<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Eddy current magnetic signature is, together with magnetization of ferromagnetic hull, mechanisms and devices on board, corrosion related and stray field sources one of the main sources of ship’s magnetic signature. Due to roll, pitch and yaw of the ship in external magnetic field, eddy currents are induced in conducting materials on board ship, mainly in conducting hull. Flow of those currents is a source of magnetic field around a ship. Principal eddy current component is related to roll movement as it depends on rate of change of external field which is the highest for roll. Induced currents have both in-phase and quadrature components. Magnitude of the eddy current magnetic field can have significant effect on total magnetic field signature after degaussing for ships such as mine sweepers and mine hunters. Paper presents calculations and simulations as well as measurements of model and physical scale model made of low magnetic steel performed in Maritime Technology Center. Contribution of eddy current magnetic field in total field in low roll frequencies has been estimated.</p></abstract>

Eddy current magnetic signature is, together with magnetization of ferromagnetic hull, mechanisms and devices on board, corrosion related and stray field sources one of the main sources of ship’s magnetic signature. Due to roll, pitch and yaw of the ship in external magnetic field, eddy currents are induced in conducting materials on board ship, mainly in conducting hull. Flow of those currents is a source of magnetic field around a ship. Principal eddy current component is related to roll movement as it depends on rate of change of external field which is the highest for roll. Induced currents have both in-phase and quadrature components. Magnitude of the eddy current magnetic field can have significant effect on total magnetic field signature after degaussing for ships such as mine sweepers and mine hunters. Paper presents calculations and simulations as well as measurements of model and physical scale model made of low magnetic steel performed in Maritime Technology Center. Contribution of eddy current magnetic field in total field in low roll frequencies has been estimated.

Simulations and Measurements of Eddy Current Magnetic Signatures

Maritime Technical Journal

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Simulations and Measurements of Eddy Current Magnetic Signatures"}

Eddy current magnetic signature is, together with magnetization of ferromagnetic hull, mechanisms and devices on board, corrosion related and stray field...

Simulations and Measurements of Eddy Current Magnetic Signatures

Published Online: Feb 01, 2019

Page range: 77 - 102

Received: May 28, 2018

Accepted: Dec 07, 2018

DOI: https://doi.org/10.2478/sjpna-2018-0028

Keywords
ship’s magnetic signature, eddy currents, degaussing system (DG), physical scale model

© 2018 Paweł Polański et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Simulations and Measurements of Eddy Current Magnetic Signatures

Published Online: Feb 01, 2019

Page range: 77 - 102

Received: May 28, 2018

Accepted: Dec 07, 2018

DOI: https://doi.org/10.2478/sjpna-2018-0028

Keywordsship’s magnetic signature, eddy currents, degaussing system (DG), physical scale model

© 2018 Paweł Polański et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
ship’s magnetic signature, eddy currents, degaussing system (DG), physical scale model