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Publications
Fonseca, N., Guedes Soares, C. and Marón, A. (2005), “Experimental and numerical hydrodynamic coefficients of a containership in large amplitude heaving and pitching”, Maritime Transportation and Exploitation of Ocean and Coastal Resources, 2005, Guedes Soares, C., Garbatov, Y. and Fonseca, N. (Eds.), Traylor & Francis, London-UK, Vol. 1, pp. 147-156
The present paper contributes with new experimental data of the added masses and damping coefficients for a containership in heaving and pitching and with comparisons with results from a numerical model. A model of a modern containership was constructed in Fiber Reinforced Plastic (FRP) to a scale of 1:55 resulting in a length between perpendiculars of 3.55m. The model was made up of 4 segments connected by a backbone in order to measure the loads at the positions of the cuts and in this way deduct the hydrodynamic coefficients of each of the segments. The experimental work included forced motions tests in calm. The objective was to obtain the heave and pitch added masses and damping coefficients for different speeds and also for different amplitudes of the forced motions. One important aspect was to assess the level of nonlinear effects with the amplitude of the forced motions. A large set of hydrodynamic coefficients was obtained, both for the complete hull and also for each of the four segments, which gives a discrete distribution of the hydrodynamic coefficients along the ship length. Finally the experimental data is systematically compared with the results from a seakeeping program based on a strip theory and conclusions are obtained with respect to the limits of application of the theoretical model.
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