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Author : J.-X. Zhou
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (274 download)
Download or read book Effect of Solitary Waves on Low-frequency Acoustic Propagation [in] Shallow Water written by J.-X. Zhou and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert J. Urick
Publisher :
ISBN 13 :
Total Pages : 268 pages
Book Rating : 4.:/5 (31 download)
Download or read book Sound Propagation in the Sea written by Robert J. Urick and published by . This book was released on 1979 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (946 download)
Download or read book Comparative Modeling and Analysis of Wideband Low Frequency Acoustic Propagation in the Shallow Water Environment written by and published by . This book was released on 2002 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: This grant was supported by the Ocean Acoustics Program in the Sensors and Systems Division of the Ocean, Atmosphere and Space D
Author :
Publisher :
ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.:/5 (76 download)
Download or read book Three-dimensional Analysis of Azimuthal Dependence of Sound Propagation Through Shallow-water Internal Solitary Waves written by and published by . This book was released on 2006 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results from shallow-water observational studies have shown acoustic field fluctuations in excess of 10 dB due primarily to non-linear internal solitary waves (ISWs). This work concentrates on three limitations ISWs pose to shallow-water acoustic propagation: anisotropy, quasi-deterministic-stochastic nature, and frequency dependence. These aspects are explored for low frequencies of 75 and 150 Hz through the development of a full-wave three-dimensional parabolic equation model in which a single ISW is introduced and rotated to achieve differing geometries between the ISW and acoustic transmission path. Two acoustic scattering regimes were found to exist: A horizontal refractive regime that generates very intense acoustic energy focusing and shadow zones near the ISW at range when the acoustic transmission path is nearly parallel to the ISW crest, and a vertical mode coupling regime producing moderate to strong acoustic energy focusing and shadow zones for all geometries. These three-dimensional patterns are similar for each frequency, but more intense for 150 Hz. The results dramatically show ISWs focus acoustic energy, dependent upon frequency and geometry, which may be exploitable in both a sonar performance and ambient noise modeling sense.
Author : Thomas Neighbors
Publisher : Elsevier
ISBN 13 : 0128112476
Total Pages : 982 pages
Book Rating : 4.1/5 (281 download)
Download or read book Applied Underwater Acoustics written by Thomas Neighbors and published by Elsevier. This book was released on 2017-01-19 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applied Underwater Acoustics meets the needs of scientists and engineers working in underwater acoustics and graduate students solving problems in, and preparing theses on, topics in underwater acoustics. The book is structured to provide the basis for rapidly assimilating the essential underwater acoustic knowledge base for practical application to daily research and analysis. Each chapter of the book is self-supporting and focuses on a single topic and its relation to underwater acoustics. The chapters start with a brief description of the topic’s physical background, necessary definitions, and a short description of the applications, along with a roadmap to the chapter. The subtopics covered within individual subchapters include most frequently used equations that describe the topic. Equations are not derived, rather, assumptions behind equations and limitations on the applications of each equation are emphasized. Figures, tables, and illustrations related to the sub-topic are presented in an easy-to-use manner, and examples on the use of the equations, including appropriate figures and tables are also included. Provides a complete and up-to-date treatment of all major subjects of underwater acoustics Presents chapters written by recognized experts in their individual field Covers the fundamental knowledge scientists and engineers need to solve problems in underwater acoustics Illuminates, in shorter sub-chapters, the modern applications of underwater acoustics that are described in worked examples Demands no prior knowledge of underwater acoustics, and the physical principles and mathematics are designed to be readily understood by scientists, engineers, and graduate students of underwater acoustics Includes a comprehensive list of literature references for each chapter
Author : Nicholas G. Pace
Publisher : Springer Science & Business Media
ISBN 13 : 9401006261
Total Pages : 592 pages
Book Rating : 4.4/5 (1 download)
Download or read book Impact of Littoral Environmental Variability on Acoustic Predictions and Sonar Performance written by Nicholas G. Pace and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: The limiting influence of the environment on sonar has long been recognised as a major challenge to science and technology. As the area of interest shifts towards the lit toral, environmental influences become dominant both in time and space. The manyfold challenges encompass prediction, measurement, assessment and adaptive responses to maximize the effectiveness of systems. Although MCM and ASW activities are dom inated in different ways and scales by the environment, both warfare areas have had to consider the significantly changing requirements posed by operations in the littoraL The fundamental scientific issues involved in developing models relating acoustics to the environment are matched in difficulty by the need for data for their validation and eventual practical use for prediction. In many instances the need is for on-line adaptation of systems to changing circumstances whilst other needs are for the Ionger term planning activities. This book and the attached full-color CD are the proceedings of a conference organ ised by the SACLANT Undersea Research Centre, held at Villa Marigola, Lerici, Italy, on 16-20 September 2002. The fundamental problems associated with environmental 1 variability and sonar were explored at a previous SACLANTCEN conference in 1990. These problems have not gone away but, on the one hand are exaggerated by the move to the littoral and on the other hand, are open to treatrnent in new ways that advances in technology and computer power allow.
