Ocean Acoustic Propagation By Finite Difference Methods
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Ocean Acoustic Propagation By Finite Difference Methods
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Author : D. Lee
language : en
Publisher: Elsevier
Release Date : 2014-06-28
Ocean Acoustic Propagation By Finite Difference Methods written by D. Lee and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-06-28 with Science categories.
A concise guide to the theory and application of numerical methods for predicting ocean acoustic propagation, also providing an introduction to numerical methods, with an overview of those methods presently in use. An in-depth development of the implicit-finite-difference technique is presented together with bench-mark test examples included to demonstrate its application to realistic ocean environments. Other applications include atmospheric acoustics, plasma physics, quantum mechanics, optics and seismology.
Ocean Acoustics
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Author : J.A. DeSanto
language : en
Publisher: Springer
Release Date : 2011-12-23
Ocean Acoustics written by J.A. DeSanto and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-12-23 with Science categories.
This Topics volume is devoted to a study of sound propagation in the ocean. The effect of the interior of the ocean on underwater sound is analogous to the effect of a lens on light. The oceanic lens is related, as in light propagation, to the index of refraction of the medium. The latter is giv~n by the ratio of the sound frequency to the speed of sound in water, typi ca lly about 1500 m s -1. It is the vari ation of the sound speed due to changing temperature, density, salinity, and pres sure in the complex ocean environment which creates the lens effect. Many oceanic processes such as currents, tides, eddies (circulating, translating regions of wa ter), and internal waves (the wave-like structure of the oceanic density variabil ity) contri bute in turn to the changes in sound speed'. The net effect of the ocean lens is to trap and guide sound waves in a channel created by the lens. The trapped sound can then propagate thousands of miles in this oceanic waveguide. In addition to the propagation in the interior of the ocean, sound can propagate into and back out of the ocean bottom as well as scatter from the ocean surface. Just as the sound produced by a loudspeaker in a room is affected by the walls of the room, so the ocean boundaries and the material properties below the ocean bottom are essential ingredients in the problem.
Numerical Ocean Acoustic Propagation In Three Dimensions
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Author : Ding Lee
language : en
Publisher: World Scientific
Release Date : 1995-12-31
Numerical Ocean Acoustic Propagation In Three Dimensions written by Ding Lee and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-12-31 with Mathematics categories.
This book introduces a comprehensive mathematical formulation of the three-dimensional ocean acoustic propagation problem by means of functional and operator splitting techniques in conjunction with rational function approximations. It presents various numerical solutions of the model equation such as finite difference, alternating direction and preconditioning. The detailed analysis of the concept of 3D, N x 2D and 2D problems is very useful not only mathematically and physically, but also computationally. The inclusion of a complete detailed listing of proven computer codes which have been in use by a number of universities and research organizations worldwide makes this book a valuable reference source. Advanced knowledge of numerical methods, applied mathematics and ocean acoustics is not required to understand this book. It is oriented toward graduate students and research scientists to use for research and application purposes.
Fundamentals Of Ocean Acoustics
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Author : L.M. Brekhovskikh
language : en
Publisher: Springer Science & Business Media
Release Date : 2006-04-10
Fundamentals Of Ocean Acoustics written by L.M. Brekhovskikh and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-04-10 with Science categories.
This book provides an up-to-date introduction to the theory of sound propagation in the ocean. The text treats both ray and wave propagation and pays considerable attention to stochastic problems such as the scattering of sound at rough surfaces and random inhomogeneities. An introductory chapter that discusses the basic experimental data complements the following theoretical chapters. New material has been added throughout for this third edition. New topics covered include: - inter-thermocline lenses and their effect on sound fields - weakly divergent bundles of rays - ocean acoustic tomography - coupled modes - sound scattering by anisotropic volume inhomogeneities with fractal spectra - Voronovich's approach to sound scattering from the rough sea surface. In addition, the list of references has been brought up to date and the latest experimental data have been included.
