A parametric study of long-range atmospheric sound propagation using Bellhop Ray-tracing Model

2020 ◽  
Vol 148 (4) ◽  
pp. 2562-2562
Author(s):  
Hammad Hussain ◽  
Guillaume Dutilleux
Keyword(s):  
Ray Tracing ◽  
Long Range ◽  
Parametric Study ◽  
Sound Propagation ◽  
Ray Tracing Model

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

Prediction of Sound Level in Rooms and Experimental Validation

1997 ◽  
Vol 4 (2) ◽  
pp. 117-135
Author(s):  
Mauricy Cesar R. de Souza ◽  
Samir N.Y. Gerges
Keyword(s):  
Ray Tracing ◽  
Input Data ◽  
Sound Propagation ◽  
Power Level ◽  
Computing Time ◽  
Sound Field ◽  
Sound Level ◽  
Image Source ◽  
Geometric Acoustics ◽  
Ray Tracing Model

Traditional Sabine equations still are used for factories or offices where diffuse sound fields rarely occur and prediction can be inaccurate. More recently, methods based on geometric acoustics have been developed which require large computing time and which demand better defined input data. A problem, often encountered, is how to include input data which is appropriate, accurate and relatively easy to obtain. Three acoustic models of a furnished room were created: a diffuse field, an image source and a ray tracing model. The initial values of absorption coefficient and sound power level were obtained by standard measurements and the sound propagation SP was predicted and compared with measurement for each model. Then, the models were calibrated by altering the input parameters in order to minimise the difference between predicted and measured values. Sound pressure level due to two sources was also predicted and compared with measurement. For the room studied, the precision of the predictions, after calibration, is similar for the three models considered, with an average difference between simulated and measured values of less than 2 dB. Without the calibration procedure, the ray-tracing model gave the most precise first estimate. The diffuse and image source models needed significant modification of the input data to obtain a similar precision. The sound field in the room chosen for this study was nearly diffuse and simulation, based on geometric acoustics, did not offer clear advantages. However, this will not be the case for rooms with more complicated geometrical and acoustic characteristics such as in factories and offices. In addition, the image source model will not be appropriate for internal fittings which are much more complex than in the present study and an appropriate estimate of the scattering cross-section is problematical. In the ray tracing model, this problem is circumvented by incorporating the fittings as part of the geometry of the room.

INTERCOMPARATIVE STUDY OF LONG-YEAR WAVE HINDCASTING DATA SAMPLES BY USE OF BACKWARD RAY TRACING MODEL AND SWAN MODEL UNDER MSM-BASED WINDS CONDITION PROVIDED BY JMA

2018 ◽  
Vol 74 (4) ◽  
pp. I_457-I_462
Author(s):  
Masataka YAMAGUCHI ◽  
Hirokazu NONAKA ◽  
Yoshio HATADA ◽  
Yoshihiro UTSUNOMIYA ◽  
Kunimitsu INOUCHI ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Swan Model ◽  
Wave Hindcasting ◽  
Ray Tracing Model
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