Fast localization algorithm for impact of flat plate structure under low SNR

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (10) : 180-187.

PENG Tao1,2,CUI Lilin1,2,HUANG Xiufeng1,2,XU Rongwu1,2,YU Wenjing1,2,CHENG Guo1,2

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Abstract

In order to achieve fast and accurate location of flat plate structure under low signal-to-noise ratio(SNR), this paper firstly combines ensemble empirical mode decomposition and Hilbert transform to extract modal component of curved wave from impact signal. The first peak value of Hilbert envelope is used as the arrival time of bending wave, and the arrival time difference of different sensors is used as the feature to construct the database. Secondly, the initial location area is determined by the energy distribution criterion of sensor signal in the plate structure. Finally, the characteristic residuals are calculated to realize the fast location of impact location. It is verified by plate knock experiment that when SNR=5dB and SNR=0dB, the positioning errors of the proposed algorithm and the positioning algorithm based on GCC and signal threshold are 0.08m, 0.17m, 0.18m and 0.13m, 0.26m, 0.28m respectively, indicating that the proposed algorithm has better anti-noise performance and higher positioning accuracy.

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PENG Tao1,2,CUI Lilin1,2,HUANG Xiufeng1,2,XU Rongwu1,2,YU Wenjing1,2,CHENG Guo1,2 . Fast localization algorithm for impact of flat plate structure under low SNR[J]. Journal of Vibration and Shock, 2023, 42(10): 180-187

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