The Sea Surface as a Random Filter for Underwater Sound Waves

1973 ◽  
Vol 54 (1) ◽  
pp. 290-290
Author(s):  
L. Fortuin
Keyword(s):  
Sea Surface ◽  
Sound Waves ◽  
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 Backscattering of Underwater Sound from the Sea Surface

1958 ◽  
Vol 30 (7) ◽  
pp. 684-684
Author(s):  
G. R. Garrison ◽  
S. R. Murphy ◽  
D. S. Potter
Keyword(s):  
Sea Surface ◽  
Underwater Sound

Near‐Grazing Specular Scatter of Underwater Sound from a Wind‐Driven Model Sea Surface

1968 ◽  
Vol 44 (1) ◽  
pp. 355-356 ◽  
Author(s):  
Jack W. Scheible ◽  
Richard C. Fowler ◽  
Herman Medwin
Keyword(s):  
Sea Surface ◽  
Underwater Sound

Modeling and Characterization of Bio-Inspired Hydro-Acoustic Sensor

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Jin-Hyuk Lee ◽  
Per G. Reinhall ◽  
Hwan-Sik Yoon
Keyword(s):  
Sound Propagation ◽  
Fe Model ◽  
Acoustic Sensor ◽  
Sound Waves ◽  
Underwater Sound ◽  
Sensor Model ◽  
Commercial Software Package ◽  
Hydrophone Array ◽  
Study Performance

A biomimetic miniature underwater acoustic sensor is proposed and analyzed for the measurement of directivity of underwater sound propagation. Unlike a hydrophone array, which detects propagation direction by the arrival time of sound waves, this novel sensor is based on a mechanically coupled mechanism, which amplifies the time delay of the arriving sound wave. In this paper, a mathematical model of the sensor is developed based on the finite element (FE) modeling technique, and it is used to study performance characteristics of the sensor. Effects of the fluid–structure interaction are examined through simulation of the sensor model and the results are compared with those obtained by a full scale FE model developed in a commercial software package.

scholarly journals Backscattering of Underwater Sound from a Wind‐Driven Model Sea Surface

1967 ◽  
Vol 42 (5) ◽  
pp. 1184-1184
Author(s):  
Herman Medwin ◽  
Ernest C. Ball ◽  
John A. Carlson
Keyword(s):  
Sea Surface ◽  
Underwater Sound

Measurements of the Backscattering of Underwater Sound from the Sea Surface

1960 ◽  
Vol 32 (1) ◽  
pp. 104-111 ◽  
Author(s):  
G. R. Garrison ◽  
S. R. Murphy ◽  
D. S. Potter
Keyword(s):  
Sea Surface ◽  
Underwater Sound

scholarly journals A Composite Perforated Partitioned Sandwich Panel With Corrugation for Underwater Low-Frequency Sound Absorption

2021 ◽  
Vol 7 ◽  
Author(s):  
Junyi Wang ◽  
Jiaming Hu ◽  
Yun Chen
Keyword(s):  
Acoustic Wave ◽  
Composite Structure ◽  
Sound Absorption ◽  
Low Frequency ◽  
Propagation Loss ◽  
Sound Waves ◽  
Acoustic Metamaterials ◽  
Underwater Sound ◽  
Underwater Acoustic ◽  
Frequency Sound

Underwater acoustic wave absorption and control play an important role in underwater applications. Various types of underwater acoustic metamaterials have been proposed in recent years with the vigorous development of acoustic metamaterials. Compared with airborne sound, underwater sound waves have a longer wavelength and much smaller propagation loss, making them more difficult to control. In addition, given that the acoustic impedance of water is much greater than that of air, numerous conventional materials and structures are not suited to underwater use. In this paper, we propose a composite structure based on an excellent broadband low-frequency sound absorber of air using aluminum mixed with rubber. Our composite structure possesses broadband low-frequency (<1,000 Hz) sound absorption underwater, omnidirectional high sound absorption coefficient under the oblique incidence (0–75°), and pressure resistance. It has promising applications for underwater acoustic wave control and contributes to the design of underwater acoustic metamaterials.

Scattering of Underwater Sound by the Sea Surface

1961 ◽  
Vol 33 (3) ◽  
pp. 334-340 ◽  
Author(s):  
H. Wysor Marsh ◽  
M. Schulkin ◽  
S. G. Kneale
Keyword(s):  
Sea Surface ◽  
Underwater Sound
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