Ocean Variability Acoustic Propagation
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Author : J. Potter
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Ocean Variability Acoustic Propagation written by J. Potter and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Fifteen years ago NATO organised a conference entitled 'Ocean Acoustic Modelling'. Many of its participants were again present at this variability workshop. One such participant. in concluding his 1975 paper, quoted the following from a 1972 literature survey: ' ... history presents a sad lack of communications between acousticians and oceanographers' Have we done any better in the last 15 years? We believe so, but only moderately. There is still a massive underdeveloped potential for acousticians and oceanographers to make significant progress together. Currently, the two camps talk together insufficiently even to avoid simple misun derstandings. such as those in Table 1. Table 1 Ocsanographic and acoustic jargon (from an idea by Pol/ardi Jargon Oceanographic use Acoustic use dbordB decibar (depth in m) decibel (energy level) PE primitive equations parabolic equations convergence zone converging currents converging rays (downwelling water) (high energy density) front thermohaline front wave, ray or time front speed water current speed sound propagation speed 1 The list goes on.
Computational Ocean Acoustics
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Author : Finn B. Jensen
language : en
Publisher: Springer Science & Business Media
Release Date : 2000-03-23
Computational Ocean Acoustics written by Finn B. Jensen and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-03-23 with Science categories.
"Many practical suggestions and tips; the examples are meaningful and the illustrations are effective....Destined to become a classic reference that any serious practitioner of ocean acoustics cannot afford to ignore." Revue de livre Authored by four internationally renowned scientists, this volume covers 20 years of progress in computational ocean acoustics and presents the latest numerical techniques used in solving the wave equation in heterogeneous fluid-solid media. The authors detail various computational schemes and illustrate many of the fundamental propagation features via 2-D color displays.
Numerical Ocean Acoustic Propagation In Three Dimensions
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Author : Ding Lee
language : en
Publisher: World Scientific
Release Date : 1995
Numerical Ocean Acoustic Propagation In Three Dimensions written by Ding Lee and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Science categories.
This book introduces a comprehensive mathematical formulation of the three-dimensional ocean acoustic propagation problem by means of functional and operator splitting techniques in conjunction with rational function approximations. It presents various numerical solutions of the model equation such as finite difference, alternating direction and preconditioning. The detailed analysis of the concept of 3D, N x 2D and 2D problems is very useful not only mathematically and physically, but also computationally. The inclusion of a complete detailed listing of proven computer codes which have been in use by a number of universities and research organizations worldwide makes this book a valuable reference source. Advanced knowledge of numerical methods, applied mathematics and ocean acoustics is not required to understand this book. It is oriented toward graduate students and research scientists to use for research and application purposes.
The Numerical Solution Of Underwater Acoustic Propagation Problems Using Finite Difference And Finite Element Methods
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Author : C. I. Goldstein
language : en
Publisher:
Release Date : 1984
The Numerical Solution Of Underwater Acoustic Propagation Problems Using Finite Difference And Finite Element Methods written by C. I. Goldstein and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
This report discusses various aspects of the numerical solution of underwater acoustic wave propagation problems. In the first part of the report, a model propagation problem based on the two-dimensional Helmholtz equation with a variable sound speed is considered. A finite element computer code for solving such problems was implemented at NRL on the VAX 11/780. A distinctive feature of the code is the implementation of a recently developed iterative method for solving the resulting large, sparse, indefinite, non-self-adjoint system of equations. This allowed for the efficient solution of over 35,000 complex equations on a relatively small computer. Some of the results obtained after applying this code to the model problem are described. Furthermore, additional modifications that can be made to the code to improve its efficiency and extend its applicability to more general propagation models are discussed. In the second part of this report, the general situation of the coupled acoustic/elastic wave equation in two and three dimensions is considered. For example, this may correspond to an ocean environment in which there is ice on the surface as well as an irregularly shaped bottom structure. Finite difference and finite element methods for solving both the time harmonic and time dependent models are discussed. Various issues are considered that are important in determining the size of the problem that can be adequately treated. This includes the computer power as well as the mathematical and modeling techniques available. (Author).
Sound Propagation In The Sea
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Author : Robert J. Urick
language : en
Publisher:
Release Date : 1979
Sound Propagation In The Sea written by Robert J. Urick and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Sound categories.
Finite Difference Modelling Of Acoustic Propagation And Its Applications In Underwater Acoustics
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Author : Andrew M. Hurrell
language : en
Publisher:
Release Date : 2002
Finite Difference Modelling Of Acoustic Propagation And Its Applications In Underwater Acoustics written by Andrew M. Hurrell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
