用空心圆柱体模拟船舶感应磁信号的扩展偶极近似

IF 3 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-14 DOI:10.1016/j.jmmm.2025.173484

Roberto Zivieri, Vincenzo Crupi

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引用次数: 0

摘要

本文提出了一种新的确定船舶静止状态下感应磁信号的解析模型。该分析模型基于迄今为止应用于潜艇的扩展偶极子方法，该方法将舰船视为有限长度的磁偶极子。这种新方法可以与基于磁力计的磁特征测量进行比较。用空心圆柱体模拟船舶，根据扩展偶极子近似解析计算了船舶的感应磁特征，并在外域与点偶极子近似得到的感应磁特征进行了比较，但点偶极子近似在短距离处失效。从解析和数值两方面证明了在浅水中，固定深度的感应磁信号随地理位置的不同而存在差异，这种差异是由局部地磁场引起的。这些结果将有助于以合理的精度识别和探测船舶的磁响应。

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Extended dipole approximation of a ship induced magnetic signature modeled by means of a hollow cylinder

In this paper a novel analytical model to determine the induced magnetic signature of a ship supposed stationary is presented. The analytical model is based on the extended dipole approach which was applied until now to submarines according to which the ship is regarded as a magnetic dipole of finite length. This new approach enables a comparison with measurements of the magnetic signature based on magnetometers. The ship is modeled by means of a hollow circular cylinder and the induced magnetic signature is analytically calculated according to the extended dipole approximation and, in the outer region, is compared to the one obtained by means of the point dipole approximation which fails at short distances. It is proved, both analytically and numerically that, in shallow water, there are differences in the induced magnetic signature at fixed depth which are attributed to the local earth’s magnetic field depending on the geographic location. These results would be beneficial for identifying and detecting with reasonable accuracy a ship in terms of its magnetic response.

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.