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

被引：0
|
作者：
Peng T. [1 ,2 ]
Cui L. [1 ,2 ]
Huang X. [1 ,2 ]
Xu R. [1 ,2 ]
Yu W. [1 ,2 ]
Cheng G. [1 ,2 ]
机构：
[1] National Key Laboratory on Ship Vibration and Noise, Naval University of Engineering, Wuhan
[2] Institute of Noise and Vibration, Naval University of Engineering, Wuhan
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2023年 / 42卷 / 10期
关键词：
ensemble empirical mode decomposition (EEMD); feature database; Hilbert envelope; time delay estimation;
D O I：
10.13465/j.cnki.jvs.2023.10.022
中图分类号：
学科分类号：
摘要：
In order to realize fast and accurate location of flat plate structure after impact under low signal-to-noise ratio ( SNR)，this paper firstly combines ensemble empirical mode decomposition ( EEMD) and Hilbert transform to extract modal component of curved wave from impact signal. The first peak value of Hilbert envelope was used as the arrival time of bending wave，and the arrival time difference of different sensors was used as the feature to construct the database. Secondly, the initial location area was determined by the energy distribution criterion of sensor signal in the plate structure. Finally, the characteristic residuals were calculated to realize the fast location of impact position. It is verified by plate knock experiment that when SNR = 5 dB and SNR = 0，the positioning errors of the proposed algorithm and the algorithm based on generalized cross correlation ( GCC) and signal threshold are 0. 08 m, 0. 17 m，0. 18 m and 0. 13 m, 0. 26 m，0. 28 m respectively, indicating that the proposed algorithm has better anti-noise performance and higher positioning accuracy. © 2023 Chinese Vibration Engineering Society. All rights reserved.
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页码：180 / 187
页数：7
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