scholarly journals Simple Estimation of Sound Source Directivity in Diffused Acoustic Field: Numerical Simulation

2019 ◽  
Vol 33 (5) ◽  
pp. 421-426
Author(s):  
Kookhyun Kim
Keyword(s):  
Numerical Simulation ◽  
Acoustic Field ◽  
Sound Source ◽  
Source Directivity ◽  
Simple Estimation

Numerical Simulation of Acoustic Field for the Miniature Cylindrical Transducer with a Rectangular Hole

2011 ◽  
Vol 421 ◽  
pp. 739-742
Author(s):  
Li Li Yu ◽  
Jin Hua Zhao ◽  
Quan Zhou Zhao ◽  
Chun Hui
Keyword(s):  
Numerical Simulation ◽  
Acoustic Field ◽  
Focal Plane ◽  
Optimization Design ◽  
Acoustic Pressure ◽  
Pressure Amplitude ◽  
Hole Size ◽  
Rectangular Hole ◽  
Cylindrical Transducer ◽  
Focusing Properties

In this paper the characteristics of acoustic field for miniature cylindrical focused transducer with a hole was studied in order to instruct the optimization design of the transducer for both realizing visualization and improving the treatment effect. Then the acoustic field was simulated numerically with different parameters of hole. It is found that position of focus is almost unchanged but acoustic pressure amplitude declines. In addition the performance of transverse focusing for the focal plane and levels length of acoustic pressure are lowered. Moreover, if size of transducer and rigidity of material permit, the area and ratio of width to height for the hole should be reduced appropriately to improve the focusing properties. And it is deduced that area and ratio of width to height for the cylinder can be increased to achieve the same therapeutic effect with a fixed hole size.

Numerical simulation of aerodynamic sound source in the wake of a complex object

2000 ◽  
Author(s):  
Chisaschi Kato ◽  
Akiyoshi Iida ◽  
Morishige Hattori ◽  
Satoru Inadama
Keyword(s):  
Numerical Simulation ◽  
Sound Source ◽  
Complex Object ◽  
Aerodynamic Sound

scholarly journals Estimating the influence of double-sided rounded screens on the acoustic field around a linear sound source

2021 ◽  
Vol 3 (5 (111)) ◽  
pp. 38-46
Author(s):  
Vitalii Didkovskyi ◽  
Vitaly Zaets ◽  
Svetlana Kotenko ◽  
Volodymyr Denysenko ◽  
Yuriy Didenko
Keyword(s):  
Acoustic Field ◽  
Cross Sections ◽  
Sound Source ◽  
Finite Thickness ◽  
Sound Field ◽  
Algebraic Equations ◽  
The Road ◽  
Study Results ◽  
On The Road ◽  
The Impact

This paper reports a study into the acoustic field of transport flow around noise protection screens located on both sides of the sound source. Most research on noise protection involving noise protection screens relates to the assessment of the effectiveness of screens located on one side of the noise source. The influence of the second screen on the effectiveness of the first one has been investigated only experimentally. Therefore, it is a relevant task to assess the mutual impact of the two screens between which the linear sound source is located. A problem was stated in such a way that has made it possible to derive an analytical solution and find a sound field around a linear sound source. In this case, the sound source was limited on both sides by acoustically rigid screens with finite thickness. The screens' cross-sections were shaped as part of a ring with arbitrary angles and the same radius. The problem was solved by the method of partial domains. This method has made it possible to obtain an infinite system of algebraic equations that were solved by the method of reduction. Such an approach to solving a problem allows a given solution to be applied for different cases of the mutual location of screens, source, and territory protected from noise. The study results help estimate a field between the screens, the dependence of increasing sound pressure on the road on the geometric size of the screen and the width of the road. In addition, the solution resulted in the ability to assess the impact of one screen on the efficiency of another in the frequency range of up to 1,000 Hz. It has been shown that the mutual impact of screens could reduce the screen efficiency by 2 times. The study reported here could make it possible to more accurately calculate the levels of the sound field from traffic flows when using noise protection screens, which is often performed in practice when designing new and reconstructing existing highways.

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