Author : Jing Luo
Publisher :
ISBN 13 : 9781369353761
Total Pages : 65 pages
Book Rating : 4.3/5 (537 download)
Download or read book Acoustic Wave Propagation and Intensity Fluctuations in Shallow Water 2006 Experiment written by Jing Luo and published by . This book was released on 2016 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluctuations of low frequency sound propagation in the presence of nonlinear internal waves during the Shallow Water 2006 experiment are analyzed. Acoustic waves and environmental data including on-board ship radar images were collected simultaneously before, during, and after a strong internal solitary wave packet passed through a source-receiver acoustic track. Analysis of the acoustic wave signals shows temporal intensity fluctuations. These fluctuations are affected by the passing internal wave and agrees well with the theory of the horizontal refraction of acoustic wave propagation in shallow water. The intensity focusing and defocusing that occurs in a fixed source-receiver configuration while internal wave packet approaches and passes the acoustic track is addressed in this thesis. ☐ Acoustic ray-mode theory is used to explain the modal evolution of broadband acoustic waves propagating in a shallow water waveguide in the presence of internal waves. Acoustic modal behavior is obtained from the data through modal decomposition algorithms applied to data collected by a vertical line array of hydrophones. ☐ Strong interference patterns are observed in the acoustic data, whose main cause is identified as the horizontal refraction referred to as the horizontal Lloyd mirror effect. To analyze this interference pattern, combined Parabolic Equation model and Vertical-mode horizontal-ray model are utilized. A semi-analytic formula for estimating the horizontal Lloyd mirror effect is developed.
Author : Dale D. Ellis
Publisher : Springer Science & Business Media
ISBN 13 : 9401120781
Total Pages : 399 pages
Book Rating : 4.4/5 (11 download)
Download or read book Ocean Reverberation written by Dale D. Ellis and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past decade there has been a renewed interest in active sonar systems at both low and medium frequencies. More recently this interest has been extended to very high frequencies in shallow water. Reverberation often limits the detection performance of these systems, and there is a need to understand the underlying mechanisms that cause the scattering. With more emphasis being given to reverberation phenomena in the Scientific Program of Work at the SACLANT Undersea Research Centre, it was considered an opportune time to host a meeting, bringing together scientists from NATO countries to foster cross-disciplinary dialogue and generate ideas for new research directions. Consequently the Ocean Reverberation Symposium was held 25-29 May 1992 in La Spezia, Italy. Over 60 presentations were made on a diverse selection of topics, of which ten papers will be published as a SACLANTCEN Conference Proceedings. The papers in this volume are grouped into 8 sections, usually in the same order as presented at the corresponding session of the Symposium: Section 1 - Scattering Mechanisms Section 2 - High Frequency Measurements and Mechanisms Section 3 - Reverberation Modelling Section 4 - ARSRP Mid-Atlantic Ridge Experiment Section 5 - Low Frequency Measurements Section 6 - Volume Scattering Section 7 - Signal Processing Issues Section 8 - Applications Taken together the papers show some emerging trends in the research.
Author : Acoustical Society of America
Publisher :
ISBN 13 :
Total Pages : 1552 pages
Book Rating : 4.F/5 ( download)
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 2007 with total page 1552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. B. Ali
Publisher :
ISBN 13 :
Total Pages : 21 pages
Book Rating : 4.:/5 (227 download)
Download or read book The Role of the Seabed in Low-Frequency Shallow-Water Acoustic Propagation: Examples from Measurements and Modelling written by H. B. Ali and published by . This book was released on 1990 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Except in rather unusual circumstances, interaction with the seafloor is an inevitable accompaniment to the propagation of sound in the sea. In shallow water, especially at very low and low frequencies, the bottom interaction plays a significant, if not deterministic, role in acoustic propagation. From the results of numerous experiments and numerical modelling in recent years, it is evident that one must account for the geoacoustic properties in more than an ad hoc fashion. Some of the relevant research efforts, particularly those from the ongoing research program at the NOARL, are described in this paper. The results of the NOARL measurements in several geographical areas, coupled with numerical modelling, are used to demonstrate the significance of energy partitioning between waterborne and bottom paths, the role of Scholte interface waves, the efficacy and limitations of selected numerical models, and the significance of ambient noise. Keywords: Underwater sound transmission; Underwater acoustics interactions. (edc).
