ANALYSIS AND MEASUREMENT OF SHIP SHAFT-RATE MAGNETIC FIELD IN AIR | Zendy

Yuhui Sun | Zendy; Chunsheng Lin | Zendy; Wendou Jia | Zendy; Guojun Zhai | Zendy

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ANALYSIS AND MEASUREMENT OF SHIP SHAFT-RATE MAGNETIC FIELD IN AIR

Author(s) -

Yuhui Sun,

Chunsheng Lin,

Wendou Jia,

Guojun Zhai

Publication year - 2016

Publication title -

progress in electromagnetics research m

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.216

H-Index - 31

ISSN - 1937-8726

DOI - 10.2528/pierm16091604

Subject(s) - marine engineering , field (mathematics) , magnetic field , environmental science , acoustics , physics , mechanics , mathematics , engineering , quantum mechanics , pure mathematics

The corrosion and anti-corrosion current of a ship modulated by the shaft can be equivalent to a time-harmonic current. Based on Maxwell’s equations and boundary conditions of electromagnetic field, the Helmholtz equation of magnetic vector potential and the magnetic field expressions of the timeharmonic current in air are deduced. Then, the fast Hankel transform filtering algorithm is applied to solve the equations which contain Bessel function integrals. The theoretic calculation indicates that the magnetic induction intensity and its attenuation rate decrease along with the increase of distance. The three components of magnetic field have different distribution. At last, it is verified that the shaft-rate magnetic field can be observed by the experiments of carbon electrodes and ship model carried in a sea pool.

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