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Ship electric propulsion system: Electric power estimation and propeller selection

One of the significant design stages of the ship electric propulsion system is the determination of the electric power and the propeller selection, which must fulfill the exploitation requirements of the ship, it performances and it physical characteristics. This choice is based mainly on the concern of overcoming the ship's total resistance under the projected operating conditions. So, we wrote three algorithms under Matlab that estimates the electric power that must be installed on board. First, the ship resistance is determined. Then, the effective power is estimated and finally the appropriate choice of the propeller is done taking into account the cavitations phenomena. The three algorithms are named in order: the propeller optimization program, the power prediction program and the propeller characteristic curves: calculation and visualization program. The numerical results obtained in this paper confirm our approach.