Frequency and Time Numerical Solutions of 3D Sound Propagation in Open and Closed Spaces

2000 ◽  
Vol 7 (4) ◽  
pp. 247-261 ◽  
Author(s):  
António Tadeu ◽  
Julieta António ◽  
Luís Godinho
Keyword(s):  
Numerical Solutions ◽  
Sound Propagation ◽  
3D Sound

SOUND PROPAGATION THROUGH STRUCTURAL COMPONENTS UNDER CONDITIONS OF NON-RIGID CONTACT AT THE BOUNDARIES BETWEEN THEM

Akustika ◽  
2021 ◽  
Author(s):  
Konstantin Abbakumov ◽  
Anton Vagin ◽  
Alena Vjuginova
Keyword(s):  
Boundary Conditions ◽  
Inhomogeneous Medium ◽  
Dispersion Equation ◽  
Numerical Solutions ◽  
Sound Propagation ◽  
Structural Components ◽  
Frequency Range ◽  
Problem Statement ◽  
Ultrasonic Measurements ◽  
Rigid Contact

The report considers the problem statement, derivation and solution of the dispersion equation for sound propagation in a layered inhomogeneous medium with oriented fracturing, simulated by the presence of boundary conditions in the "linear slip" approximation. Numerical solutions are obtained and analyzed for the frequency range and values of the parameters of contact breaking, which is relevant in the problems of ultrasonic measurements

Aeroacoustic Predictions Using High-Order Shock-Capturing Schemes

2003 ◽  
Vol 2 (2) ◽  
pp. 175-192 ◽  
Author(s):  
John A. Ekaterinaris
Keyword(s):  
Numerical Solutions ◽  
Sound Propagation ◽  
Finite Difference Methods ◽  
High Order ◽  
Curvilinear Coordinates ◽  
Compressible Turbulence ◽  
Test Problems ◽  
Complex Flows ◽  
Time Marching ◽  
Implicit And Explicit

High-order accurate, finite-difference methods, such as the compact centered schemes with spectral-type or characteristic-based filters and the weighted essentially non-oscillatory (WENO) schemes, which are used in high resolution CFD solutions and for DNS or LES of compressible turbulence, are applied to aeroacoustics. Implicit and explicit schemes are used for time marching. The accuracy of the numerical solutions is evaluated for test problems. It is found that these methods are appropriate for sound propagation in complex flows that require use of curvilinear coordinates. Therefore they are applicable for the prediction of sound generation from both smooth subsonic flows, and transonic or supersonic flows with discontinuities.

FORWARD AND BACKWARD MODAL STATISTICS FOR ROUGH SEABED SURFACE SCATTERING IN SHALLOW WATER

2014 ◽  
Vol 22 (01) ◽  
pp. 1440004 ◽  
Author(s):  
D. P. KNOBLES ◽  
J. D. SAGERS
Keyword(s):  
Shallow Water ◽  
Integral Equations ◽  
Rough Surface ◽  
Numerical Solutions ◽  
Sound Propagation ◽  
Surface Scattering ◽  
Coupled Equations ◽  
Random Rough Surface ◽  
Basic Characteristics

Addressed is the physics of sound propagation through a shallow water waveguide whose seabed has a random rough surface. The basic coupled integral equations for the modal amplitudes can be split into forward and backward going coupled integral equations. Numerical solutions of the coupled equations are obtained for multiple roughness realizations from which ensemble averages can be obtained for the modal intensities and cross-mode coherence as a function of range. Sample calculations illustrate some of the basic characteristics of the average cross-mode coherence and intensity with and without seabed attenuation and for different source depths on range scales of 1500 acoustic wavelengths.

scholarly journals Meteorological effects on the 3D sound propagation inside an inhomogeneous forest area

