Outdoor Sound Propagation Modelling In Complex Environments Recent Developments In The Parabolic Equation Method

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Outdoor Sound Propagation Modelling in Complex Environments: Recent Developments in the Parabolic Equation Method

Author :
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Outdoor Sound Propagation Modelling in Complex Environments: Recent Developments in the Parabolic Equation Method by :

Download or read book Outdoor Sound Propagation Modelling in Complex Environments: Recent Developments in the Parabolic Equation Method written by and published by . This book was released on 2006 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Nonlinear Acoustic Wave Propagation in Complex Media

Author : Thomas Leissing
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (758 download)

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Book Synopsis Nonlinear Acoustic Wave Propagation in Complex Media by : Thomas Leissing

Download or read book Nonlinear Acoustic Wave Propagation in Complex Media written by Thomas Leissing and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research aims at developing and validating a numerical model for the study of blast wave propagation over large distances and over urban environments. The approach consists in using the Nonlinear Parabolic Equation (NPE) model as a basis. The model is then extended to handle various features of sound propagation outdoors (non-flat ground topographies, porous ground layers, etc.). The NPE is solved using the finite-difference method and is proved to be in good agreement with other numerical methods. This deterministic model is then used as a basis for the construction of a stochastic model for sound propagation over urban environments. Information Theory and the Maximum Entropy Principle enable the construction of a probabilistic model of uncertainties, which takes into account the variability of the urban environment within the NPE model. Reference results are obtained with an exact numerical method and allow us to validate the theoretical developments and the approach used.

Using the Green's Function Parabolic Equation Method to Predict Sound Propagation Outdoors in the Presence of Weather and Complex Terrain

Download Using the Green's Function Parabolic Equation Method to Predict Sound Propagation Outdoors in the Presence of Weather and Complex Terrain PDF Online Free

Author : Whitney L. Coyle
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.:/5 (835 download)

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Book Synopsis Using the Green's Function Parabolic Equation Method to Predict Sound Propagation Outdoors in the Presence of Weather and Complex Terrain by : Whitney L. Coyle

Download or read book Using the Green's Function Parabolic Equation Method to Predict Sound Propagation Outdoors in the Presence of Weather and Complex Terrain written by Whitney L. Coyle and published by . This book was released on 2012 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Predicting Outdoor Sound

Author : Keith Attenborough
Publisher : CRC Press
ISBN 13 : 0429894821
Total Pages : 579 pages
Book Rating : 4.4/5 (298 download)

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Book Synopsis Predicting Outdoor Sound by : Keith Attenborough

Download or read book Predicting Outdoor Sound written by Keith Attenborough and published by CRC Press. This book was released on 2021-03-03 with total page 579 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of Predicting Outdoor Sound is an up-to-date reference on the propagation of sound close to the ground and its prediction. New content includes comparisons between predictions and data for road traffic, railway and wind turbine noise; descriptions of source characteristics in the HARMONOISE model; propagation over rough seas, parallel low walls, and lattices; outlines of numerical methods; gabion (caged stones) and sonic crystal noise barriers; meteorological effects on noise barrier performance; and the prediction requirements for auralization. The book brings together relevant theories, prediction schemes, and data, thereby providing a basis for determining what model or scheme might be applicable for any situation. It also offers a background on useful analytical approximations and the restrictions, as well as difficulties and limitations associated with engineering prediction schemes. The text should be of considerable interest to researchers in outdoor sound propagation and, more generally, it should provide a comprehensive primer on the topic for lecturers, consultants and students in acoustics and noise control.

Report

Author : Marta Galindo Arranz
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (912 download)

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Book Synopsis Report by : Marta Galindo Arranz

Download or read book Report written by Marta Galindo Arranz and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Use of the Parabolic Equation Method in Sound Propagation Modelling

Author : Finn Jensen
Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis The Use of the Parabolic Equation Method in Sound Propagation Modelling by : Finn Jensen

Download or read book The Use of the Parabolic Equation Method in Sound Propagation Modelling written by Finn Jensen and published by . This book was released on 1975 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

The Parabolic Equation Method for Outdoor Sound Propagation

Author : Marta Galindo Arranz
Publisher :
ISBN 13 :
Total Pages : 163 pages
Book Rating : 4.:/5 (257 download)

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Book Synopsis The Parabolic Equation Method for Outdoor Sound Propagation by : Marta Galindo Arranz

Download or read book The Parabolic Equation Method for Outdoor Sound Propagation written by Marta Galindo Arranz and published by . This book was released on 1996 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Applied Mechanics Reviews

Author :
Publisher :
ISBN 13 :
Total Pages : 1116 pages
Book Rating : 4.:/5 (26 download)

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Book Synopsis Applied Mechanics Reviews by :

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1962 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Journal of the Acoustical Society of America

Author : Acoustical Society of America
Publisher :
ISBN 13 :
Total Pages : 1114 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis The Journal of the Acoustical Society of America by : Acoustical Society of America

Download or read book The Journal of the Acoustical Society of America written by Acoustical Society of America and published by . This book was released on 2006 with total page 1114 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author :
Publisher : CRC Press
ISBN 13 : 1135439621
Total Pages : 1142 pages
Book Rating : 4.1/5 (354 download)

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Book Synopsis by :

Download or read book written by and published by CRC Press. This book was released on with total page 1142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Springer Handbook of Acoustics

