Research on Characteristics of Abnormal Underwater Acoustic Wave Transmission through Water-Air Interface

doi:10.12382/bgxb.2021.0891

Abstract

Abstract:

To explore the abnormal transmission characteristics of underwater acoustic wave through the water-air interface, theoretical and experimental studies on abnormal acoustic transmission under the effect of inhomogeneous waves are carried out. An underwater acoustic wave transmission experiment system is constructed in both the laboratory and the open water environment of Qiandao Lake.The law of the transmission coefficient with the depth of the sound source and the frequency of the sound wave are obtained.The mechanism and influencing factors of the inhomogeneous waves are thoroughlyanalyzed.The results demonstrate that when the product of source depth and underwater sound wave number is less than 1, the effect of inhomogeneous waves cannot be ignored, and the transmission coefficient increases abnormally.When the energy ratio of the homogeneous waves and inhomogeneous waves is close, the transmission coefficient decreases undulatingly with the increase of the wave frequency, and decreases smoothly with the increase of the source depth.The range of radiation angles of underwater acoustic waves transmitted into the air is greatly affected by the inhomogeneous waves.With a stronger inhomogeneous wave effect, the radiation angle range gradually expands. The research results lay afoundation for applyingabnormal transmission of underwater acoustic waves in the real world,and provide data support for the transmission of acoustic signals across media.

Key words: underwater sound wave, abnormal sound transmission, source depth

QIANG Wei, LI Ning, HUANG Xiaolong, KANG Yang, LI Can, WENG Chunsheng. Research on Characteristics of Abnormal Underwater Acoustic Wave Transmission through Water-Air Interface[J]. Acta Armamentarii, 2023, 44(4): 1148-1157.

Figures/Tables 10

Fig.1 Schematic diagram of acoustic wave propagation at the water-air interface

Fig.2 Variation of p S H 1 M, p S H 2 M and Ap with kz

Fig.3 Schematic diagram of equipment and layout of acoustic wave transmission experiment system

Fig.4 Pressure-time characteristics of signals at different frequencies

Fig.5 Time-frequency analysis of sound pressure signals

Fig.6 Ratio of inhomogeneous wave energy to total energy

Fig.7 Layout of the lake experiment system

Fig.8 Effects of source depth on sound wave transmission coefficient Ap at different frequencies (z=0.3-9m)

Fig.9 Effects of sound wave frequency on the transmission coefficient Ap at different source depths

Fig.10 Variation law of transmission coefficients from different angles with typical source depths

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