scholarly journals A Coupling Graphic Pipeline with Normal Mode Model for Rapid Calculation of Underwater Acoustic Field

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Jianghao Zhuo ◽  
Ling Wang ◽  
Ke Xu ◽  
Jianwei Wan
Keyword(s):  
High Resolution ◽  
Shallow Water ◽  
Normal Mode ◽  
Acoustic Field ◽  
Sound Field ◽  
Underwater Acoustic ◽  
Matlab Code ◽  
Acoustic Modelling ◽  
Rapid Calculation ◽  
Execution Speed

Rapid execution is required in operation-oriented applications in underwater acoustic modelling. In this paper, the GPU graphic pipeline is used to accelerate the calculation of high-resolution sound field image in the normal mode model of underwater acoustic propagation. The computer times of the proposed graphic pipeline method, the MATLAB code, and the C# code are compared for a stratified shallow water waveguide using the KRAKEN model at different frequencies. The research validates that the graphic pipeline method outperforms the classic CPU-based methods in terms of execution speed at the frequencies where the eigenvalue equation in normal mode models can be solved.

A Combined Finite Element Method with Normal Mode for the Elastic Structural Acoustic Radiation in Shallow Water

2020 ◽  
Vol 28 (04) ◽  
pp. 2050004
Author(s):  
Buchao An ◽  
Chao Zhang ◽  
Dejiang Shang ◽  
Yan Xiao ◽  
Imran Ullah Khan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Shallow Water ◽  
Normal Mode ◽  
Acoustic Field ◽  
Acoustic Radiation ◽  
Three Dimensional ◽  
Far Field ◽  
Azimuthal Direction ◽  
Element Method

A combined Finite Element Method with Normal Mode (FEM-NM) is proposed for calculation of the acoustic field radiated by a three-dimensional structural source in shallow water. The FEM is used to calculate the near range acoustic field, then the modes expansion at the vertical and azimuthal direction is performed at a certain coupling range. Hence, the true three-dimensional acoustic field at any range is obtained rapidly by the NM theory. The numerical examples show the efficiency and accuracy of this method. The coupling range and the truncation of the vertical modes hardly affect the far field results.

APPLICATION OF THE HIGH-RESOLUTION RANS/ILES TECHNOLOGY FOR FLOW SIMULATION AND THE NEARBY ACOUSTIC FIELD OF NEAR-WALL JETS AND MIXING LAYERS

2016 ◽  
Vol 47 (2) ◽  
pp. 159-183 ◽  
Author(s):  
Leonid Aleksandrovich Bendersky ◽  
Dmitriy Aleksandrovich Lyubimov ◽  
Irina Vasilevna Potekhina ◽  
Alena Eduardovna Fedorenko
Keyword(s):  
High Resolution ◽  
Acoustic Field ◽  
Flow Simulation ◽  
Mixing Layers ◽  
Wall Jets ◽  
Near Wall

scholarly journals A Green’s Function for Acoustic Problems in Pekeris Waveguide Using a Rigorous Image Source Method

2021 ◽  
Vol 11 (6) ◽  
pp. 2722
Author(s):  
Zhiwen Qian ◽  
Dejiang Shang ◽  
Yuan Hu ◽  
Xinyang Xu ◽  
Haihan Zhao ◽  
...  
Keyword(s):  
Green’S Function ◽  
Shallow Water ◽  
Green's Function ◽  
Plane Waves ◽  
Spherical Wave ◽  
Sound Field ◽  
Efficient Computation ◽  
Image Source ◽  
Source Method ◽  
Pekeris Waveguide

The Green’s function (GF) directly eases the efficient computation for acoustic radiation problems in shallow water with the use of the Helmholtz integral equation. The difficulty in solving the GF in shallow water lies in the need to consider the boundary effects. In this paper, a rigorous theoretical model of interactions between the spherical wave and the liquid boundary is established by Fourier transform. The accurate and adaptive GF for the acoustic problems in the Pekeris waveguide with lossy seabed is derived, which is based on the image source method (ISM) and wave acoustics. First, the spherical wave is decomposed into plane waves in different incident angles. Second, each plane wave is multiplied by the corresponding reflection coefficient to obtain the reflected sound field, and the field is superposed to obtain the reflected sound field of the spherical wave. Then, the sound field of all image sources and the physical source are summed to obtain the GF in the Pekeris waveguide. The results computed by this method are compared with the standard wavenumber integration method, which verifies the accuracy of the GF for the near- and far-field acoustic problems. The influence of seabed attenuation on modal interference patterns is analyzed.

An efficient and robust method for underwater acoustic normal‐mode computations

1995 ◽  
Vol 97 (3) ◽  
pp. 1576-1585 ◽  
Author(s):  
Scott J. Levinson ◽  
Evan K. Westwood ◽  
Robert A. Koch ◽  
Stephen K. Mitchell ◽  
Carol V. Sheppard
Keyword(s):  
Normal Mode ◽  
Robust Method ◽  
Underwater Acoustic

High resolution spectroscopic study of H2 Se (40+,0) A1 and (40-,0) B2 stretching states: normal mode and local mode analysis

1997 ◽  
Vol 92 (6) ◽  
pp. 1073-1082 ◽  
Author(s):  
By ZE-YI ZHOU ◽  
XIAO-GANG WANG ◽  
ZHONG-PING ZHOU ◽  
OLEG N. ULENIKOV ◽  
GALINA A. ONOPENKO ◽  
...  
Keyword(s):  
High Resolution ◽  
Spectroscopic Study ◽  
Normal Mode ◽  
Mode Analysis ◽  
Local Mode ◽  
Local Mode Analysis

scholarly journals Shallow water seagrass observed by high resolution full waveform bathymetric LiDAR

2014 ◽  
Author(s):  
Zhigang Pan ◽  
Juan Carlos Fernandez-Diaz ◽  
Craig L. Glennie ◽  
Michael Starek
Keyword(s):  
High Resolution ◽  
Shallow Water ◽  
Full Waveform
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