Author : Thomas Rossing
Publisher : Springer Science & Business Media
ISBN 13 : 0387304460
Total Pages : 1179 pages
Book Rating : 4.3/5 (873 download)

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Book Synopsis Springer Handbook of Acoustics by : Thomas Rossing

Download or read book Springer Handbook of Acoustics written by Thomas Rossing and published by Springer Science & Business Media. This book was released on 2007-06-21 with total page 1179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an unparalleled modern handbook reflecting the richly interdisciplinary nature of acoustics edited by an acknowledged master in the field. The handbook reviews the most important areas of the subject, with emphasis on current research. The authors of the various chapters are all experts in their fields. Each chapter is richly illustrated with figures and tables. The latest research and applications are incorporated throughout, including computer recognition and synthesis of speech, physiological acoustics, diagnostic imaging and therapeutic applications and acoustical oceanography. An accompanying CD-ROM contains audio and video files.

Acoustics in Moving Inhomogeneous Media

Author : Vladimir E. Ostashev
Publisher : CRC Press
ISBN 13 : 1482266652
Total Pages : 537 pages
Book Rating : 4.4/5 (822 download)

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Book Synopsis Acoustics in Moving Inhomogeneous Media by : Vladimir E. Ostashev

Download or read book Acoustics in Moving Inhomogeneous Media written by Vladimir E. Ostashev and published by CRC Press. This book was released on 2015-09-18 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduces Systematic Formulations for Use in Acoustic ApplicationsAcoustics in Moving Inhomogeneous Media, Second Edition offers a uniquely complete and rigorous study of sound propagation and scattering in moving media with deterministic and random inhomogeneities. This study is of great importance in many fields including atmospheric and oceanic

Sound Synthesis, Propagation, and Rendering

Author : Shiguang Liu
Publisher : Morgan & Claypool Publishers
ISBN 13 : 1636393217
Total Pages : 110 pages
Book Rating : 4.6/5 (363 download)

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Book Synopsis Sound Synthesis, Propagation, and Rendering by : Shiguang Liu

Download or read book Sound Synthesis, Propagation, and Rendering written by Shiguang Liu and published by Morgan & Claypool Publishers. This book was released on 2022-03-24 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a broad overview of research on sound simulation driven by a variety of applications. Vibrating objects produce sound, which then propagates through a medium such as air or water before finally being heard by a listener. As a crucial sensory channel, sound plays a vital role in many applications. There is a well-established research community in acoustics that has studied the problems related to sound simulation for six decades. Some of the earliest work was motivated by the design of concert halls, theaters, or lecture rooms with good acoustic characteristics. These problems also have been investigated in other applications, including noise control and sound design for urban planning, building construction, and automotive applications. Moreover, plausible or realistic sound effects can improve the sense of presence in a virtual environment or a game. In these applications, sound can provide important clues such as source directionality and spatial size. The book first surveys various sound synthesis methods, including harmonic synthesis, texture synthesis, spectral analysis, and physics-based synthesis. Next, it provides an overview of sound propagation techniques, including wave-based methods, geometric-based methods, and hybrid methods. The book also summarizes various techniques for sound rendering. Finally, it surveys some recent trends, including the use of machine learning methods to accelerate sound simulation and the use of sound simulation techniques for other applications such as speech recognition, source localization, and computer-aided design.

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 880 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Unattended Ground Sensor Technologies and Applications V

Author : Edward M. Carapezza
Publisher : SPIE-International Society for Optical Engineering
ISBN 13 :
Total Pages : 534 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Unattended Ground Sensor Technologies and Applications V by : Edward M. Carapezza

Download or read book Unattended Ground Sensor Technologies and Applications V written by Edward M. Carapezza and published by SPIE-International Society for Optical Engineering. This book was released on 2003 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fundamentals of Geophysical Data Processing

Author : Jon F. Claerbout
Publisher : McGraw-Hill Companies
ISBN 13 :
Total Pages : 296 pages
Book Rating : 4.:/5 (42 download)

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Book Synopsis Fundamentals of Geophysical Data Processing by : Jon F. Claerbout

Download or read book Fundamentals of Geophysical Data Processing written by Jon F. Claerbout and published by McGraw-Hill Companies. This book was released on 1976 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Ocean Noise and Marine Mammals

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309133157
Total Pages : 220 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Ocean Noise and Marine Mammals by : National Research Council

Download or read book Ocean Noise and Marine Mammals written by National Research Council and published by National Academies Press. This book was released on 2003-05-22 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the 119 species of marine mammals, as well as for some other aquatic animals, sound is the primary means of learning about the environment and of communicating, navigating, and foraging. The possibility that human-generated noise could harm marine mammals or significantly interfere with their normal activities is an issue of increasing concern. Noise and its potential impacts have been regulated since the passage of the Marine Mammal Protection Act of 1972. Public awareness of the issue escalated in 1990s when researchers began using high-intensity sound to measure ocean climate changes. More recently, the stranding of beaked whales in proximity to Navy sonar use has again put the issue in the spotlight. Ocean Noise and Marine Mammals reviews sources of noise in the ocean environment, what is known of the responses of marine mammals to acoustic disturbance, and what models exist for describing ocean noise and marine mammal responses. Recommendations are made for future data gathering efforts, studies of marine mammal behavior and physiology, and modeling efforts necessary to determine what the long- and short-term impacts of ocean noise on marine mammals.