Fig. 6.12
From: Hydrodynamics of WECs
Upper bounds for a heaving semi-submerged sphere (a), and for a surging semisubmerged sphere (b), both of radius 5 m, and with an incident wave amplitude of 1.0 m. Fully drawn lines shows the absorbed power curves for an optimally controlled buoy. Budal diagram for the heaving sphere extended to also include variation in the wave height H (c). All the diagrams are based on a stroke limit of ±3 m