Analysis of sound propagation over terrain discontinuities in the presence of wind by two‐dimensional ray tracing

1990 ◽  
Vol 88 (4) ◽  
pp. 2033-2033
Author(s):  
Pablo A. Daroux
Keyword(s):  
Ray Tracing ◽  
Sound Propagation ◽  
Two Dimensional

Methods to Accelerate Ray Tracing in the Monte Carlo Method for Surface-to-Surface Radiation Transport

2006 ◽  
Vol 128 (9) ◽  
pp. 945-952 ◽  
Author(s):  
Sandip Mazumder
Keyword(s):  
Monte Carlo ◽  
Ray Tracing ◽  
Radiation Transport ◽  
Three Dimensional ◽  
Intersection Point ◽  
Surface Radiation ◽  
Computational Domain ◽  
Two Dimensional ◽  
Spatial Partitioning ◽  
The Monte Carlo Method

Two different algorithms to accelerate ray tracing in surface-to-surface radiation Monte Carlo calculations are investigated. The first algorithm is the well-known binary spatial partitioning (BSP) algorithm, which recursively bisects the computational domain into a set of hierarchically linked boxes that are then made use of to narrow down the number of ray-surface intersection calculations. The second algorithm is the volume-by-volume advancement (VVA) algorithm. This algorithm is new and employs the volumetric mesh to advance the ray through the computational domain until a legitimate intersection point is found. The algorithms are tested for two classical problems, namely an open box, and a box in a box, in both two-dimensional (2D) and three-dimensional (3D) geometries with various mesh sizes. Both algorithms are found to result in orders of magnitude gains in computational efficiency over direct calculations that do not employ any acceleration strategy. For three-dimensional geometries, the VVA algorithm is found to be clearly superior to BSP, particularly for cases with obstructions within the computational domain. For two-dimensional geometries, the VVA algorithm is found to be superior to the BSP algorithm only when obstructions are present and are densely packed.

Flow-dependent modeling of acoustic propagation based on DG-FEM method

2021 ◽  
Author(s):  
Zichen Wang ◽  
Jian Xu ◽  
Xuefeng Zhang ◽  
Can Lu ◽  
Kangkang Jin ◽  
...  
Keyword(s):  
Sound Propagation ◽  
Transmission Loss ◽  
Acoustic Propagation ◽  
Water Area ◽  
Current Speed ◽  
Propagation Model ◽  
Propagation Loss ◽  
Two Dimensional ◽  
Underwater Sound ◽  
Ocean Environment

AbstractThis paper proposes a two-dimensional underwater sound propagation model using the Discontinuous Galerkin Finite Element Method (DG-FEM) to investigate the influence of current on sound propagation. The acoustic field is calculated by the convected wave equation with the current speed parameter. Based on the current speed data from an assimilation model, a two-dimensional coupled acoustic propagation model in the Fram Strait water area is established to observe the variability in propagation loss under different seasonal velocities in the real ocean environment. The transmission loss and signal time structure are examined. The results obtained in different source frequencies are also compared. It appears that the current velocity, time and range variation all have an effect on underwater sound propagation.

Determination of equivalent sound speed profiles for ray tracing in near-ground sound propagation

2007 ◽  
Vol 122 (3) ◽  
pp. 1391-1403 ◽  
Author(s):  
John M. Prospathopoulos ◽  
Spyros G. Voutsinas
Keyword(s):  
Ray Tracing ◽  
Sound Speed ◽  
Sound Propagation

Prediction of sound propagation in rectangular ducts by a ray‐tracing model with phase.

2009 ◽  
Vol 125 (4) ◽  
pp. 2494-2494
Author(s):  
Behrooz Yousefzadeh ◽  
Murray Hodgson
Keyword(s):  
Ray Tracing ◽  
Sound Propagation ◽  
Ray Tracing Model

Sound propagation in the two dimensional magnetic system K2NiF4

1976 ◽  
Vol 56 (6) ◽  
pp. 479-480 ◽  
Author(s):  
G. Gorodetsky ◽  
B. Lüthi ◽  
M. Eibschütz ◽  
H.J. Guggenheim
Keyword(s):  
Sound Propagation ◽  
Magnetic System ◽  
Two Dimensional
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