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An approximate power prediction method
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1982
Year
EngineeringShip ManeuveringPower Optimization (Eda)Marine EngineeringStructural EngineeringSystems EngineeringModeling And SimulationPrediction FormulaePower PredictionApproximation TheoryPredictive AnalyticsShip ResistanceComputer SciencePropulsionPower ConsumptionEnergy PredictionRequired Propulsive PowerStrength Of ShipSmart GridOcean EngineeringShip DesignSeakeeping And ControlStructural Mechanics
A statistical method for estimating required propulsive power at the initial design stage of a ship was previously presented, but its application is limited to hull forms resembling the average ship defined by the main dimensions and form coefficients used in the method. The study aims to extend the original power prediction method by adjusting its numerical model to better predict propulsive power for unconventional hulls, specifically high‑block ships with low length‑to‑beam ratios and slender naval ships with complex appendage arrangements and immersed transom sterns. The method was derived from a regression analysis of random model experiments and full‑scale data from the Netherlands Ship Model Basin, and the extension involved adjusting the numerical prediction model using test data from specific cases. The adaptation produced a set of prediction formulas with a wider range of application, though the modifications remain tentative due to the limited number of experiments.
In an earlier publication, a statistical method was presented for the determination of the required propulsive power at the initial design stage of a ship. This method was developed through a regression analysis of random model experiments and full-scale data, available at the Netherlands Ship Model Basin. Because the accuracy of the method was reported to he insufficient when unconventional combinations of main parameters were used, an attempt is made in the present article to extend the method by adjusting the original numerical prediction model to test data obtained in some specific cases. This adaptation of the method has resulted in a set of prediction formulae with a wider range of application. Nevertheless, it is pointed out that the given modifications have a tentative character only, because the adjustments are based on a small number of experiments. In any case, the application is limited to hull forms resembling the average ship described by the main dimensions and form coefficients used in the method. The extension of the method was focused on improving the power prediction for high-block ships with low L/B ratios, and for slender naval ships with complex appendage arrangements and immersed transom sterns.