Modeling of degaussing coils effects in ships by the method of reduced scalar potential jump

Dorze, F. Le; Bongiraud, Jean-Paul; Coulomb, Jean‐Louis; Labie, Patrice; Brunotte, X.

doi:10.1109/20.717570

Cited by 19 publications

(24 citation statements)

References 3 publications

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“…2(a)). Notice that this underwater surface contains many geometric details, like the keel and turbines, that normally will be included for the accurate numerical approximations of electromagnetic radiation [21][22][23]. For the purpose of this paper (and for many ill-posed problems) it is common practice to use a simplified model that can account for the basic mechanisms of the electromagnetic radiation.…”

Section: Numerical Experimentsmentioning

confidence: 99%

Underwater Electromagnetic Holography Imaging Techniques for Shallow Water Mediums

Valdivia¹,

Williams²,

Alqadah³

2017

PIER B

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Abstract-We propose an approach to characterize the AC underwater radiation produced by a ship over a shallow water medium using dipole sources distributed over an interior surface to the ship. The proposed approach relies on the accurate and efficient representation of dipole sources over the shallow water medium that characterizes the behavior of the electric or magnetic field. The approach is reduced to the solution of the resultant matrix system from the dipole representation. These systems are ill-posed, i.e., if the matrix systems are not solved by special regularization methods, the resultant solution will amplify the measurement noise. The regularization method applied is the least squares QR iterations combined with a new stopping rule that uses a numerical estimate of the measurement noise. Numerically generated data is used to study the validity of the different dipole representations. Finally, we validate our methodology using magnetic measurements that result from degaussing coils of a mid-size vessel.

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Section: Numerical Experimentsmentioning

confidence: 99%

Underwater Electromagnetic Holography Imaging Techniques for Shallow Water Mediums

Valdivia¹,

Williams²,

Alqadah³

2017

PIER B

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“…This reversible permeability corresponds to small and linear variations of the magnetization when the material underlies such low fields. Considering that (3) and combining it with (1) and (2), we get the expression of the induced magnetization (4) where is the field created by the whole magnetized shell and can be expressed with an integral equation. Combining this equation with (4), we obtain the classical integral volume equation for magnetostatic linear problem [8].…”

Section: Integral Volume Equation Formulationmentioning

confidence: 99%

“…Until now, the most used numerical method was the finite element method. Many papers have already been published about the computation of the magnetization [1], [2] and the coils effects [3].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, if we consider that a standard ship owns tens of coils, the modelling becomes quickly too memory consuming. A solution proposed in [3] is to complete the finite element method with to an analytical behavior of the local effect. However this solution remains difficult to generalize and suffers of inaccuracies for real complex geometries.…”

Section: Introductionmentioning

confidence: 99%

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Ships Magnetic Anomaly Computation With Integral Equation and Fast Multipole Method

et al. 2011

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This paper presents a coupling between integral volume equation method (IVEM) and a fast multipole algorithm (FMM) in order to model ships magnetic anomaly. complex geometries of real vessels associated with dense meshes can be treated in order to compute the magnetic field created by induced magnetization of the hull and coils degaussing systems. Our algorithm has been validated with measurements made on a real submarine mock-up.

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“…One option is to invest in complex degaussing systems [1,2] in order to avoid costly deperming processes. However, it is generally assumed that deperming cycles during the life-cycle of a vessel cannot be completely avoided.…”

Section: Introductionmentioning

confidence: 99%

Process for Compensating Local Magnetic Perturbations on Ferromagnetic Surfaces

Madrid¹,

Melcón²

2012

JEMAA

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This paper addresses a practical application for the compensation of a local magnetic perturbation in a ship in the near field region. The process will avoid expensive deperming techniques usually applied to ships to treat magnetic anomalies. The technique includes a new system to construct magnetic maps on flat ferromagnetic surfaces. Once the magnetic maps are obtained, a new system is proposed to evaluate and locate local magnetic perturbations. Once the local perturbations are located, they are compensated by local degaussing coils. The new technique has been applied to the detection of local magnetic perturbations in four naval platforms. Two of them presented important magnetic anomalies, and were successfully detected and corrected by applying the new technique, thus showing its practical value.

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Modeling of degaussing coils effects in ships by the method of reduced scalar potential jump

Cited by 19 publications

References 3 publications

Underwater Electromagnetic Holography Imaging Techniques for Shallow Water Mediums

Underwater Electromagnetic Holography Imaging Techniques for Shallow Water Mediums

Ships Magnetic Anomaly Computation With Integral Equation and Fast Multipole Method

Process for Compensating Local Magnetic Perturbations on Ferromagnetic Surfaces

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