Dynamics of Acoustic Resonance Scattering from Spherical Targets PDF Download
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Author: J. George
Publisher:
ISBN:
Category :
Languages : en
Pages : 66
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Book Description
A resonance theory of acoustic scattering from penetrable bodies has recently been developed which describes the features of the scattering amplitude in terms of a background amplitude like that of an impenetrable scatter, with superimposed resonances at the eigenfrequencies of the body. In the present study (carried out for the example of a spherical gas bubble in a fluid which in spite of its simplicity contains all the essential features of the scattering process), the existence of these resonances is explained by the phase-matching of surface waves on the scatter whose phase and group velocities are obtained here. In addition, we study the dynamics of the interior motions inside the body during the scattering process, which are shown to undergo resonances in the radial and angular directions except for the radial motions of the surface, resulting in the fact that the modal surface deformations do not exhibit any particular resonance effects at the eigenfrequencies of the body.
Author: J. George
Publisher:
ISBN:
Category :
Languages : en
Pages : 66
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Book Description
A resonance theory of acoustic scattering from penetrable bodies has recently been developed which describes the features of the scattering amplitude in terms of a background amplitude like that of an impenetrable scatter, with superimposed resonances at the eigenfrequencies of the body. In the present study (carried out for the example of a spherical gas bubble in a fluid which in spite of its simplicity contains all the essential features of the scattering process), the existence of these resonances is explained by the phase-matching of surface waves on the scatter whose phase and group velocities are obtained here. In addition, we study the dynamics of the interior motions inside the body during the scattering process, which are shown to undergo resonances in the radial and angular directions except for the radial motions of the surface, resulting in the fact that the modal surface deformations do not exhibit any particular resonance effects at the eigenfrequencies of the body.
Author: Herbert Überall
Publisher: CRC Press
ISBN: 9782881245138
Category : Science
Languages : en
Pages : 364
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Book Description
These 13 papers were part of a May 1989 symposium at the Catholic University of America, Washington, D.C., the home of much of the early theoretical and experimental work in acoustic resonance scattering. Topics include a historical survey of the development of the subject, a description of the MIIR and short- pulse methods, and new developments such as the derivation of exact acoustic background shells, application of the method of moments, and S-matrix product expansions. Annotation copyright by Book News, Inc., Portland, OR
Author: G. C. Gaunaurd
Publisher:
ISBN:
Category :
Languages : en
Pages : 65
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Book Description
SPHERICAL TARGETS. In acoustic scattering from elastic objects, resonances features appear in the returned echo at frequencies where the objects eigenfrequencies are located, which are explained by the excitation of interior creeping waves. Corresponding resonance terms may be split off from the total scattering amplitude, leaving behind an apparently nonresonant background amplitude. This is demonstrated here for scatterers of spherical geometry, and in the following companion paper also for scatterers or arbitrary geometry, using the T-matrix approach. For the case of near-impenetrable spheres, it is subsequently shown that the background amplitude can be split further into specularly reflected contributions, plus highly attenuated resonance terms which are explained by the excitation of exterior (Franz-type) creeping waves. The singularity structure of the scattering function is shown mathematically, using the R-matrix approach of Nuclear scattering theory, as that of a meromorphic function without any additional 'entire function' (as had been postulated by the Singularity Expansion Method). (Author).
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1048
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Author: Ardshir Guran
Publisher: World Scientific
ISBN: 9789812778536
Category : Mathematics
Languages : en
Pages : 522
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Book Description
This series of volumes constitutes an outstanding collection of contributions by the most active research workers in the area of acoustics and mechanics. It brings the reader up to date on the status of the various aspects of research in this field. The volumes should preserve their value for a long time, as they represent a monument to the achievements of human research capabilities in the underwater-acoustics aspects of the environment.
Author: Acoustical Society of America
Publisher:
ISBN:
Category : Acoustical engineering
Languages : en
Pages : 988
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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 568
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Author: J. Dera
Publisher: Elsevier
ISBN: 0080870910
Category : Science
Languages : en
Pages : 527
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Book Description
In trying to discover as much as possible about the marine environment, oceanography has split into many subdisciplines, each represented by innumerable publications. To date however, there has been no concise synthesis introducing readers to the whole array of physical processes in the sea, and showing how these processes are related to one another and to other natural phenomena. The author of Marine Physics aims to fill this gap.The volume presents energy and mass transfer processes in the marine environment together with an explanation of their effects on other processes. Starting with a general introduction to the thermodynamics of ocean waters, there follow chapters on radiation transfer processes; the molecular exchange of mass, heat and momentum; the turbulent exchange of mass, heat and momentum; small-scale air-sea interactions; modelling the surface boundary layer; and the propagation of acoustic waves in the sea. The discussions begin with physical principles and culminate in a presentation of current research problems. The volume is completed with the presentation of basic quantities, equations, formulas and diagrams, as well as indexes and 576 literature references. This volume should be an invaluable resource to post-graduates and scientists in the fields of engineering and oceanography, and for those interested in the protection or exploitation of the marine environment.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 1246
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 704
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