A semi-submersible crane vessel for use in assembling a wind turbine and for installation by means of a crane of the vessel of the assembled wind turbine on a foundation. At an assembly station, the hull of the vessel is provided with a mast-receiving well that is sunk into, or through, the hull, preferably a well that extends into, or through a support column of the hull, which well is configured to receive therein at least a portion of the mast of the wind turbine during an assembly step of the wind turbine. For example, the mast-receiving well has a depth of at least 15 meters, e.g. at least 30 meters, measured from the deck of the deckbox structure.

A load mitigation arrangement of a non-mounted rotor blade, includes at least one actuatable lift-modification device arranged on a surface of the rotor blade; a monitor configured to estimate the magnitudes of loads acting on the non-mounted rotor blade; a controller configured to actuate the lift-modification device on the basis of the estimated magnitudes to mitigate the loads acting on the non-mounted rotor blade. Further provided is a rotor blade assembly, and a method of performing load mitigation on a non-mounted rotor blade.

Among other things, the present disclosure relates to a wind turbine rotor blade that can be assembled at the site of its wind turbine. The blade includes an internal structure which may be pre-fabricated with connections to the shell skin prior to being transported to the site of its wind turbine. A filler material may be injected into the layers of fabric making up the shell skin at the wind turbine site and allowed to harden at approximately atmospheric conditions.

Systems to reduce the loads on highly flexible aircraft cargo, such as wind turbine blades, are disclosed. Such systems can be active and/or passive. Active systems can be in the form of open or closed loop active control systems comprising one or more sensors on the airframe and/or payload, actuators acting on the payload, and/or an electronic controller. Passive systems can include spring-and-damper suspensions, optionally combined with devices such as vibration absorbers, and can be controlled, for example, by the placement of payload fixtures and the degrees of constraint they impose on the payload.

A structure body cutting system includes a cutter system mounted on a cutting side trailer and configured to cut a blade to be cut, and a feeder system mounted on a feeding side trailer and configured to send out the blade to the cutter system. The blade is placed so as to straddle between the cutter system and the feeder system. The feeder system sends out the blade to the cutter system as the feeding side trailer comes close to the cutting side trailer. The cutter system cuts the blade into a plurality of cut segments by cutting the blade sent out from the feeder system.

A system (50) for handling a structural member (44) of a blade (10) of a wind turbine (2), comprising a member support (52) configured for supporting the structural member (44), the member support (52) being configured to be mounted to a base (51), and a plurality of member turning devices (60) positioned along a longitudinal axis (54) of the member support (52), the plurality of member turning devices (60) being connected to the member support (52) and configured for turning the structural member (44).

An operations and maintenance arrangement for floating wind turbines (1), comprising a floating sub-structure (2) on which at least one wind turbine unit (3) is situated, a service operation vessel (11) and a portable crane (14), said floating sub-structure (2) having an interface capable of receiving and fixedly locking said crane (14) to said sub-structure (2), said service operation vessel (11) having a ship crane (12) capable of lifting said portable crane (14) from said vessel (11) and onto said sub-structure (2). A method for replacing components using the arrangement is also described.

A flat-packable wind turbine assembly kit, includes a flat-packed bendable airfoil having an upper edge and a lower edge. The flat-packed bendable airfoil is capable of assuming a predefined curvature upon assembly. The flat-packed bendable airfoil includes upper connecting elements distributed along the upper edge and lower connecting elements distributed along the lower edge of the flat-packed bendable airfoil. The flat-packed bendable airfoil also includes a flat-packed upper plate including an upper mating orifices distributed in a contour corresponding to the predefined curvature. Further, the flat-packed bendable airfoil includes a flat-packed lower plate including lower mating orifices distributed in the contour corresponding to the predefined curvature. Thus, upon assembly when the upper connecting elements are connected to the upper mating orifices and when the lower connecting elements are connected to the lower mating orifices, the flat-packed bendable airfoil assumes the predefined curvature.

Among other things, the present disclosure relates to a wind turbine rotor blade that can be assembled at the site of its wind turbine. The blade includes an internal structure which may be pre-fabricated with connections to the shell skin prior to being transported to the site of its wind turbine. A filler material may be injected into the layers of fabric making up the shell skin at the wind turbine site and allowed to harden at approximately atmospheric conditions.

An airfoil rack arrangement for supporting the airfoils of a plurality of rotor blades is provided, including a number of upright support structures; and a number of airfoil carrier brackets, wherein an airfoil carrier bracket is constructed to extend outward from a support structure. The airfoil rack arrangement includes an airfoil carrier bracket is rotatably mounted to a support structure and configured to rotate between a loading position in which the airfoil carrier bracket is positioned to support the airfoil of a rotor blade, and an unloading position in which the airfoil carrier bracket is out of the path of a rotor blade being lifted vertically.