Simulation and Analysis of the Propagated Electromagnetic Field from a Multi-Source Environment


The goal of this project is to simulate the propagated electromagnetic field from the ship power systems and compare them to the actual measured fields. The active elements of the ship power system are generators, propulsion’s, and the cables. The current of the active elements together with their current loop is assumed to act as an antenna which manly produce the magnetic and electric fields. The nominal value of currents in the active part is considered. Moreover, an attention is given to the magnetic and electric properties of the elements inside the model.

In general, there are lots of uncertainties in the modeling of the current loops inside the ship, the direction of the current loops, the value of the current inside the current loops, the loop modeling of the electrical machines, the number of the active turns inside the coils of the machine, and the loops modeling of the power cables. In this work, at first the direction and the proper current loops for the separate modeling of the active parts inside the ships are done. A basic model, model 1116 is set and it is assumed as the reference model and after that the other models are run separately. Furthermore the detail of the materials used inside the model is collected. Several cases are studied in those different arrangements of the propulsion’s, generators, and DG coils are participated. The DG coil under DC and AC current is simulated. The propulsion’s together and separately are modeled.

Adaptive Revised mesh for faster solving and higher accuracy in simulation of Ship

The magnetic flux density in X, Y, and Z direction as well as the normal field of the one loop model are illustrated in below . As it is seen from this figures the magnetic flux density in X and Y and Z directions are closely followed the measured values both in amplitude and in the variations.

Simulated and measured magnetic flux density


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