Author : Michael L. Zucker
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)
Download or read book Low Frequency Acoustic Propagation in a Shallow Water Environment in the Presence of Substantial Water Column Blockage written by Michael L. Zucker and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. Akal
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (227 download)
Download or read book Effects of the Sea-Bed on Acoustic Propagation written by T. Akal and published by . This book was released on 1983 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sea-bed is known to be the controlling factor in low-frequency shallow-water acoustics. In lossy sea-beds waterborne sound is attenuated both the compressional-wave attenuation in the bottom and by the coupling of sound into shear waves. The complicated frequency-dependent effect of the sea-bed on propagation has been studied theoretically, and it is found that bottom loss increases with decreasing frequency down to near the cut-off frequency of the ocean waveguide, at which frequency seismic propagation by interface waves on the sea floor becomes more important than acoustic propagation. It is also found that while propagation losses in the water column are strongly dependent on bottom type, a feature such as the optimum frequency of acoustic propagation in the water column is only slightly dependent on sea-bed properties. Broadband propagation data collected in different areas of the Mediterranean Sea and the eastern North Atlantic are shown to support these theoretical findings. (Author).
Author : Jinshan Xu
Publisher :
ISBN 13 :
Total Pages : 191 pages
Book Rating : 4.:/5 (213 download)
Download or read book Effects of Internal Waves on Low Frequency, Long Range, Acoustic Propagation in the Deep Ocean written by Jinshan Xu and published by . This book was released on 2007 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) The observations of mean intensity time-fronts are compared to the deterministic ray, parabolic equation (with/without internal waves) and (one-way coupled) normal mode calculations. It is found the diffraction effect is dominant in the shorter-range transmission. In the longer range, the (internal wave) scattering effect smears the energy in both the spatial and temporal scales and thus has a dominant role in the finale region.
Author : Paul C. Etter
Publisher : CRC Press
ISBN 13 : 1351679724
Total Pages : 639 pages
Book Rating : 4.3/5 (516 download)
Download or read book Underwater Acoustic Modeling and Simulation written by Paul C. Etter and published by CRC Press. This book was released on 2018-04-06 with total page 639 pages. Available in PDF, EPUB and Kindle. Book excerpt: This newest edition adds new material to all chapters, especially in mathematical propagation models and special applications and inverse techniques. It has updated environmental-acoustic data in companion tables and core summary tables with the latest underwater acoustic propagation, noise, reverberation, and sonar performance models. Additionally
Author :
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (946 download)
Download or read book Effect of Shallow Water Internal Waves on Ocean Acoustic Striation Patterns written by and published by . This book was released on 2001 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contour plots of underwater acoustic intensity, mapped in range and frequency, often exhibit striations. It has been claimed that a scalar parameter 'beta', defined in terms of the slope of the striations, is invariant to the details of the acoustic waveguide. In shallow water, the canonical value for beta is one. In the present paper, the waveguide invariant is modeled as a distribution rather than a scalar. The effects of shallow water internal waves on the distribution are studied by numerical simulation. Realizations of time-evolving shallow water internal wave fields are synthesized and acoustic propagation simulated using the parabolic equation method. The waveguide invariant distribution is tracked as the internal wave field evolves in time. Both random background internal waves and more event-like solitary internal waves are considered.
Author : John D. Nixon
Publisher :
ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.:/5 (325 download)
Download or read book Low Frequency Sound Propagation in Shallow Water written by John D. Nixon and published by . This book was released on 1954 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. C. Smith
Publisher :
ISBN 13 :
Total Pages : 23 pages
Book Rating : 4.:/5 (112 download)
Download or read book Alternating Direction Explicit-implicit Computational Method Applied to Low-frequency Underwater Sound Propagation written by M. C. Smith and published by . This book was released on 1968 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new sonar interpretation technique for range determination under conditions in which the usual approximate methods are inadequate. A computer solution of the two-dimensional undamped linearized wave equations is found by using an interlacing explicit-implicit scheme. In the computation, the entire two-dimensional field is found as a function of time. The examples considered involve wave propagation in a homogeneous shallow-water channel where the effect of superposition of discrete spectra produces characteristic modal patterns. The spatial sound pressure fluctuations are represented as plot-density variations along the two-dimensional channel. Examples of discrete propagated modes as well as evanescent modes are presented. The size of the field that can be presented is limited by the size, accuracy, and speed of the computer. The method is programmed in FORTRAN IV for use on the IBM-7040-7044 computer with the S-C 4060 microfilm recorder. (Author).
