A vessel with three platformsan outer hull, an inner deck hull and a passenger carriage, having four independent suspension systems there between so as to accommodate for the multi axis movements of the outer hull. This multi axis suspension system spread between the three platforms will offer the passenger carriage stability against the pitch, yaw and roll rotations a vessel makes as it twists and turns going up and down the slope of a wave as well as the heave, sway and surge movements induced by the waves pushing the vessel around and or the ship sliding down the face of a wave.

By mutually interconnected specimens of a suppression element (100) according to the invention, there can be formed a strong and reliable construction of a tube around a tubular element. The suppression element (100) has a first fin structure (141) which is extending helically along a portion (121) of a first longitudinal edge (121, 131, 131 A, 131B), and a second fin structure (142) which is extending helically along a portion (122) of an opposite second longitudinal edge (122, 132, 132 A, 132B). In said tube, first fin structures and second fin structures of the various suppression elements are lying helically in-line relative to one another for effectively reducing vortex induced vibrations. The suppression elements (100, 200, 300, 400) are compactly stackable relative to one another.

A hull attitude control apparatus (1) includes: an outboard engine (3) that includes a propeller (12) which is provided on a hull (2) and generates a thrust force at the hull (2) and a propeller drive motor (9) which drives the propeller (12); an attitude control portion (4) that controls an inclination angle of a propeller rotation axis line (S2); an outboard engine control portion (20) that performs a drive control of the propeller drive motor (9); and a shake detection sensor that detects a shake of the hull (2). The attitude control portion (4) and the outboard engine control portion (20) perform a drive control of the propeller (12) so as to prevent shaking of the hull (2) based on a detection result of the shake detection sensor.

A floating driller having a hull, a main deck, an upper cylindrical side section extending downwardly from the main deck, an upper frustoconical side section, a cylindrical neck section, a lower ellipsoidal section that extends from the cylindrical neck section, and a fin-shaped appendage secured to a lower and an outer portion of the exterior of a bottom surface. The upper frustoconical side section located below the upper cylindrical side section and maintained to be above the water line for a transport depth and partially below the water line for an operational depth of the floating driller.

A continuous vertical tubular handling and hoisting buoyant structure has a hull, a main deck, an upper neck extending downwardly from the main deck, an upper frustoconical side section, an intermediate neck, a lower neck that extends from the intermediate neck, an ellipsoidal keel and a fin-shaped appendage secured to a lower and an outer portion of the exterior of the ellipsoid keel. The upper frustoconical side section is located below the upper neck and maintained to be above a water line for a transport depth and partially below the water line for an operational depth of the buoyant structure. An automated stand building system mounted to the hull is in communication with a controller and configured to make up the marine risers, make up casing, and make up drill pipe.

A watercraft includes a hull having inner and outer surfaces and at least one collapsible strake coupled to the hull. The collapsible strake includes a movable skin hingedly coupled to the hull. The collapsible strake also includes a dampening element and a negative stiffness element each extending from an inner surface of the movable skin to the outer surface of the hull. The movable skin is configured to rotate between an uncollapsed configuration having a first stiffness and a collapsed configuration having a second stiffness greater than the first stiffness.

Disclosed herein are a floating platform and a floating offshore wind power generator with the same. The floating offshore wind power generator according to an embodiment includes a power generator disposed on an upper portion and configured to perform a wind power generation action, and a floating platform configured to support the power generator while floating on the sea. The floating platform includes a plurality of floats provided in the form of a hollow cylindrical shape and erected in a vertical direction, a connecting beam connecting and binding between the plurality of the floats, and a strake having a spiral shape and provided on an outer circumference of a lower region of each of floats while avoiding a connecting position of the connecting beam.

Methods and systems are provided for nautical stationkeeping of free-floating objects. In one example, a method includes adjusting translational motion of a body freely floating in water by rotating the body. The translational motion may be adjusted, for instance, to maintain the body within a geographic area. In certain examples, the adjustment of the translational motion may be realized via a Magnus effect induced by rotating the body. The body may be configured as, for example, a free-floating object such as a wave engine.

A suspension system for a marine vessel, the marine vessel including a body portion at least partially supported relative to at least a left hull and a right hull by the suspension system, the left and right hulls being moveable relative to each other and the body, the suspension system including resilient supports between the body portion and the left and right hulls. The suspension system providing at least a roll stiffness being arranged to provide a roll moment distribution (RMD) of the suspension system wherein roll forces effectively act at a position disposed within a longitudinal distance along the marine vessel from a steady state position of the resultant pressure forces acting on the left and right hulls when the marine vessel is operating in a planing or semi-planing mode. The longitudinal distance can be 20% or less of a waterline length of one of the at least a left and a right hull at design load in displacement mode.

A marine wind power generation floating body according to an embodiment of the present disclosure can be coupled to a tower used for wind power generation and is provided at sea. The marine wind power generation floating body includes a floating main body which is formed at a predetermined length and which has a circular transverse cross section, a ballast part positioned on one side of the floating main body, a damping plate positioned at one end of the floating main body, and formed with a diameter that is larger than the outer diameter of one side of the floating main body, and a pitching/rolling damping part which is positioned on the other side of the floating main body, and which damps the horizontal pitching and rolling of the floating main body.