Abstract: A wind-turbine tower facility includes a monopile, a transition piece foundation, and a tower disposed on top of the foundation. The tower includes a first cylindrical part and a first outer flange protruding from a lower end of the first cylindrical part toward an outer side of the tower. The foundation includes a second cylindrical part and a second outer flange protruding from an upper end of the second cylindrical part toward an outer side of the foundation. The tower and the foundation are connected by a plurality of stud bolts passing through the first outer flange and the second outer flange. Below the second outer flange, a protruding part is protruding from the second cylindrical part to under the second outer flange.

Abstract: There is presented a tower element, such as a tower element for a tower for a wind turbine generator, said tower element comprising a hollow, tubular element, a flange on an inside surface of the hollow, tubular shell, a unit comprising a platform and a fixation element, such as a plurality of fixation elements, attached to the platform, wherein the unit is arranged with respect to the flange, so that the flange prevents movement of the platform in both directions along an axis being parallel with an axis of the tubular element, and movement of the platform is allowed in at least one direction along an axis being orthogonal to the axis of the tubular element. There is furthermore presented a tower, a wind turbine generator and a method for providing a tower element.

Abstract: The invention relates to a method of installing rotor blades (5) on an offshore wind turbine (2). The method comprises arranging a tower (1) of the wind turbine at an offshore installation site. Then a first end (6) of a tensioner (7) is fastened to at least one of the tower (1), the nacelle (3), and the hub (4) at a distance above sea level. A second end (8) of the tensioner is fastened to a holding device (9,15) floating in the sea at a distance from the tower. Then a pulling force (F) is applied to the tensioner from the holding device at least part of the time while the rotor blades are being mounted to the hub, so that oscillations (M) of the tower due to external forces are dampened during installation of the rotor blades.

Abstract: The present invention relates to a tower damper adapted to be mounted in a wind turbine tower, the tower damper comprising a pendulum structure adapted to be suspended in the wind turbine tower; a plurality of springs arranged to dampen movements of the pendulum structure; a suspension arrangement for suspending the pendulum structure; and a chamber holding a damping liquid into which damping liquid the pendulum structure is at least partly immersed. The present invention further relates to a wind turbine comprising a tower damper.

Abstract: The present invention relates to a preassembly system comprising a support arrangement and a plurality of tower structures each having a mean diameter, D, wherein said plurality of tower structures are placed vertically on the support arrangement during preassembly and/or storage, the support arrangement comprising a set of attachments means for each tower structure, said attachment means being configured for positioning said plurality of tower structures with a mutual distance, a, wherein the ratio a/D is below 2.3, such as below 2.2, such as below 2.1, such as below 2.0 in order to reduce loads on the plurality of tower structures due to Vortex shedding while being secured to the preassembly system. The present invention further relates an associated method and a sea going vessel for transporting a plurality of vertically oriented tower structures.

Abstract: The present invention relates to a wind turbine tower comprising a tower vibration damper (100) with a tuned mass damper and one or more impact damping units (113, 114, 115, 200, 300, 400). The tuned mass damper comprises a pendulum structure (101, 208), a chamber connecting a friction media (112) to the pendulum structure (101, 208) is at least partly immersed, and a suspension arrangement (103-111) suspending the pendulum structure (101, 208) inside the wind turbine tower such that the pendulum structure (101) is allowed to displace from a neutral position towards the outer boundary (102) of the chamber. The impact damping units (113, 114, 115, 200, 300, 400) are positioned between the pendulum structure (101, 208) and the outer boundary (102), such that the outer boundary (102) of the chamber and the pendulum structure (101, 208) may collide via the impact damping units (113, 114, 115, 200, 300, 400).

Abstract: There is presented a tower element, such as a tower element for a tower for a wind turbine generator, said tower element comprising a hollow, tubular element, a flange on an inside surface of the hollow, tubular shell, a unit comprising a platform and a fixation element, such as a plurality of fixation elements, attached to the platform, wherein the unit is arranged with respect to the flange, so that the flange prevents movement of the platform in both directions along an axis being parallel with an axis of the tubular element, and movement of the platform is allowed in at least one direction along an axis being orthogonal to the axis of the tubular element. There is furthermore presented a tower, a wind turbine generator and a method for providing a tower element.

Abstract: The present invention relates to a preassembly system comprising a support arrangement and a plurality of tower structures each having a mean diameter, D, wherein said plurality of tower structures are placed vertically on the support arrangement during preassembly and/or storage, the support arrangement comprising a set of attachments means for each tower structure, said attachment means being configured for positioning said plurality of tower structures with a mutual distance, a, wherein the ratio a/D is below 2.3, such as below 2.2, such as below 2.1, such as below 2.0 in order to reduce loads on the plurality of tower structures due to Vortex shedding while being secured to the preassembly system. The present invention further relates an associated method and a sea going vessel for transporting a plurality of vertically oriented tower structures.

Abstract: The present invention relates to an impact damper assembly for damping oscillations of an associated tower structure, the impact damper assembly comprising one or more impact dampers each comprising a suspension arrangement adapted to be suspended between at least two vertically distanced suspension positions of the tower structure, an impact mass secured to the suspension arrangement, the impact mass being adapted to collide with the tower structure in response to movements thereof, and a tensioner adapted to apply a defined tension to the suspension arrangement in order to adjust the damping characteristics of the impact damper. The present invention further relates to a wind turbine tower having an impact damper assembly attached thereto and a method for damping tower structure oscillations using an impact damper assembly.

Abstract: The present invention relates to a wind turbine tower comprising a tower vibration damper (100) with a tuned mass damper and one or more impact damping units (113, 114, 115, 200, 300, 400). The tuned mass damper comprises a pendulum structure (101, 208), a chamber connecting a friction media (112) to the pendulum structure (101, 208) is at least partly immersed, and a suspension arrangement (103-111) suspending the pendulum structure (101, 208) inside the wind turbine tower such that the pendulum structure (101) is allowed to displace from a neutral position towards the outer boundary (102) of the chamber. The impact damping units (113, 114, 115, 200, 300, 400) are positioned between the pendulum structure (101, 208) and the outer boundary (102), such that the outer boundary (102) of the chamber and the pendulum structure (101, 208) may collide via the impact damping units (113, 114, 115, 200, 300, 400).

Abstract: The present invention relates to a tower damper adapted to be mounted in a wind turbine tower, the tower damper comprising a pendulum structure adapted to be suspended in the wind turbine tower; a plurality of springs arranged to dampen movements of the pendulum structure; a suspension arrangement for suspending the pendulum structure; and a chamber holding a damping liquid into which damping liquid the pendulum structure is at least partly immersed. The present invention further relates to a wind turbine comprising a tower damper.