Background: The load characteristics of pick cutting coal seam
with coal-rock interface was studied by Time-frequency method in this paper.
The commonly signal processing schemes were compared, and the suitable test
load EMD (Empirical Mode Decomposition) empirical mode decomposition scheme
for signal decomposition and denoising was selected.
Objective: The cutting load power spectra were obtained and the cutting
load 3D (three dimensional) combined amplitude, time frequency, spectrum and
marginal spectrum were obtained by Hilbert Huang transform.
Method: The analysis by 3D combined amplitude, time frequency, spectrum and
marginal spectrum show that it becomes one of the main cutting bands of coal
rock interface in 15Hz frequency band, this corresponds to the theoretical
analysis of the load fluctuations in drum bands. Becausethe parameters
related to the single cutting rotation frequency are affected by the
interface change. The more obvious frequency components are near 45Hz and
75Hz is due to the frequency doubling of the frequency variation with the
interface load, which should be related to the frequency of the included
angle with the pick speed.
Results: It can be seen from the power spectrum analysis of roller cutting
test shows that the main frequency distribution is generated by the
crossover motion parameters and the caving effect of the picking and the
role of coal and rock, and the material parameters of the cutting object are
Conclusion: The coal load amplitude transition will appear with coal seams
cut into the rock formation in the coal seam, which is consistent with the
previous theoretical analysis and load characteristics analysis. The
blasting of coal and rock has a great relationship with the homogeneity of
coal and rock material itself, the material with the uniformity index is
more stable, while the material load with smaller uniformity index
Keywords: Coal-rock interface, coal seam, EMD denoising, load spectrum
analysis, marginal spectrum, wavelet denoising
Rights & PermissionsPrintExport