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Publications
Fonseca, N. and Guedes Soares, C. (2006), “Effect of Sway and Yaw Coupling on the Prediction of Resonant Roll Motions”, Proceedings of the 9th International Conference on Stability of Ships and Ocean Vehicles (STAB´06), 25-29 September, Rio de Janeiro, Brazil
Large roll motions are dominated by nonlinear effects arising from different sources, which results into a highly complex problem to calculate numerically. For this reason many researchers chose to uncouple the roll from the other modes of motion, while representing as accurately as possible the nonlinear effects on the restoring and damping terms. This paper investigates the consequences of neglecting, or of simplifying, the linear coupling of roll with the horizontal motions. The coupling is related to inertial and hydrodynamic effects that are felt when the line of action of the related forces in sway and yaw do not pass through the origin of the coordinate system.
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