Application of the Parabolic Equation to the Outdoor Propagation of Sound PDF Download
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Author:
Publisher:
ISBN:
Category : Noise
Languages : en
Pages : 12
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Author:
Publisher:
ISBN:
Category : Noise
Languages : en
Pages : 12
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Author: Marta Galindo Arranz
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Category :
Languages : en
Pages :
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Author: Marta Galindo Arranz
Publisher:
ISBN:
Category :
Languages : en
Pages : 163
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Author: Michael James White
Publisher:
ISBN:
Category : Sound
Languages : en
Pages : 198
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Author:
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ISBN:
Category :
Languages : en
Pages : 17
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Book Description
In complex environments the modelling of outdoor sound propagation implies to take into account the mixed influence of ground characteristics (topography, obstacles, impedance, etc.) and atmospheric conditions (refraction and turbulence). During the last decade significant progress has been made in the modelling of sound propagation over distances ranging from hundreds meters to kilometres, and the agreement between calculated and measured fields has been greatly improved. New developments appear in the parabolic-equation method. In this paper we present a method which evaluates the propagation of an acoustic wave above uneven terrains including realistic meteorological parameters. In our approach the effects of the topography are modelled using appropriate rotated co-ordinates systems in order to treat the non-flat ground as a succession of flat domains. We also examine the influence of scale resolution on numerical simulation of long range sound propagation through the turbulent atmosphere. Currently, we generate the turbulence using a Random Fourier Modes technique, such that the turbulent fluctuation at any point in the medium (either scalar or vectorial in nature) is calculated from the sum of a chosen number of modes. Our model of outdoors sound propagation is validated both with classical numerical benchmark cases and recent outdoor experiments.
Author: Tetsuya Sakuma
Publisher: Springer
ISBN: 4431544542
Category : Technology & Engineering
Languages : en
Pages : 332
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Book Description
This book reviews a variety of methods for wave-based acoustic simulation and recent applications to architectural and environmental acoustic problems. Following an introduction providing an overview of computational simulation of sound environment, the book is in two parts: four chapters on methods and four chapters on applications. The first part explains the fundamentals and advanced techniques for three popular methods, namely, the finite-difference time-domain method, the finite element method, and the boundary element method, as well as alternative time-domain methods. The second part demonstrates various applications to room acoustics simulation, noise propagation simulation, acoustic property simulation for building components, and auralization. This book is a valuable reference that covers the state of the art in computational simulation for architectural and environmental acoustics.
Author: Whitney L. Coyle
Publisher:
ISBN:
Category :
Languages : en
Pages : 146
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Author: Finn Jensen
Publisher:
ISBN:
Category :
Languages : en
Pages : 50
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Book Description
The parabolic equation method (PE method) is the latest major development in the field of acoustic modelling. A detailed description of the derivation of the parabolic equation from the wave equation is given together with a description of a marching solution technique based on Fast Fourier Transforms (FFT). Limitations on the method in terms of allowable step length in range, number of FFT points to be used, and restrictions on pressure field behaviour in order to obtain a stable solution, are mentioned. Furthermore, numerical examples of propagation predictions are given for both shallow and deep water cases, with and without bottom absorption, and for both range-dependent and range-independent environmental conditions.
Author: Thomas L. Geers
Publisher: Springer Science & Business Media
ISBN: 9401590958
Category : Technology & Engineering
Languages : en
Pages : 335
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Book Description
This volume constitutes the proceedings of the 1997 IUTAM Symposium, where invited researchers in acoustics, aeronautics, elastodynamics, electromagnetics, hydrodynamics, and mathematics discussed non-reflecting computational boundaries. The participants formulated benchmark problems for evaluating computational boundaries, as described in the first article.
Author:
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ISBN:
Category : Forests and forestry
Languages : en
Pages : 136
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