A pile holding system is to be mounted on a deck of a vessel, e.g. for installation of a pile adapted to support an offshore wind turbine. The pile holding system is configured to support the pile in an upright position at a pile installation location next to the vessel. A vessel is provided with such a pile holder system. A method for installation of a pile and a pile holder are also disclosed.

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.

Provided is a floating-type on-water support apparatus comprising: a ball in which a guide groove is formed along a circumferential surface thereof; a floating unit including a floating part which floats on water and supports the ball so that the ball is rotatable; and a support rod of which one end is exposed above the water so that a structure is installable thereon and the other end is heavier than the one end so that the support rod stands vertically and which passes through the circumferential surface and is coupled to the ball, wherein the floating unit further includes a restriction protrusion fitted into the guide groove to restrict the ball from being rotated about an axis of the support rod.

Provided is a floating-type on-water support apparatus comprising: a ball in which a guide groove is formed along a circumferential surface thereof; a floating unit including a floating part which floats on water and supports the ball so that the ball is rotatable; and a support rod of which one end is exposed above the water so that a structure is installable thereon and the other end is heavier than the one end so that the support rod stands vertically and which passes through the circumferential surface and is coupled to the ball, wherein the floating unit further includes a restriction protrusion fitted into the guide groove to restrict the ball from being rotated about an axis of the support rod.

The disclosure provides a wave sheltering vessel used to reduce the significant wave height of waves. The wave sheltering vessel includes a hull, a plurality of anchors, and a propeller system. A length of the hull is greater than or equal to 60 meters. A ratio of the length to a design draft of the hull is less than or equal to 6.5. A ratio of the length to a breadth of the hull is less than or equal to 3.5. A ratio of the breadth to the design draft of the hull is less than or equal to 2.3. The anchors are installed at the hull along a longitudinal direction of the hull. The propeller system is disposed at the hull.

The disclosure provides a wave sheltering vessel used to reduce the significant wave height of waves. The wave sheltering vessel includes a hull, a plurality of anchors, and a propeller system. A length of the hull is greater than or equal to 60 meters. A ratio of the length to a design draft of the hull is less than or equal to 6.5. A ratio of the length to a breadth of the hull is less than or equal to 3.5. A ratio of the breadth to the design draft of the hull is less than or equal to 2.3. The anchors are installed at the hull along a longitudinal direction of the hull. The propeller system is disposed at the hull.

A floating offshore wind turbine includes a rotor and a generator turned by the rotor. An elongated buoyant body supports a tower that supports the generator and rotor. The buoyant body or the tower may support aerodynamic features to counteract heeling forces or to steer the floating wind turbine as it swings on its anchor line. The floating offshore wind turbine may be configured to move the anchor line force vector to counteract heeling forces. A control system may control the aerodynamic features and the movement of the anchor line force vector.

In a conventional vessel anti-rolling apparatus, because a large memory capacity and a high-speed high-function computing processing unit are required, the cost of the vessel anti-rolling apparatus is caused to rise. A vessel anti-rolling control apparatus and an anti-rolling control method according to the present disclosure includes an azimuth controller that outputs a first steering-angle command value for making the vessel turn to an azimuth to which the vessel should travel, based on an azimuth command signal and a yaw-angle signal, an anti-rolling controller that outputs a second steering-angle command value for reducing rolling of the vessel, based on a rolling-angle signal, a rolling-angular-velocity signal, and a vessel-speed signal, and a steering-angle controller that controls a steering angle, based on the first steering-angle command value and the second steering-angle command value.

In a conventional vessel anti-rolling apparatus, because a large memory capacity and a high-speed high-function computing processing unit are required, the cost of the vessel anti-rolling apparatus is caused to rise. A vessel anti-rolling control apparatus and an anti-rolling control method according to the present disclosure includes an azimuth controller that outputs a first steering-angle command value for making the vessel turn to an azimuth to which the vessel should travel, based on an azimuth command signal and a yaw-angle signal, an anti-rolling controller that outputs a second steering-angle command value for reducing rolling of the vessel, based on a rolling-angle signal, a rolling-angular-velocity signal, and a vessel-speed signal, and a steering-angle controller that controls a steering angle, based on the first steering-angle command value and the second steering-angle command value.

Various embodiments of a submerged submersible sailing vessel are disclosed. Such a submerged sailing vessel may comprise a submersible hull assembly, a keel coupled to and extending upwards from hull assembly towards a water surface, and a wind-catching assembly coupled to and extending upwards into the air from the keel for propelling the submerged sailing vessel. The hull assembly and the keel are submerged below the water surface as the vessel is propelled by the wind-catching assembly above the water surface.