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Publications
Santos, T.A., Fonseca, N. and Guedes Soares, C. (1997), “Study of the Non-Linear Roll Motions of Fishing Vessels in Regular Seas”, Proceedings of the 6th International Conference on Stability on Ships and Ocean Vehicles (STABS’97), Bogdanov, P. A. (Ed.), Varna, Vol. II, pp. 163-177
The nonlinear rolling motion of ships in regular seas is studied. The nonlinear differential equation is analyzed using the phase plane analysis and the Runge-Kutta fourth-order method of numerical solution. The damping moment coefficient is determined by the method of component analysis, leading to an equivalent linear damping coefficient. These methods were implemented in a computer program, which was used to analyze the behavior of three fishing vessels and one fishery research vessel.
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