scholarly journals A relation between normal modes and rays in underwater sound field.

1982 ◽  
Vol 3 (1) ◽  
pp. 27-32
Author(s):  
Shunji Ozaki
Keyword(s):  
Normal Modes ◽  
Sound Field ◽  
Underwater Sound

scholarly journals Spiral Sound Wave Transducer Based on the Longitudinal Vibration

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3674 ◽  
Author(s):  
Wei Lu ◽  
Yu Lan ◽  
Rongzhen Guo ◽  
Qicheng Zhang ◽  
Shichang Li ◽  
...  
Keyword(s):  
Sound Wave ◽  
Longitudinal Vibration ◽  
Three Dimensional ◽  
Low Frequency ◽  
Sound Field ◽  
Field Measurements ◽  
Sound Waves ◽  
Underwater Sound ◽  
Three Dimensional Finite Element ◽  
Wave Transducer

A spiral sound wave transducer comprised of longitudinal vibrating elements has been proposed. This transducer was made from eight uniform radial distributed longitudinal vibrating elements, which could effectively generate low frequency underwater acoustic spiral waves. We discuss the production theory of spiral sound waves, which could be synthesized by two orthogonal acoustic dipoles with a phase difference of 90 degrees. The excitation voltage distribution of the transducer for emitting a spiral sound wave and the measurement method for the transducer is given. Three-dimensional finite element modeling (FEM)of the transducer was established for simulating the vibration modes and the acoustic characteristics of the transducers. Further, we fabricated a spiral sound wave transducer based on our design and simulations. It was found that the resonance frequency of the transducer was 10.8 kHz and that the transmitting voltage resonance was 140.5 dB. The underwater sound field measurements demonstrate that our designed transducer based on the longitudinal elements could successfully generate spiral sound waves.

scholarly journals Parametric spatial post-filtering utilising high-order circular harmonics with applications to underwater sound-field visualisation

2021 ◽  
Vol 149 (6) ◽  
pp. 4463-4476
Author(s):  
Vasileios Bountourakis ◽  
Leo McCormack ◽  
Mathias Winberg ◽  
Ville Pulkki
Keyword(s):  
Sound Field ◽  
High Order ◽  
Underwater Sound

Optimization of the Sound Source Position for Shaping Acoustically-Structurally Coupled Cavities

2001 ◽  
Author(s):  
Arzu Gonenc Sorguc ◽  
Ichiro Hagiwara ◽  
Qinzhong Shi ◽  
Haldun Akagunduz
Keyword(s):  
Sound Source ◽  
Sequential Quadratic Programming ◽  
Normal Modes ◽  
Sound Field ◽  
Source Strength ◽  
Source Position ◽  
Sound Sources ◽  
Coupled Cavities ◽  
Structural Loading ◽  
Initial Starting

Abstract In this study, sound field inside acoustically-structurally coupled rectangular cavity excited by structural loading and sound sources is shaped by optimizing the position of the sound source. In the optimization, Most Probable Optimal Design (MPOD) based on Holographic Neural Network is employed and the results are compared with Sequential Quadratic Programming (SQP). It is shown that source position, rather than source strength, is more effective in acoustically controlled modes. The nodal positions for in-vacuo acoustical normal modes are good candidates for initial starting points.

scholarly journals A Chebyshev-Tau spectral method for normal modes of underwater sound propagation with a layered marine environment

2021 ◽  
Vol 492 ◽  
pp. 115784
Author(s):  
Houwang Tu ◽  
Yongxian Wang ◽  
Qiang Lan ◽  
Wei Liu ◽  
Wenbin Xiao ◽  
...  
Keyword(s):  
Spectral Method ◽  
Marine Environment ◽  
Sound Propagation ◽  
Normal Modes ◽  
Underwater Sound

Range‐dependent normal modes in underwater sound propagation: Application to the wedge‐shaped ocean

1975 ◽  
Vol 58 (6) ◽  
pp. 1171-1177 ◽  
Author(s):  
R. D. Graves ◽  
Anton Nagl ◽  
H. Überall ◽  
G. L. Zarur
Keyword(s):  
Sound Propagation ◽  
Normal Modes ◽  
Underwater Sound

Measurements of the Underwater Sound Field Generated by Quartz Transducers

1951 ◽  
Vol 23 (2) ◽  
pp. 168-172 ◽  
Author(s):  
Winfield Keck ◽  
G. S. Heller ◽  
A. O. Williams
Keyword(s):  
Sound Field ◽  
Underwater Sound
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