The Influence of Roll Radius of Gyration Including the Effect of Inertia of Fluids on Motion Predictions

摘要

Computer based ship motion predictions using strip theory and similar methodologies have become routine for many naval architects over the last three decades. Aside from definition of the wave and operating conditions of interest, other inputs to such codes are typically straightforward definitions of hull and appendage geometries, load conditions and control parameters for fins, rudders or anti-roll tanks. While displacement and centre of gravity data can be obtained relatively easily from stability analysis, either at the design stage or from a stability book once a vessel is in service, obtaining accurate roll, pitch and yaw radius of gyration data is invariably more difficult.rnDiscussed in this paper are approaches to determining radius of gyration information for ships, with a focus on roll radius of gyration. In association with a companion paper [1], accounting for the influence of fluids in tanks when estimating radius of gyration is also addressed. Finally, the sensitivity of motion predictions to variations in assumed roll radius of gyration is examined using a strip theory method.