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Identification de sources magnétiques : robustesse et optimisation des mesures.
Application à la reconstruction de l'aimantation des navires

Abstract : The closed loop degaussing system aims at protecting ships from their magnetic risk in real time. Steel which is the main ship component of ships is magnetized by Earth magnetic field. This magnetization creates a local anomaly of this field. This anomaly could cause ship detection or destruction. An algorithm predicting anomaly of a simple ship mock-up from its physical description and onboard measurements has been developed during a previous work. The aim of our work is to improve this algorithm to predict a real ship anomaly. The first part of this document presents analytical integration which ameliorates calculus precision and reduces the minimal distance between the ship hull and sensors. The second part is dedicated to magnetic gradient study. This quantity, more local than induction, is useful to take into account local anomalies perturbing induction measurements (e.g. internal masses). An experimental validation underlines possibilities of gradient measurements. The third part deals with the magnetic scalar potential which is more global than gradient and induction. A numerical study affirmed its interest for our purposes. The last part of this document deals with a combined optimization and robustness study aiming at defining a method to place sensors for a real ship.
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https://tel.archives-ouvertes.fr/tel-00011328
Contributor : Sébastien Guerin <>
Submitted on : Monday, January 9, 2006 - 5:45:33 PM
Last modification on : Friday, November 6, 2020 - 4:39:23 AM
Long-term archiving on: : Saturday, April 3, 2010 - 9:01:59 PM

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  • HAL Id : tel-00011328, version 1

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Sébastien Guerin. Identification de sources magnétiques : robustesse et optimisation des mesures.
Application à la reconstruction de l'aimantation des navires. Matière Condensée [cond-mat]. Institut National Polytechnique de Grenoble - INPG, 2005. Français. ⟨tel-00011328⟩

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