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Citation:
　Parviz Ghadimi,Alireza Bolghasi,Mohammad A. Feizi Chekab,et al.Numerical Investigation of Transmission of Low Frequency Sound Through a Smooth Air-water Interface[J].Journal of Marine Science and Application,2015,(3):334-342.[doi:10.1007/s11804-015-1315-9]
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Numerical Investigation of Transmission of Low Frequency Sound Through a Smooth Air-water Interface

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Title:
Numerical Investigation of Transmission of Low Frequency Sound Through a Smooth Air-water Interface
Author(s):
Parviz Ghadimi1;  Alireza Bolghasi1;  Mohammad A. Feizi Chekab1;  Rahim Zamanian2
Affilations:
Author(s):
Parviz Ghadimi1;  Alireza Bolghasi1;  Mohammad A. Feizi Chekab1;  Rahim Zamanian2
1. Department of Marine Technology, Amirkabir University of Technology, Tehran 15875-4413, Iran;
2. International Campus-Mechanical Engineering Group, Amirkabir University of Technology, Tehran 15875-4413, Iran
Keywords:
enhanced sound transmission; anomalous transparency; air-water interface; shallow depth source; sound transmission; Helmholtz wave equations
分类号:
-
DOI:
10.1007/s11804-015-1315-9
Abstract:
It is the traditional belief that sound transmission from water to the air is very weak due to a large contrast between air and water impedances. Recently, the enhanced sound transmission and anomalous transparency of air-water interface have been introduced. Anomalous transparency of air-water interface states that the sound generated by a submerged shallow depth monopole point source localized at depths less than 1/10 sound wavelength, can be transmitted into the air with omni-directional pattern. The generated sound has 35 times higher power compared to the classical ray theory prediction. In this paper, sound transmission through air-water interface for a localized underwater shallow depth source is examined. To accomplish this, two-phase coupled Helmholtz wave equations in two-phase media of air-water are solved by the commercial finite element based COMSOL Multiphysics software. Ratios of pressure amplitudes of different sound sources in two different underwater and air coordinates are computed and analyzed against non-dimensional ratio of the source depth (D) to the sound wavelength (λ). The obtained results are compared with the experimental data and good agreement is displayed.

References:

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Memo

Memo:
收稿日期:2014-12-1;改回日期:2014-12-29。
通讯作者:Parviz Ghadimi, E-mail:pghadimi@aut.ac.ir
Last Update: 2015-09-01