Dr Andres Peratta presented some recent conceptual work on the application of simulation modelling to predict the corrosion related potentials and electric and magnetic fields on and surrounding naval vessels at the International Conference On Marine Electromagnetics (MARELEC) in Philadelphia, USA. Modelling is used to predict the corrosion related potentials on the vessel itself, and the electric and magnetic fields surrounding the vessel. For naval vessels, modelling can be exploited to not only assess the performance of cathodic protection systems on the vessel (ICCP and sacrificial) but also the corrosion related magnetic fields as they make a significant contribution to the vessel signature.
The paper evaluated the magnetic field caused by return-path current flowing in the hull of a vessel, and compared the electromagnetic fields calculated using different assumptions regarding how the cathodic protection currents flow. The cases assessed included flow along an equivalent horizontal wire, and flow through the vessel skin to selected collection points at which cables return current to the power supply. The effects of different layouts of collection points were investigated to determine the sensitivity of the magnetic field to the layout.
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