Ostashev / Wilson Acoustics in Moving Inhomogeneous Media, Second Edition

2. Auflage 2014
ISBN: 978-1-4822-6665-8
Verlag: Taylor & Francis
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 542 Seiten

Introduces Systematic Formulations for Use in Acoustic Applications

Acoustics 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 acoustics, aeroacoustics, acoustics of turbulent flows, remote sensing of the atmosphere and ocean, noise pollution in the atmosphere, and wave propagation.

Provides Sensible Explanations Using Step-by-Step Practice

The book begins by considering sound propagation through moving media with deterministic inhomogeneities such as vertical profiles of temperature and wind velocity in the atmosphere. It moves on to a new study of sound propagation and scattering in media with random inhomogeneities in adiabatic sound speed, density, and medium velocity. Then this second edition newly sets out state-of-the-art numerical methods for calculating the sound field and its statistical characteristics in moving inhomogeneous media, which is particularly useful for those working in atmospheric acoustics and studying noise pollution. Numerical codes are provided on the book’s website www.crcpress.com/product/isbn/9780415564168

Covered in three parts, this second edition:

- Incorporates new results developed since the previous edition

- Rewrites and extends the text with formulations of sound propagation and scattering in random moving media

- Describes numerical methods for performing calculations involving equations from the first two parts

Acoustics in Moving Inhomogeneous Media, Second Edition serves as the basis of a graduate course in atmospheric and oceanic acoustics or as a rigorous reference work in a wide range of fields such as atmospheric and oceanic acoustics, aeroacoustics, acoustics of turbulent flows, acoustic remote sensing, noise pollution, and wave propagation in deterministic and random media.

Autoren/Hrsg.

Ostashev, Vladimir E.

Wilson, D. Keith

Inhaltsverzeichnis

I Theoretical foundations of acoustics in moving media

Introduction to acoustics in a moving medium

Historical review

Sound propagation in the atmosphere

Effects of currents on sound propagation in the ocean

Equations for acoustic and internal gravity waves in an inhomogeneous moving medium

Fluid dynamic equations and their linearization

Stratified medium

Exact equation for acoustic and internal gravity waves in a stratified medium

Equations for acoustic waves in a three-dimensional inhomogeneous medium

Parabolic equations for acoustic waves

Geometrical acoustics in an inhomogeneous moving medium

Geometrical acoustics in a space- and time-varying medium

Eikonal equation and acoustic energy conservation in a time independent medium

Sound propagation in a three-dimensional inhomogeneous medium

Refraction laws for a sound ray and the normal to a wavefront in a stratified medium

Sound propagation in a stratified medium

Approximate equations for the eikonal and sound ray path

Acoustic tomography of the atmosphere

Wave theory of sound propagation in a stratified moving medium

Starting equations of wave theory

Acoustic sources

Sound propagation in a homogeneous flow and reflection by a homogeneous moving layer

High-frequency approximation for the sound field

High-frequency sound field of a point source above an impedance surface in a stratified medium

Discrete spectrum of a sound field

Moving sound sources and receivers

Sound field for a moving source in a homogeneous motionless medium

Sound field for a moving source in an inhomogeneous moving medium

Sound aberration and the change in propagation direction of a sound wave emitted by a moving source

Doppler effect in an inhomogeneous moving medium

II Sound propagation and scattering in random moving media

Random inhomogeneities in a moving medium and scattering of sound

Statistical description of random inhomogeneities

Spectra of turbulence

Fluctuations in the sound speed and density

Scattering cross-section

Line-of-sight sound propagation in a random moving medium

Parabolic equation and Markov approximation in a random moving medium

Phase and log-amplitude fluctuations for arbitrary spectra

Phase and log-amplitude fluctuations for the turbulence spectra

Statistical moments of the sound field

Mean sound field and mutual coherence for the turbulence spectra

Experimental data on sound propagation in random moving media

Multipath sound propagation in a random moving medium

Interference of the direct and surface-reflected waves in a random medium

Statistical moments of the sound field above an impedance boundary in a refractive, turbulent medium

Theory of multiple scattering: mean field

Theory of multiple scattering: mutual coherence function

III Numerical methods for sound propagation in moving media

Numerical representation of random fields

Spectral methods

Eddy (quasi-wavelet) methods

Ray acoustics and ground interactions

Sound levels and transmission loss

Interactions with the ground

Ray tracing in a moving medium

Wave-based frequency-domain methods

Wavenumber integration

Parabolic equation

Wave-based time-domain methods

Uncertainty in sound propagation and its quantification

Bibliography

Index

Über Autor(innen)

Dr. Vladimir E. Ostashev is a senior research scientist at the Cooperative Institute for Research in Environmental Sciences (CIRES) of the University of Colorado at Boulder (CU) and a government expert for the U.S. Army Engineer Research and Development Center. He received a Ph.D. in physics from the Moscow Physics and Technology Institute, Russia in 1979. Since 1979, he has worked at the Institute of Atmospheric Physics (Moscow, Russia), Acoustics Institute (Moscow, Russia), and New Mexico State University (Las Cruces, NM), and is an associate editor of the Journal of the Acoustical Society of America and JASA Express Letters.

Dr. D. Keith Wilson is a research physical scientist with the U.S. Army Engineer Research and Development Center (ERDC), in Hanover, NH. He received a Ph.D. in acoustics from the Pennsylvania State University in 1992. Dr. Wilson has been awarded U.S. Army Research and Development Achievement Awards on four occasions and received the U.S. Army Meritorious Civilian Service Award in 2012. He is associate editor of the Journal of the Acoustical Society of America, founding editor of JASA Express Letters, and a member of the Acoustical Society of America, the Institute for Noise Control Engineering, and the American Meteorological Society.