Fundamentals of Ocean Acoustics

Brekhovskikh, Leonid M.; Lysanov, Yury P.; Beyer, Robert T.

doi:10.1007/978-3-662-07328-5

Cited by 591 publications

(422 citation statements)

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“…KRAKEN normal modes code in the Acoustic Toolbox is used in this thesis to model the sound field transmitted from the point source. KRAKEN normal mode model is robust, accurate, and efficient [9,10]. A version of KRAKEN with a MEX wrapper is used so that it can easily be called from Matlab software, and the Python Scripts source code is used for reading/writing input/output the sound field calculation results.…”

Section: Normal Modes Methodsmentioning

confidence: 99%

Numerical simulation of underwater acoustical field with directional sources based on the normal modes model

Wang¹,

Wang²,

Jia³

2017

MATEC Web Conf.

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Abstract. In this paper, beamforming and normal modes method are combined to calculate the underwater acoustical field. Firstly, beamforming technology is used to form directional sources by controlling the phase and relative amplitude. Secondly, considering the ocean speed, surface and bottom boundary, the point source sound field is calculated based on the normal modes model. Then underwater acoustical field with directional sources is achieved by adding all point source field. Taken the 11 elements vertical linear array as an example, the special directional source is formed by chebyshev amplitude weighting, and then underwater acoustical field is calculated in the Munk profile of different grazing angles. The results indicate that beam grazing angle is very essential to its sound field, and changing the grazing angle can enhance the sound intensity of the shadow zone correspondingly.

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Section: Normal Modes Methodsmentioning

confidence: 99%

Numerical simulation of underwater acoustical field with directional sources based on the normal modes model

Wang¹,

Wang²,

Jia³

2017

MATEC Web Conf.

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“…The absorption is set α a = 106.5 dB/km corresponding to k w = 0.0123 m −1 . This value is obtained from [9] by setting the depth equal to 10 meters, salinity to 30 ppt, and temperature to 15 • C. At normal incidence, a conservative estimate of the backscattering strength is BS ≈ -5 dB. The expected acoustic pressure level on a single receiver ceramic is based Eq.…”

Section: Proceedings Of the 11th European Conference On Underwater Acmentioning

confidence: 99%

Towards a fully calibrated multibeam echosounder

Wendelboe¹,

Dahl²,

Maillard³

et al. 2012

Proceedings of Meetings on Acoustics

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“…From remote sensing (Tsang et al 1985) to underwater acoustics (Brekhovskikh & Lysanov 1982), the ability to simulate, in a robust and accurate way, the fields generated by such structures is of crucial importance to researchers from many disciplines. This contribution focuses upon the rapid and highly accurate numerical approximation of solutions of Helmholtz equations coupled across irregular periodic interfaces meant to model acoustic waves incident upon a multi-layered medium.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional acoustic scattering by layered media: a novel surface formulation with operator expansions implementation

Nicholls

2011

Proc. R. Soc. A.

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The scattering of acoustic waves by irregular structures plays an important role in a wide range of problems of scientific and technological interest. This contribution focuses on the rapid and highly accurate numerical approximation of solutions of Helmholtz equations coupled across irregular periodic interfaces meant to model acoustic waves incident upon a multi-layered medium. We describe not only a novel surface formulation for the problem in terms of boundary integral operators (Dirichlet-Neumann operators), but also a Boundary Perturbation methodology (the Method of Operator Expansions) for its numerical simulation. The method requires only the discretization of the layer interfaces (so that the number of unknowns is an order of magnitude smaller than volumetric approaches), while it avoids not only the need for specialized quadrature rules but also the dense linear systems characteristic of Boundary Integral/Element Methods. The approach is a generalization to multiple layers of Malcolm & Nicholls' Operator Expansions algorithm for dielectric structures with two layers. As with this precursor, this approach is efficient and spectrally accurate.

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Fundamentals of Ocean Acoustics

Cited by 591 publications

References 0 publications

Numerical simulation of underwater acoustical field with directional sources based on the normal modes model

Numerical simulation of underwater acoustical field with directional sources based on the normal modes model

Towards a fully calibrated multibeam echosounder

Three-dimensional acoustic scattering by layered media: a novel surface formulation with operator expansions implementation

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