Water entry sound detection in strong noise by using the spectrogram matrix decomposition method

Huang, Shichun; Yu, Liang; Jiang, Weikang

doi:10.1016/j.apacoust.2019.107171

Cited by 13 publications

(2 citation statements)

References 24 publications

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“…According to Newton's second law, the entry velocity can be calculated using v � �� 2gH. After the sound pressure was experimentally obtained, the sound power level was calculated according to equation (16), and the power spectrum of the pulsating-bubble sound was used to obtain the range of the bubble resonance frequency. e corresponding range for the bubble radius was then calculated according to equation (17).…”

Section: Experimental Methodmentioning

confidence: 99%

“…Schedin et al studied the transient acoustic near-field of cantilever plates with two different geometric shapes and different materials in the air using optical double-pulse holographic interferometry [15]. Huang Shichu et al studied water-entry sound detection in strong noise by using the spectrogram matrix decomposition method [16]. However, due to the lack of technical methods, the difficulty of measuring and quantifying the acoustic characteristics of objects entering the water, few people pay attention to the quantitative measurement and research of the transient acoustic characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Near-Field Measurements of Water-Entry Sound of Low-Speed Metal Balls in a Non-Anechoic Tank

Yang

Shang

et al. 2021

Mathematical Problems in Engineering

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As one of the target characteristics, water-entry sound characteristics are of great significance to study, and its research has certain reference value for the detection of sea target. The water-entry sound of an underwater target is a transient sound signal, and it is mainly measured in open water such as the sea and lakes. However, due to the short duration of the acoustic signal and the modulation effect of the measuring environment, it is difficult to measure water-entry sound. To deal with this problem, in this work, the water-entry sound of a metal ball was measured in a water tank in a laboratory. The measurements were made in the direct acoustic control area 0.45 m away from the drop point of the ball to eliminate the influence of reflection. Through a time-domain integration, the power of the transient signal of the water-entry sound of the metal ball was obtained. The energy of the initial impact sound and the pulsating-bubble sound was investigated, as was the impact of ball size, entry velocity, and other factors on the characteristics of the water-entry sound. The results show that by combining the virtual-source method with the time-domain integral in the near field, the energy of the incoming sound can be obtained accurately. The results are consistent with closed-space measurements. The water-entry sound includes the initial impact sound and the pulsating-bubble sound. The energy of the pulsating-bubble sound is 3–5 orders of magnitude larger than that of the initial impact sound. The average power level of the water-entry sound is proportional to the ball size and the 2/3 power of the slamming velocity. The relation between the average power level and the 1/3 power of the kinetic energy is an exponential function with base 10. Based on the kinetic energy variety of metal balls entering the water, an acoustic model of this system is established. The results can be used for reference to other transient sound measurements.

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Section: Experimental Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%