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Vol. 186, Issue 3, March 2015, pp. 161-167

 

Bullet

 

Modeling and Measurements of Alternating Magnetic Signatures of Ships
 

1 Zhiqiang Wu, 1* Xinhua Zhu, 2 Bin Li

1 School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
2 School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, 710072, China
1* Tel.: 18936876770 fax: 025-84303258

* E-mail: zhuxinhua@njust.edu.cn

 

Received: 27 February 2015 /Accepted: 30 March 2015 /Published: 31 March 2015

Digital Sensors and Sensor Sysstems

 

Abstract: The alternating electric and magnetic fields are new contributors to the global electromagnetic silencing of ships. Thus, modeling and measurements of alternating magnetic signatures should be a research priority in maritime engineering. In this paper, an alternating horizontal electric dipole is adopted to model the electromagnetic fields related with corrosion. Formulas for alternating magnetic fields generated in shallow sea by horizontal electric dipole are derived based on an air-sea-seabed three-layered model and a numerical computer is also applied. In addition, the alternating magnetic fields of a ship are measured using a tri-axis fluxgate magnetometer fixed in a swaying platform. The characteristics of these fields are analyzed. Finally, the equivalent dipole moment of the trial ship is predicted by contrasting the model results and the observed data.

 

Keywords: Electromagnetic signatures, Alternating magnetic field (AM), Horizontal electric dipole (HED), Fluxgate magnetometer, Swaying platform.

 

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