LARGE SEA BUOY AT PRESET WAVE RESISTANCE AND STABILITY Russian patent published in 2007 - IPC B63B22/00 

FIELD: navigational aids for deep-water areas at approach to ports and harbors subjected to considerable swell.

SUBSTANCE: vertical size of proposed buoy exceeds its diameter by 3-5 times; buoy body has watertight damper-neutralizer at depth of 2-6 m from surface; its volume is no less than 10% of main body volume. Damper has upper and lower taper surfaces. Outer edges of upper surface of damper-neutralizer are rounded-off at radius of 0.05-0.1 of radius of damper horizontal surface. Solid ballast arranged in lower part of buoy body is made in form of stacked disks at diameter D_s.b. equal to 1.2-1.4 of average diameter of immersed body D_im.b. ; averaged diameter of main body and its total depth T_im.b., sizes of damper-neutralizer of wave load, mass of solid ballast and buoy displacement are determined depending on preset useful load, rated swell, depth of laying the buoy, requirements for metacentric height and required degree of neutralization of wave disturbing forces.

EFFECT: reduced mass of buoy at preset wave resistance.

2 dwg