Evaluation of a numerical model for ship magnetic signature induced by an external field

Abstract

In order to assess the ship magnetism induced by the Earth's magnetic field, a virtual ship was built, which was further analyzed in the Ansoft Maxwell environment. The virtual ship model's main dimensions and material characteristics were similar to the ones of the actual ship. The ship model was considered a metallic shell of 12 mm width. The analysis studied the impact on ship magnetization of an external magnetic field oriented vertically and afterwards horizontally. Finally, there was determined the magnetization induced by the geomagnetic field, consisting of the previously considered components. The external magnetic field values were chosen from the main geomagnetic field reference model (IGRF) for the area near the Romanian coast of the Black Sea. Simulation results were compared to a set of measurements performed on the ship itself, and differences between simulated and measured values were discussed.

Research on the applicability of regularization methods in ship magnetic field modeling based on magnetic dipole arrays

“…In the fields of aeromagnetic exploration, submarine magnetic exploration network, port defense, etc., it is of great significance to achieve accurate modeling of the ship's magnetic field, but it is also extremely challenging [1][2][3][4] . The equivalent source method is a simple numerical calculation method for the reconstruction of the ship's magnetic field.…”