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Publications
Sutulo, S. and Guedes Soares, C. (2005), “Simulation of a Fast Catamaran’s Manoeuvring Motion Based on a 6DOF Regression Model”, Proceedings of International Conference on Fast Sea Transportation (FAST’05), 27–30 June, St. Petersburg, Russia
Some observations of the manoeuvring motion of fast displacement catamarans indicated that dynamic changes in the ship’s attitude in vertical planes (sinkage, trim and heel) observed during high-speed manoeuvring can have effect on the horizontal plane hydrodynamic forces and on the dynamic properties of these vessels. However, merely all catamaran manoeuvring simulations carried out so far were based on simplified 3DOF mathematical models. In the present study, used were regression models for all 6 components of the hull forces with account for the influence of the attitude alteration effects previously developed on the basis of Computerized Planar Motion Carriage captive-model tests. Basing on these regressions, a relatively complete 6DOF manoeuvring mathematical model was developed for a particular river-going catamaran equipped with steered water-jets. Certain components of the hydrodynamic force, which could not be determined from the captive-model tests, were estimated by means of the slender-body theory, the cross-flow drag concept and other semi-empiric approaches. Standard manoeuvres were simulated using both the 6DOF and 3DOF mathematical models.
The results were compared with the available full-scale data and this comparison indicated that the 6DOF modelling becomes really more adequate at higher speed.
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