2016 ◽  
Vol 25 (3) ◽  
pp. 327-339
Author(s):  
Astrid Ziemann ◽  
Arthur Schady ◽  
Dietrich Heimann
Keyword(s):  
Sound Propagation ◽  
Forest Area ◽  
3D Sound ◽  
Meteorological Effects

scholarly journals Estimating Sound Exposure Levels Due to a Broadband Source over Large Areas of Shallow Sea

2022 ◽  
Vol 10 (1) ◽  
pp. 82
Author(s):  
Denis Manul’chev ◽  
Andrey Tyshchenko ◽  
Mikhail Fershalov ◽  
Pavel Petrov
Keyword(s):  
Sound Propagation ◽  
Acoustic Noise ◽  
Pulse Signal ◽  
Source Spectrum ◽  
Exposure Level ◽  
Propagation Modeling ◽  
Sound Exposure ◽  
3D Sound ◽  
Exposure Levels ◽  
Sea Area

3D sound propagation modeling in the context of acoustic noise monitoring problems is considered. A technique of effective source spectrum reconstruction from a reference single-hydrophone measurement is discussed, and the procedure of simulation of sound exposure level (SEL) distribution over a large sea area is described. The proposed technique is also used for the modeling of pulse signal waveforms at other receiver locations, and results of a direct comparison with the pulses observed in the experimental data is presented.

A numerical comparison between the multiple-scales and finite-element solution for sound propagation in lined flow ducts

2001 ◽  
Vol 437 ◽  
pp. 367-384 ◽  
Author(s):  
SJOERD W. RIENSTRA ◽  
WALTER EVERSMAN
Keyword(s):  
Finite Element ◽  
Numerical Solutions ◽  
Sound Propagation ◽  
Multiple Scales ◽  
Finite Element Solution ◽  
Numerical Comparison ◽  
Element Solution ◽  
Mean Flow ◽  
Flow Equations ◽  
Good Agreement

An explicit, analytical, multiple-scales solution for modal sound transmission through slowly varying ducts with mean flow and acoustic lining is tested against a numerical finite-element solution solving the same potential flow equations. The test geometry taken is representative of a high-bypass turbofan aircraft engine, with typical Mach numbers of 0.5–0.7, circumferential mode numbers m of 10–40, dimensionless wavenumbers of 10–50, and both hard and acoustically treated inlet walls of impedance Z = 2 − i. Of special interest is the presence of the spinner, which incorporates a geometrical complexity which could previously only be handled by fully numerical solutions. The results for predicted power attenuation loss show in general a very good agreement. The results for iso-pressure contour plots compare quite well in the cases where scattering into many higher radial modes can occur easily (high frequency, low angular mode), and again a very good agreement in the other cases.

scholarly journals 3D sound spatialization with game engines: the virtual acoustics performance of a game engine and a middleware for interactive audio design

2021 ◽  
Author(s):  
Hasan Baran Fırat ◽  
Luigi Maffei ◽  
Massimiliano Masullo
Keyword(s):  
Virtual Environments ◽  
Sound Propagation ◽  
Game Engine ◽  
Production Methods ◽  
3D Audio ◽  
3D Sound ◽  
Geometrical Acoustics ◽  
Game Engines ◽  
Virtual Acoustics ◽  
Sound Spatialization

AbstractThis study analyses one of the most popular game engines and an audio middleware to reproduce sound according to sound propagation physics. The analysis focuses on the transmission path between the sound source and the receiver. Even if there are several ready-to-use real-time auralization platforms and software, game engines' use with this aim is a recent study area for acousticians. However, audio design needs with game engines and the limits of their basic releases require additional tools (plugins and middleware) to improve both the quality and realism of sound in virtual environments. The paper discusses the use of Unreal Engine 4 and Wwise's 3D audio production methods in a set of different test environments. It assesses their performance in regard to a commercial geometrical acoustics software. The results show that the investigated version of the game engine and its sound assets are insufficient to simulate real-world cases and that significant improvements can be achieved with use of the middleware.

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