Coupling boundary elements to a raytracing procedure

Hampel, S.; Langer, Sabine; Cisilino, Adrián P.

doi:10.1002/nme.2080

Cited by 12 publications

(5 citation statements)

References 16 publications

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“…Various spatial domain-decomposition methods have been proposed in the field of outdoor acoustics, typically combing a full-wave technique near the source, with the parabolic equation method [55] or a geometrical acoustics approach to reach far-away receivers [56].…”

Section: Hybrid Modellingmentioning

confidence: 99%

Efficient Outdoor Sound Propagation Modeling with the Finite-Difference Time-Domain (FDTD) Method: A Review

Renterghem

2014

International Journal of Aeroacoustics

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The finite-difference time-domain (FDTD) method, solving the inhomogeneous, moving medium sound propagation equations, also referred to as the Linearized Euler(ian) Equations (LEE), has become a mature reference outdoor sound propagation model during the last two decades. It combines the ability to account for complex wave-related effects like reflection, scattering and diffraction near or in between arbitrary objects, and complex medium-related effects like convection, refraction and (turbulent) scattering. In addition, it has the general advantages of a time-domain method. It is indicated that the numerical discretisation scheme should be chosen depending on the flow speed of the background medium. Perfectly matched layers, applicable to cases in presence of (non-)uniform flow, are state-ofthe-art perfectly absorbing boundary conditions that are key in outdoor sound propagation applications, where only a small part of the unbounded atmosphere can be numerically described. Various ways to include frequency-dependent outdoor soils are summarized, like time-domain impedance plane boundary conditions and explicitly including the upper part of the soil in the simulation domain. Approaches for long-distance sound propagation, including moving calculation frames and hybrid modeling are discussed. This review deals with linear sound propagation only. 1.INTRODUCTIONDuring the last two decades, time-domain modelling has received a lot of interest as it was shown to have great potential. One of the major advantages is that the response over a broad frequency range can be obtained with a single simulation run only, on condition that a short acoustic pulse is excited at the source position. Clearly, the spatial discretisation will limit the range of frequencies that can be sufficiently resolved. As analysis of a system's response is often more convenient in frequency domain, a Fourier transform can still provide the necessary information in a post-processing step. Time-domain models further allow including non-linear effects that appear near high amplitude sources. A timedomain approach directly models the waveform; therefore, its distortion can be captured, corresponding to a transfer of sound energy in between sound frequencies. The latter is less trivial in a frequency-domain technique, focusing on a single frequency at a time. In time domain, moving sources and related doppler-shifts, as well as transient behavior can be simulated directly. In addition, source localization using time-reversal techniques clearly need a time-domain approach. While traditionally sound propagation is treated in the frequency domain, time-domain approaches emerged in the last two decades mainly due to the increased access to computing power.Moving and inhomogeneous media may strongly effect sound propagation in the near field of realistic sources, as well as in the far field. Near airplanes, e.g., sound is emitted in a flowing medium, and the

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Section: Hybrid Modellingmentioning

confidence: 99%

Efficient Outdoor Sound Propagation Modeling with the Finite-Difference Time-Domain (FDTD) Method: A Review

Renterghem

2014

International Journal of Aeroacoustics

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“…BEM is well suited to compute the diffraction phenomena in the near field, while the ray tracing method (based on geometrical acoustics, as explained in the next paragraphs) is more effective to deal with the long distance refraction. Therefore it's possible to couple BEM and a ray tracing models in order to combine their results taking benefits from the advantages of both methods [24].…”

Section: Considerations On Such Methodsmentioning

confidence: 99%

Numerical modeling of environmental noise

Schenone

2012

2012 2nd International Conference on Advances in Computational Tools for Engineering Applications (ACTEA)

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Numerical modeling is a powerful tool to analyze outdoor noise propagation. Specific numerical techniques are needed to simulate the behavior of acoustic waves in the external environment. Ray tracing technique and beam tracing technique represent effective numerical methods, which are used in current simulation software. Several attenuation terms are to be considered during propagation, and their calculation deeply affects the accuracy of the modeling. Sources' characterization and dose-effect correlation are further key elements. In spite of these critical aspects, numerical modeling effectively applies to a number of different situation (roads, railways, airports, harbors, industries) in which noise pollution must be analyzed, predicted or reduced.

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“…Barbone et al developed a framework for the calculation of scattering coefficients using FEM and ray tracing [66]. Hampel et al combine BEM and ray tracing using a spatial decomposition approach [67]. Yeh et al propose a e two-way pressure coupling technique at the interface of near object and far-field regions [68] VIII.…”

Section: Numerical Techniquesmentioning

confidence: 99%

Sound propagation in 3D spaces using computer graphics techniques

Charalampous

Michael

2014

2014 International Conference on Virtual Systems &Amp; Multimedia (VSMM)

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Sound propagation in 3D spaces is governed by similar physical principles as light. As a result, sound rendering in a 3D virtual environment can benefit from methods developed for graphics rendering and vice versa. In this review, we provide an overview of methods used for sound rendering that share concepts and techniques with graphics rendering. Firstly we describe geometrical propagation techniques where the computations are based on ray theory similar to ray tracing techniques in computer graphics. Secondly, we review numerical techniques. These techniques, similar to the idea of radiosity, are based on the subdivision of the space into elements. Then we describe acceleration techniques that can be used in combination with other methods to speed up calculations. Lastly, for the sake of completeness, a quick overview is given of sound computation techniques that simulate specific sound effects that do not apply on illumination. The aim of this survey is to share knowledge among the two disciplines using familiar and known concepts.

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Coupling boundary elements to a raytracing procedure

Cited by 12 publications

References 16 publications

Efficient Outdoor Sound Propagation Modeling with the Finite-Difference Time-Domain (FDTD) Method: A Review

Efficient Outdoor Sound Propagation Modeling with the Finite-Difference Time-Domain (FDTD) Method: A Review

Numerical modeling of environmental noise

Sound propagation in 3D spaces using computer graphics techniques

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