Numerical study on radiation impedance of underwater sound sources in non-anechoic tank

2018 ◽  
Vol 143 (3) ◽  
pp. 1976-1976
Author(s):  
Yiming Zhang ◽  
Rui Tang ◽  
Qi Li ◽  
Xin Feng
Keyword(s):  
Numerical Study ◽  
Underwater Sound ◽  
Sound Sources ◽  
Radiation Impedance

Numerical Study on Air-Reed Instruments With LES

2011 ◽  
Author(s):  
Kin’ya Takahashi ◽  
Masataka Miyamoto ◽  
Yasunori Ito ◽  
Toshiya Takami ◽  
Taizo Kobayashi ◽  
...  
Keyword(s):  
Numerical Study ◽  
Sound Field ◽  
Acoustic Analogy ◽  
Empirical Theory ◽  
Sound Sources ◽  
Aerodynamic Sound ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Semi Empirical ◽  
2D And 3D

The acoustic mechanisms of 2D and 3D edge tones and a 2D small air-reed instrument have been studied numerically with compressible Large Eddy Simulation (LES). Sound frequencies of the 2D and 3D edge tones obtained numerically change with the jet velocity well following Brown’s semi-empirical equation, while that of the 2D air-reed instrument behaves in a different manner and obeys the semi-empirical theory, so called Cremer-Ising-Coltman theory. We have also calculated aerodynamic sound sources for the 2D edge tone and the 2D air-reed instrument relying on Ligthhill’s acoustic analogy and have discussed similarities and differences between them. The sound source of the air-reed instrument is more localized around the open mouth compared with that of the edge tone due to the effect of the strong sound field excited in the resonator.

Piezoelectric composites of the 1–3 type used as underwater sound sources

1993 ◽  
Vol 93 (4) ◽  
pp. 2305-2305 ◽  
Author(s):  
Wayne T. Reader ◽  
David F. Sauter
Keyword(s):  
Underwater Sound ◽  
Sound Sources ◽  
Piezoelectric Composites

An Investigation Into Acoustics and Vibraton of CPAP Devices: Numerical Prediction of Centrifugal Fan Acoustics and Vibration

2013 ◽  
Author(s):  
Xuan-Tung Vuong ◽  
A. M. Al-Jumaily ◽  
Robert Paxton
Keyword(s):  
Numerical Study ◽  
Centrifugal Fan ◽  
Acoustic Analogy ◽  
Flow Induced Vibration ◽  
Upper Airways ◽  
Sound Sources ◽  
Human Interface ◽  
Obstructive Sleep ◽  
Unsteady Simulation ◽  
Cpap Devices

Continuous Positive Air Pressure (CPAP) devices are used to generate pressurized airflow to relieve upper airways and allow Obstructive Sleep Apnea (OSA) patients to breathe comfortably and easily. The airflow path in these devices consists of several components including but is not limited to inlet and outlet ducts, a centrifugal fan, a humidifier and a human interface. These components contribute significantly to the noise generated by the airflow. This research paper present a numerical study of a centrifugal fan performed with commercial ANSYS software package to predict the sound and vibration produced by the centrifugal fan. The methodologies are following: first, the unsteady flow field is computed using the CFD model to obtain aerodynamic quantities and sound sources. Then, the finite element method (FEM) is used to predict the flow-induced vibration using the predicted aerodynamic quantities. Finally, the Ffowcs-William and Hawkings’s (FW-H) acoustic analogy is used to predict the acoustic pressure at the far-field using the sound sources from the unsteady simulation.

Magnetoacoustics and Thermoacoustics—New Ideas in Underwater Sound Sources

1963 ◽  
Vol 2 (2) ◽  
pp. 33-38
Author(s):  
Emil J. Hellund ◽  
John T. Naff ◽  
Robert C. Brumfield
Keyword(s):  
Underwater Sound ◽  
Sound Sources ◽  
New Ideas

Bender bar transducers for low‐frequency underwater sound sources

1979 ◽  
Vol 65 (S1) ◽  
pp. S127-S127
Author(s):  
C. A. Sheridan ◽  
O. L. Akervold
Keyword(s):  
Low Frequency ◽  
Underwater Sound ◽  
Sound Sources

Underwater Sound in an Urban Estuarine River: Sound Sources, Soundscape Contribution, and Temporal Variability

2016 ◽  
Vol 44 (1) ◽  
pp. 171-186 ◽  
Author(s):  
Sarah A. Marley ◽  
Christine Erbe ◽  
Chandra P. Salgado-Kent
Keyword(s):  
Temporal Variability ◽  
Underwater Sound ◽  
Sound Sources
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