The present invention relates to an assembly for lowering a pile onto a seabed, the assembly comprising: a floating vessel (24) comprising a vessel positioning system (42), a crane (12) provided on the vessel for lowering the pile (10) onto the seabed, a pile guiding system (50) configured to guide the pile during the lowering thereof by the crane, the pile guiding system comprising: o a base (40) connected to the vessel, o at least one pile guiding frame (20) comprising an annular portion (21), o one or more primary actuators (55) which are configured for moving the pile guiding frame, o one or more secondary actuators (60) connected to the annular portion of the pile guiding frame, o at least one frame position sensor (62) for measuring an excitation parameter, o a guiding control unit (64) comprising an excitation controller (80) configured to control the actuators and a resilience controller configured to control a stiffness.

A vessel for use in installation of a wind turbine on a floating foundation is provided, where both the vessel and the floating foundation are in floating condition and subject to sea-state induced motions. The vessel includes a floating hull; a crane including a hoisting system to suspend the wind turbine; a mast alignment system provided to engage on the wind turbine mast of the suspended wind turbine, and bring and maintain the wind turbine mast in alignment with the mounting axis of the floating foundation in order to compensate for sea-state induced motions; and a restraining system arranged to restrain the floating foundation only in a horizontal plane relative to the floating hull of the vessel and to allow for both sea-state induced heave motion and sea-state induced tilt motions in one or more vertical planes of the mast mounting structure relative to the hull of the vessel.

A windmill construction (10), comprising a rotor-nacelle assembly (12) with blades (14), a tower (16), a substructure (20) and a foundation (22). The substructure (20) comprises a first guide collar (24) and a second guide collar (26) for support of the tower (16), said first guide collar (24) being located in a lower part of the substructure (20) and said second guide collar (26) being located in an upper part of the substructure (20). The substructure (20) comprises a jack-up assembly (30) for receipt of modular tower segments (18), said tower segments (18) are arranged to be assembled in the substructure (20) and erectable by the jack-up assembly (30) to produce an assembled tower (16). The invention is also directed to a method for assembly of a windmill construction.

The disclosure relates to a floating wind turbine platform, comprising: a substantially triangular hull configurable to support a wind turbine tower; the hull comprising a first, second and third column, the first, second and third columns being connected by a first, second and third pontoon member, as well as by a first, second and third connector.

A method and a system (1) for controlling transfer of a suspended load (2) between an offshore wind turbine (3) and a floating vessel (4) are disclosed. Movements, relative to the floating vessel (4), of a load (2) suspended in a hoisting mechanism (6, 15) and/or of a hooking part (9) of the hoisting mechanism (6, 15), are detected. A position and/or inclination of a landing platform (8) arranged on the floating vessel (4) is adjusted, based on the detected movements, in order to compensate for relative movements between the floating vessel (4) and the suspended load (2) and/or the hooking part (9), thereby synchronizing movements of the landing platform (4) to movements of the suspended load (2) and/or the hooking part (9), while moving the suspended load (2) and/or the hooking part (9) towards the adjustable landing platform (8).

A method for installing a floating offshore wind generator includes loading an anchor, moving a semi-submersible crane vessel to a site, and installing the anchor at the site, by an anchor management section of the crane vessel, loading a hull and mooring the crane vessel to a quay wall, by a hull management section, pre-assembling wind power equipment on the hull while the crane vessel is moored at the quay wall for a certain period of time, by a wind power equipment pre-assembly section, towing the hull whose pre-assembly is complete from the quay wall to the site, and fixing the anchor and the hull by a mooring line, by a control section, installing an offshore substation by an offshore substation installation section, and installing a submarine cable by a submarine cable installation section.

Described is a method for lifting an object from a vessel deck. A hoisting means present on the vessel deck is provided with a hoisting cable to which an attaching means for the object is coupled. The object is connected to the attaching means and then taken up and displaced relative to the vessel deck using the attaching means. The swinging movements of the attaching means and of the object connected thereto, occurring under the influence of wave and wind forces, are damped during displacement by a gyroscope which is connected to the hoisting cable, attaching means and/or object and which includes a rotation-symmetrical body rotating around a primary rotation axis.

The invention relates to a floating foundation for wind turbine generators and a method for installing a wind turbine generator on top of and performing maintenance on said foundation. The floating foundation includes a tower and two support legs pivotally connected to the tower, forming a tripod-like structure. The floating foundation may include hydrodynamic damping elements and a single point mooring system leaving the foundation free to weathervane. The invention also relates to a method for using the structure as a crane, lowering and raising the turbine platform against and from e.g. a service barge during maintenance or assembly.

The disclosure relates to a floating wind turbine platform, comprising: a substantially triangular hull configurable to support a wind turbine tower; the hull comprising a first, second and third column, the first, second and third columns being connected by a first, second and third pontoon member, as well as by a first, second and third connector.

A method and system for horizontally mating an offshore wind turbine generator assembly, typically including a tower and wind turbine nacelle and blades, with a substructure platform to form an integrated substructure unit, wet towing the unit to installation site offshore, and then installing the unit independent of cranes and derricks.