The time-frequency analysis of the acoustic signal produced in underwater discharges based on Variational Mode Decomposition and Hilbert–Huang Transform

The experiments of underwater discharges in an anechoic pool were carried out and analysis of the time-frequency characteristics of the acoustic signals was conducted based on Variational Mode Decomposition and Hilbert–Huang Transform (VMD-HHT). We propose a relative center frequency difference meth...

Full description

Saved in:
Bibliographic Details
Published in:Scientific reports 2023-01, Vol.13 (1), p.22-22, Article 22
Main Authors: Han, Zhen, Zhang, Xiaobing, Yan, Bing, Qiao, Liang, Wang, Zhigang
Format: Article
Language:English
Subjects:
639/166
639/166/987
639/766
639/766/1960
639/766/25/3927
Acoustics
Decomposition
Energy
Frequency analysis
Frequency dependence
Humanities and Social Sciences
multidisciplinary
Science
Science (multidisciplinary)
Shock waves
Sonar
Underwater
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The experiments of underwater discharges in an anechoic pool were carried out and analysis of the time-frequency characteristics of the acoustic signals was conducted based on Variational Mode Decomposition and Hilbert–Huang Transform (VMD-HHT). We propose a relative center frequency difference method to determine the decomposition numbers K which has to be given before the application of VMD and the result is satisfying. The HHT spectrum and marginal spectrum are obtained, then, some valuable conclusions are drawn. The high-frequency components of the acoustic signal are mainly attributed to the shock wave, and the low-frequency components mostly result from the bubble pulse. The frequency range of the acoustic signal is basically from 0 to 90kHz, and the ratio of energy in the low-frequency band(0–4kHz) to that of the total acoustic signal is up to 55.56%. Furthermore, this ratio versus gaps is also explored and it has the minimum at the gap of 1.5 mm which is the optimal gap for the peak pressure and radiated energy of the acoustic signal. Therefore, we can not obtain the maximum energy of the acoustic signal and the maximum ratio in the low-frequency band simultaneously.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-27359-5