Masking of ferromagnetic ellipsoidal shell in Earth’s magnetic field

• Autorzy: Jakubiuk K. , Wołoszyn M. , Zimny P.
• Języki publikacji: EN

Abstrakty

EN

A ferromagnetic object, located in the Earth’s magnetic field, changes the distribution of that field. By measuring such disturbances it is possible to detect the object and destroy it. To conceal the object, a special winding is placed inside its ferromagnetic shell, which function is to eliminate the disturbances in the distribution of the Earth’s magnetic field. A thin walled ellipsoidal shell made of ferromagnetic material are examined as the object model. Coils are placed inside the shell and their function is to generate a magnetic field, which eliminates the effect the shell makes on the distribution of the Earth’s magnetic field in the surrounding area. Such a procedure is called magnetic masking and the winding used for this purpose is called the masking winding. The possibility of building the masking windings for the ferromagnetic ellipsoidal shell, situated in a magnetic field transverse in relation to its major axis, is also examined. Masking of a thin-walled ellipsoidal ferromagnetic object located in the longitudinal magnetic field is described in the article [1]. Investigating the possibility of masking of objects in a transverse magnetic field presented in this article will allow for a comprehensive assessment of a possibility of masking thin walled ferromagnetic objects of elongated ellipsoidal shape. The solution of Maxwell’s equations, which describe the magnetic field distribution caused by the ferromagnetic shell presence in the Earth’s magnetic field, are applied. Furthermore, the ability of selecting coils, which fully eliminate the perturbations of the magnetic field outside the shell are proven.

Słowa kluczowe

EN

mathematical models of magnetic field; magnetization of ferromagnetic object; masking of ferromagnetic object; windings for demagnetization of the ship

• Wydawca: Wydawnictwo Politechniki Poznańskiej
• Czasopismo: Computer Applications in Electrical Engineering
• Rocznik: 2013
• Tom: Vol. 11
• Strony: 92--99
• Opis fizyczny: Bibliogr. 3 poz., rys.

Twórcy

autor

Jakubiuk K.

• Gdańsk University of Technology, 80-233 Gdańsk, Narutowicza Street 11/12

autor

Wołoszyn M.

• Gdańsk University of Technology, 80-233 Gdańsk, Narutowicza Street 11/12

autor

Zimny P.

• Gdańsk University of Technology, 80-233 Gdańsk, Narutowicza Street 11/12

Bibliografia

• [1] Jakubiuk K., Zimny P., Wołoszyn M.: Maskowanie obiektu w kształcie elipsoidy w ziemskim polu magnetycznym. International Conference on Fundamentals of Electrotechnics and Circuit Theory. Gliwice-Ustroń, pp. 25-26, 2012.
• [2] Lebiediew N.N.: Funkcje specjalne i ich zastosowania. PWN Warszawa 1957.
• [3] Hobson E.W.: The Theory of Spherical and Ellipsoidal Harmonics. Cambridge at the University Press 1931.