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Near-Field Ship Wake Signature Modeling and Simulation

1994
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Release : 1994
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Book Synopsis Near-Field Ship Wake Signature Modeling and Simulation by : D. Lyzenga

Download or read book Near-Field Ship Wake Signature Modeling and Simulation written by D. Lyzenga. This book was released on 1994. Available in PDF, EPUB and Kindle. Book excerpt: A frequently observed characteristic of Synthetic Aperture Radar (SAR) imagery of moving ships is an area of increased backscatter immediately behind the ship extending approximately one ship length. The region causing these signatures has been termed the near-field disturbed water (NFDW) region of the ship. In this report a simple prediction model for these signatures is presented. This model utilizes a Fourier transform solution for the Kelvin wake along with a numerical procedure for calculating the hull pressure distribution. The model appears to predict the breaking regions more or less correctly for ship hulls having a rectangular stern, but over predicts the extent of the breaking regions for non-rectangular stern shapes. This limitation is apparently due to the fact that energy dissipation due to wave breaking has not been included. Outputs from the NFDW model are used to simulate a SAR image of the NFDW region and encouraging agreement between the appearance of the simulated and actual SAR images is found. The dependence of the NFDW with ship speed is in agreement with observations.

Twenty-First Symposium on Naval Hydrodynamics

1997-09-11 Science
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Release : 1997-09-11
Genre : Science
Kind : eBook
Book Rating : 791/5 ( reviews)

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Book Synopsis Twenty-First Symposium on Naval Hydrodynamics by : National Research Council

Download or read book Twenty-First Symposium on Naval Hydrodynamics written by National Research Council. This book was released on 1997-09-11. Available in PDF, EPUB and Kindle. Book excerpt:

Twenty-Third Symposium on Naval Hydrodynamics

2002-01-01 Science
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Release : 2002-01-01
Genre : Science
Kind : eBook
Book Rating : 671/5 ( reviews)

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Book Synopsis Twenty-Third Symposium on Naval Hydrodynamics by : National Research Council

Download or read book Twenty-Third Symposium on Naval Hydrodynamics written by National Research Council. This book was released on 2002-01-01. Available in PDF, EPUB and Kindle. Book excerpt: "Vive la Revolution!" was the theme of the Twenty-Third Symposium on Naval Hydrodynamics held in Val de Reuil, France, from September 17-22, 2000 as more than 140 experts in ship design, construction, and operation came together to exchange naval research developments. The forum encouraged both formal and informal discussion of presented papers, and the occasion provides an opportunity for direct communication between international peers. This book includes sixty-three papers presented at the symposium which was organized jointly by the Office of Naval Research, the National Research Council (Naval Studies Board), and the Bassin d'Essais des Carènes. This book includes the ten topical areas discussed at the symposium: wave-induced motions and loads, hydrodynamics in ship design, propulsor hydrodynamics and hydroacoustics, CFD validation, viscous ship hydrodynamics, cavitation and bubbly flow, wave hydrodynamics, wake dynamics, shallow water hydrodynamics, and fluid dynamics in the naval context.

Modeling a Ship's Ferromagnetic Signatures

2007 Boundary element methods
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Release : 2007
Genre : Boundary element methods
Kind : eBook
Book Rating : 501/5 ( reviews)

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Book Synopsis Modeling a Ship's Ferromagnetic Signatures by : John J. Holmes

Download or read book Modeling a Ship's Ferromagnetic Signatures written by John J. Holmes. This book was released on 2007. Available in PDF, EPUB and Kindle. Book excerpt: Ferromagnetic models of ships and submarines that predict or reproduce their magnetic signatures have found applications in the development of both offensive and defensive military systems from World War II to the present. The mathematical basis of generalized coordinate systems will be presented and demonstrated with example applications to analytic spherical and prolate spheroidal magnetic ship models. In addition, the advantages and pitfalls of using complex finite-element- and boundary-element numerical techniques to predict high-order near-field ship signatures will be discussed, followed by a short description of the design and testing of complementary physical scale models. Extrapolation of measured magnetic signatures from testing environments to threat areas using semi-empirical math models will be presented, along with an explanation of their inherent instabilities and methods for regularizing them. These magnetic ship signature modeling techniques are used today in designing optimized signature reduction systems that have a minimum impact on ships and their systems. The discussion will be closed with an important discussion of the verification and validation of magnetic models of surface ships and submarines.

Marine Propulsors

2018-10-10 Technology & Engineering
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Release : 2018-10-10
Genre : Technology & Engineering
Kind : eBook
Book Rating : 029/5 ( reviews)

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Book Synopsis Marine Propulsors by : Sverre Steen

Download or read book Marine Propulsors written by Sverre Steen. This book was released on 2018-10-10. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Marine Propulsors" that was published in JMSE

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