Comparison of the conical beam and image source methods for predicting sound fields in a branching tunnel

2007 ◽  
Vol 122 (5) ◽  
pp. 2963
Author(s):  
Sai Tung So ◽  
Kai Ming Li
Keyword(s):  
Image Source ◽  
Sound Fields ◽  
Conical Beam

scholarly journals Coherent Image Source Modeling of Sound Fields in Long Spaces with a Sound-Absorbing Ceiling

2021 ◽  
Vol 11 (15) ◽  
pp. 6743
Author(s):  
Hequn Min ◽  
Ke Xu
Keyword(s):  
Sound Field ◽  
Wave Theory ◽  
Source Model ◽  
Scale Model ◽  
Source Modeling ◽  
Image Source ◽  
Sound Fields ◽  
Absorbing Boundaries ◽  
Proposed Model ◽  
Coherent Image

Sound-absorbing boundaries can attenuate noise propagation in practical long spaces, but fast and accurate sound field modeling in this situation is still difficult. This paper presents a coherent image source model for simple yet accurate prediction of the sound field in long enclosures with a sound absorbing ceiling. In the proposed model, the reflections on the absorbent boundary are separated from those on reflective ones during evaluating reflection coefficients. The model is compared with the classic wave theory, an existing coherent image source model and a scale-model experiment. The results show that the proposed model provides remarkable accuracy advantage over the existing models yet is fast for sound prediction in long spaces.

Predictability of Deterministic Underwater Sound Fields

1993 ◽  
Author(s):  
Michael G. Brown ◽  
Frederick D. Tappert
Keyword(s):  
Underwater Sound ◽  
Sound Fields

Measurements of Acoustic Intensity in Reactive Sound Fields

1973 ◽  
Vol 54 (1) ◽  
pp. 305-306
Author(s):  
T. J. Schultz ◽  
P. W. Smith ◽  
C. I. Malme
Keyword(s):  
Acoustic Intensity ◽  
Sound Fields

scholarly journals Room acoustic prediction and auralization based on an extended image source model

1992 ◽  
Vol 92 (4) ◽  
pp. 2346-2346 ◽  
Author(s):  
Bengt‐Inge Dalenbäck ◽  
Peter Svensson ◽  
Mendel Kleiner
Keyword(s):  
Source Model ◽  
Image Source

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.

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