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Publications
Sutulo, S. and Guedes Soares, C. (2006), “A Unified Nonlinear Mathematical Model for Simulating Ship Manoeuvring and Seakeeping in Regular Waves”, Proceedings of the International Conference on Marine Simulation and Ship Manoeuvrability (MARSIM´06), 25-30 June, Terschelling, The Netherlands
A new manoeuvring-and-seakeeping 6DOF mathematical model for a slender ship operating in regular waves has been developed. In still water, the model reduces to one of the envisaged semi-empiric or empiric manoeuvring models while in the straight-path motion across the waves it becomes similar to most nonlinear time-domain seakeeping modes with account for the both first-order and second-order excitation. The mathematical model for the waves-related forces combines the strip theory with a separate treatment of the surge motion, it is fully nonlinear with respect to the hydrostatic and FroudeKrylov forces while it uses the linear free-surface boundary condition when dealing with the inertial, damping and diffraction components. All hydrodynamic forces are computed with appropriate viscosity corrections similar to those typically used in the Munk method. Hydrodynamic characteristics of the sections are calculated with the boundary integral equation method with possible account for their instantaneous shape. The memory effects are treated within the lumped-parameters-system approximation through introduction of auxiliary state variables. Some simulations of standard manoeuvres (the straight-path run, turning manoeuvre, zigzag manoeuvre) were carried out for the S-175 hull ship. at various combinations of the parameters defining the oncoming waves and the manoeuvres themselves.
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