[PDF] Underwater Sound Propagation Loss Program eBook

Author : D. F. Gordon
Publisher :
Page : 0 pages
File Size : 12,70 MB
Release : 1979
Category : Ocean bottom
ISBN :

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A normal-mode program for a sound-speed profile of an arbitrary number of layers has been constructed. It has been used extensively and successfully for 12 years to compute sound propagation in idealized underwater acoustic ducts. Documentation is contained for those who wish to use or modify this program. The FORTRAN statements are given for both the normal-mode and a mode-follower program. The numerical anaysis necessary for computing modified Hankel functions of order 1/3 is given. The analysis includes a continued fraction technique. (Author).

Author : Thomas Rossing
Publisher : Springer Science & Business Media
Page : 1179 pages
File Size : 19,69 MB
Release : 2007-06-21
Category : Science
ISBN : 0387304460

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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.

Author : E. R. Anderson
Publisher :
Page : 32 pages
File Size : 33,44 MB
Release : 1956
Category :
ISBN :

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The efficient use of the Navy's increasingly complex sonar systems depends on a detailed knowledge of the behavior of the acoustic energy contained in the underwater acoustic paths which they employ. Once the behavior of the acoustic energy is understood then operational prediction in terms of equipment and environmental parameters becomes possible. In trying to obtain an objective understanding of the nature of the propagation of acoustic energy in the convergence zone and the surface channel paths, much effort has been devoted to the prediction of intensity fields. This report discusses: (1) an acoustic intensity program for estimating convergence zone propagation loss using ray theory; (2) an acoustic intensity program for estimating propagation loss associated with surface channels using normal mode theory; (3) work at NEl summarizing information on the oceanographic variables pertinent to these intensity computations.

Author : H. W. Marsh
Publisher :
Page : 220 pages
File Size : 22,11 MB
Release : 1962
Category : Sound
ISBN :

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The subject "Underwater Sound" covers phenomena as complex and diverse as the imagination and patience of the investigator will allow. An important part of the subject deals with the sonar parameters, in the form of loss or strength coefficients. During the twenty years that appreciable effort has been expended in experimentation and analysis, the great emphasis has been in two areas; a) Quantitative investigation of the sonar parameters; b) Quantitative investigation of the ocean environment. Knowledge of the environment has been applied to the estimation of the parameters, and to the description of other aspects of underwater sound.

Author : P.C. Etter
Publisher : CRC Press
Page : 364 pages
File Size : 48,46 MB
Release : 1995-11-30
Category : Architecture
ISBN : 9780419201908

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Underwater Acoustic Modeling provides the only comprehensive source on how to translate our physical understanding of sound in the sea into mathematical formulas solvable by computers.

Author : J. Northrop
Publisher :
Page : 17 pages
File Size : 39,74 MB
Release : 1980
Category :
ISBN :

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Oceanic great circle paths of nearly 180 deg of arc exist between the water just west of Perth, Australia, and Bermuda. Archived sound-speed profiles at eight locations along this path were used, along with bathymetric data, as input to the RAYWAVE ray-tracing program to compute the effective horizontal sound speed and propagation loss over slightly different paths of 19,762.9 km and 19,806.8 km range. The sound speeds thus computed were 1480.9 + or - 0.9 and 1479.8 + or - 0.6 m/s, which compare favorably with the previously measured sound speeds (1484.7 + or - 3.7 and 1481.48 + or - 0.6 m/s, respectively). Propagation loss of 162 dB over this propagation path is effectively modeled by assuming spherical spreading out a range of 10 nautical miles and semispherical spreading (15 log r) beyond, plus attenuation of 1.75 dB per 500 nautical miles. The RAYWAVE propagation loss prediction, after adjustment of the propagation path around Crozet Island, is 156 dB in the 10- to 50-Hz band. (Author).

Author : Michael Ainslie
Publisher : Springer Science & Business Media
Page : 727 pages
File Size : 14,83 MB
Release : 2010-09-14
Category : Technology & Engineering
ISBN : 3540876626

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Sonar performance modelling (SPM) is concerned with the prediction of quantitative measures of sonar performance, such as probability of detection. It is a multi-disciplinary subject, requiring knowledge and expertise in the disparate fields of underwater acoustics, acoustical oceanography, sonar signal processing and statistical detection theory. No books have been published on this subject, however, since the 3rd edition of Urick’s classic work 25 years ago and so Dr Ainslie’s book will fill a much-needed gap in the market. Currently, up-to-date information can only be found, in different forms and often with conflicting information, in various journals, conference and textbook publications. Dr Michael Ainslie is eminently qualified to write this unique book. He has worked on sonar performance modeling problems since 1983. He has written many peer reviewed research articles and conference papers related to sonar performance modeling, making contributions in the fields of sound propagation and detection theory.