(3) The duration of electromagnetic radiation signal are less than 2 s , and the frequency are 0 ~ 40 Hz. (4) The amplitude of signals increase with impact velocities.

• Periodical: Advanced Materials Research (Volumes 1006-1007)
• Pages: 121-127
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1006-1007.121
• Online since: August 2014
• Authors: Jin Gui Wang*, Su Zhang, Li Hao Ai, Ying Feng Sun
• Keywords: CoAl, Hilbert Huang Transform, Noise Reduction, Split Hopkinson Pressure Bar

References

[1] M. V. Kurlenya, A. G. Vostretsov, M. M. Pynzar, etc.: Journal of mining science, 2002, 38: 20-24.

DOI: 10.1023/a:1020232516636

[2] V. Hadjicontis, C. Mavromatou, and D. Ninos.: Natural Hazards and Earth System Sciences, 2004, 4: 633–639.

DOI: 10.5194/nhess-4-633-2004

[3] K. Fukui, S. Okubo, and T. Terashima: Rock Mech. Rock Engng, 2005, 38 (5): 411–423.

DOI: 10.1007/s00603-005-0046-7

[4] Cheng-wu LI, Bei-jing XIE, Wei YANG, et. al. Coal Impact damage SHPB testing signal de-noising based on HHT method[J]. Journal of China Coal Society, 2012, 37(11): 1796-1892. . (in Chinese).

[5] Bei-jingXie. Experimental research on characteristics of coal impact damage dynamics and magnetic field[D]. Beijing: School of Resource and Safety Engineering, China University of Mining and Technology(Beijing), 2013. (in Chinese).

[6] Yan Fu, Rong-chun Zhao, Gang Wang. Seismic data de-noising based on wavelet transform [J]. Journal of Northwestern Polytechnical University, 2004, 22（6）: 774-777. (in Chinese).

[7] Xi-bing Li, Tong-hua Ling, Yi-ping Zhang. Analysis of blast vibration signals theories and methods[M]. Beijing: Science Press, 2009: 82-84. (in Chinese).

[8] ManXue. A Study of Ensemble Empirical Mode Decomposition [D]. Harbin: Harbin Engineering University, 2007，28-30. (in Chinese).

[9] Z H WU, N E Huang. Ensemble empirical mode decomposition: a noise-assisted data analysis method[J]. World Scientific, 2009, 1(1): 1-41.