Abstract
The measurement of ship resistance is important in naval architecture and marine hydrodynamics research. The method of predicting ship resistance from scaled model tests has been used for over 100 years but the results suffer from “scale effect”. This paper presents a new method of “measuring” the resistance of full size ships by using a system identification technique. Extended Kalman Filtering is used for estimating intermediate coefficients in the ship's surge motion equation, then the ship resistance coefficient is derived from the identified results. This method only requires a simple sea trial during a ship's regular voyage. The ship resistance coefficient as well as the wake fraction and the thrust deduction factor were obtained with excellent accuracy. The success of this method should impact the design of ship hulls and propellers and also research in marine hydrodynamics.
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