Ship Cathodic Protection Numerical Simulation Of Electromagnetic Effects

Cathodic protection method has been being widely used to extend the life of the ship body so as to realize the normal function of a ship hull. The protection current around the ship hull resulted from the cathodic protection system would surely bring the related magnetic field (the corrosion related magnetic field), and which is generally difficult to be measured. The study shows that the corrosion related magnetic field is the main component in the far magnetic field. The controlling of the corrosion related magnetic field can make the vessels safer and the ships more stabilized. It also have a very important meaning in conciding with the trend of ship intelligentize.In the research processes, after reading a lot of literature review, grasp the basic principle of the related magnetism, and then a study on the corrosion related magnetic field problem was carried out based on the basic theory. The boundary integral equation for the corrosion related magnetic field was educed under certain conditions by using the second kind of Fredholm integral equation, and a calculating program for the numerical analysis of the corrosion magnetic field was developed. The numerical analysis method and the calculating program was confirmed by comparing with the ANSYS software. It is expected that the research work carried out in this thesis would provide an effective means for understanding the corrosion related magnetic field resulted from the cathodic protection system around a ship hull, and then a design for the cathodic protection system being optimal for the corrosion related magnetic field would become possible.This paper study the numerical simulated calculation method and calculate the three-dimension corrosion related magnetic field by BEM firstly. The study consider the magnetic field caused not only by the current but also by the object that can be magnetized and achieve a primary success.