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Publicações
Ribeiro e Silva, S., Santos, T.A. e Guedes Soares, C. (2003), “Time Domain Simulations of a Coupled Parametrically Excited Roll Response in Regular and Irregular Head Seas”, Proceedings of the 8th International Conference on the Stability of Ships and Ocean Vehicles (STAB´03), 15-19 Setembro, Madrid, Espanha
In this study dynamic stability problems in head seas are investigated with the use of a timedomain, non-linear numerical model of ship's motions in 5 degrees-of-freedom (sway, heave, roll, pitch, and yaw). The results presented in this paper have shown that the ship can be subjected to the wave-induced parametric resonance in regular and also in irregular waves. A quasi-static approach is adopted to determine the non-linear restoring coefficients in heave, roll, and pitch motions in waves, in which calculations are made using a pressure integration technique over the instantaneous submerged hull. Dynamic and hydrodynamic effects in waves for a given encounter frequency are included in the 5 degrees-of-freedom responses calculations, which are based on the potential flow strip theory. Comparisons between computed values and applicable experimental results demonstrated the usefulness of the technique proposed.
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