Abstract
Abstract The selection of powering margins is a paramount subject in ship design to assure the satisfactory speed performance in ship operation. In this work, the influence of wind and wave on ship resistance is calculated using the methods recommended by ITTC [16]. The influence of fouling on resistance is predicted by the method of Granville [18,19], while the influence of fouling on propeller performance is predicted by the method discussed at ITTC [20]. The seaway conditions are derived by onboard monitored data while the hull and propeller are assumed to be in line with practical observations. All the implemented methods have strong background in theoretical and experimental studies, and are easy-to-use and fast in execution. A case study is presented to demonstrate the methodology. This work is expected to support ship owners, operators, and designers in determining the powering margins in the frame of preliminary ship design.
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