An improved method to eliminate modal aliasing and false component in blast vibration signals

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (17) : 197-204.

LI Qing1, XU Wenlong1, ZHANG Di2, LI Na1, FENG Dandan1

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Abstract

Aiming at limitations of the complementary ensemble empirical mode decomposition (CEEMD) method in dealing with problems of modal aliasing and false components of blast vibration signals, an improved solution correlation CEEMD method was proposed.Firstly, after specially processing a signal’s end point, CEEMD was used to decompose the signal.Secondly, correlation coefficient between each IMF component and the original signal and its frequency spectrum were solved to judge false component.Thirdly, after false components and principal components were added, the solution correlation calculation was done to eliminate modal aliasing.The decomposing results of simulated signals with CEEMD as well as correlation coefficients and energy interpolation calculation showed that the decomposition accuracy of the improved solution correlation CEEMD method is higher than those of EMD and CEEMD to effectively suppress signals’ mode aliasing phenomenon, and avoid energy loss brought by directly processing false components; after this method was applied to decompose a blast vibration signal, the energy proportion of non-main frequency parts in each IMF component is basically kept to be lower; so, the improved method can effectively eliminate modal aliasing and false component phenomenon in blast vibration signals.

Key words

Blasting vibration signal / CEEMD / Decorrelation / Modal aliasing / False component

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LI Qing1, XU Wenlong1, ZHANG Di2, LI Na1, FENG Dandan1. An improved method to eliminate modal aliasing and false component in blast vibration signals[J]. Journal of Vibration and Shock, 2019, 38(17): 197-204

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