AZIMUTHAL LIMITATION IN THE PARABOLIC-EQUATION APPROXIMATION FOR THREE-DIMENSIONAL UNDERWATER ACOUSTIC PROPAGATION

2004 ◽  
Author(s):  
LI-WEN HSIEH ◽  
YING-TSONG LIN ◽  
CHI-FANG CHEN
Keyword(s):  
Parabolic Equation ◽  
Three Dimensional ◽  
Acoustic Propagation ◽  
Underwater Acoustic

Underwater acoustic energy fluctuations during strong internal wave activity using a three-dimensional parabolic equation model

2019 ◽  
Vol 146 (3) ◽  
pp. 1875-1887 ◽  
Author(s):  
Georges A. Dossot ◽  
Kevin B. Smith ◽  
Mohsen Badiey ◽  
James H. Miller ◽  
Gopu R. Potty
Keyword(s):  
Parabolic Equation ◽  
Internal Wave ◽  
Three Dimensional ◽  
Equation Model ◽  
Wave Activity ◽  
Acoustic Energy ◽  
Underwater Acoustic

scholarly journals High-Frequency Underwater Acoustic Propagation in a Port Modeled as a Three-Dimensional Duct Closed at One End Using the Method of Images

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Pierre-Philippe J. Beaujean ◽  
Matthew D. Staska
Keyword(s):  
Impulse Response ◽  
Sea Water ◽  
Three Dimensional ◽  
Acoustic Propagation ◽  
Method Of Images ◽  
Concrete Walls ◽  
Underwater Acoustic ◽  
Sensor Position ◽  
Duct Geometry ◽  
Channel Bottom

A computer-efficient model for underwater acoustic propagation in a shallow, three-dimensional rectangular duct closed at one end has been developed using the method of images. The duct simulates a turning basin located in a port, surrounded with concrete walls, and filled with sea water. The channel bottom is composed of silt. The modeled impulse response is compared with the impulse response measured between 15 kHz and 33 kHz. Despite small sensor-position inaccuracies and an approximated duct geometry, the impulse response can be modeled with a relative echo magnitude error of 1.62 dB at worst and a relative echo location error varying between 0% and 4% when averaged across multiple measurements and sensor locations. This is a sufficient level of accuracy for the simulation of an acoustic communication system operating in the same frequency band and in shallow waters, as time fluctuations in echo magnitude commonly reach 10 dB in this type of environment.

scholarly journals A Chebyshev Spectral Method for Normal Mode and Parabolic Equation Models in Underwater Acoustics

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Houwang Tu ◽  
Yongxian Wang ◽  
Wei Liu ◽  
Xian Ma ◽  
Wenbin Xiao ◽  
...  
Keyword(s):  
Parabolic Equation ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Spectral Method ◽  
Normal Mode ◽  
Ideal Fluid ◽  
Difference Method ◽  
Acoustic Propagation ◽  
Underwater Acoustic ◽  
Chebyshev Spectral Method

In this paper, the Chebyshev spectral method is used to solve the normal mode and parabolic equation models of underwater acoustic propagation, and the results of the Chebyshev spectral method and the traditional finite difference method are compared for an ideal fluid waveguide with a constant sound velocity and an ideal fluid waveguide with a deep-sea Munk speed profile. The research shows that, compared with the finite difference method, the Chebyshev spectral method has the advantages of a high computational accuracy and short computational time in underwater acoustic propagation.

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