DYNAMIC POSITIONING ANALYSIS FOR THE EARLY-DESIGN STAGE OF LARGE YACHTS

In some specific environmentally protected areas, conventional mooring systems cannot be used by Large Yachts for stationing at anchor and therefore, the adoption of a dynamic positioning system is required. It becomes than necessary to evaluate the station keeping capabilities of a yacht since the early-design stage. Adopting a quasi-steady approach, it is possible to perform a standard capability analysis, as commonly done for the offshore industry, obtaining a capability plot as output. However, capability plots are referring to specific wind-wave correlation that are not covering all the possible wave combinations present in a sea area. Here, it is proposed to use a scatter diagram approach for the dynamic positioning analysis of a Large Yacht, considering the specific sea areas were the yacht shall operate, in order to figure out the downtime period of the DP system per each sea area, making possible the ranking of different design solutions. In the present work, use has been made of the MARIN yacht, analyzing five different DP system configurations, ranking them according to downtime period in the Caribbean and Mediterranean Sea