Modeling a ship's ferromagnetic signatures
By: Holmes, John J.
Material type:
BookSeries: Synthesis lectures on computational electromagnetics: #16.Publisher: San Rafael, Calif. (1537 Fourth Street, San Rafael, CA 94901 USA) : Morgan & Claypool Publishers, c2007Edition: 1st ed.Description: 1 electronic text (vii, 75 p. : ill. (some col.)) : digital file.ISBN: 159829251X (electronic bk.); 9781598292510 (electronic bk.); 1598292501 (pbk.); 9781598292503 (pbk.).Uniform titles: Synthesis digital library of engineering and computer science. Subject(s): Boundary element methods | Ferromagnetism -- Mathematical models | Finite element method | Magnetism of ships -- Mathematical models | Magnetic boundary-element models | Magnetic finite-element models | Magnetic scale models | Magnetic ship models | Model verification and validation | Multi-pole expansion | Naval vessel empirical models | Prolate spheroidal coordinates | Spherical coordinatesDDC classification: 620.00151535 Online resources: Abstract with links to resource | Abstract with links to full text Also available in print.| Item type | Current location | Call number | Status | Date due | Barcode | Item holds |
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E books
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PK Kelkar Library, IIT Kanpur | Available | EBKE033 |
Mode of access: World Wide Web.
System requirements: Adobe Acrobat Reader.
Part of: Synthesis digital library of engineering and computer science.
Series from website.
Includes bibliographical references.
1. Introduction -- Reference -- 2. Basic equations -- 2.1 Basic equations of electromagnetics -- 2.2 Coordinate systems -- 2.3 Prolate spheroidal coordinate system -- 2.4 Solution to Laplace's and Poisson's equation in prolate spheroidal coordinates -- References -- 3. First-principal models -- 3.1 Spherical model of a vessel's hull -- 3.2 Prolate spheroidal model of a vessel's hull -- 3.3 Dipole moments and their units -- 3.4 Mathematical models of a degaussing coil -- 3.5 Numerical models -- 3.6 Ferromagnetic physical scale models -- References -- 4. Semiempirical models -- 4.1 Forward models -- 4.2 Inverse models -- References -- 5. Summary -- References -- Appendix I. References -- Appendix II. Author biography.
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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.
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