Abstract: A method for controlling aerodynamic loads in wind turbine (20), includes stopping rotation of blades (22) of the turbine about a rotor shaft axis (38); stopping rotation of a nacelle (30) of the turbine about a vertical yaw axis (36); pitching each blade of the turbine about its respective pitch axis (43) into a stable pitch angle range (52B-52C or 52E-52F) in which a resulting root twisting moment (52) created by a current wind loading (48, 50) on the respective blade is in a direction urging pitch rotation of the blade toward a position of lower root twisting moment; and releasing the blades to rotate passively about their respective pitch axes during subsequent changing wind directions (VR1). A blade may be designed to better align a root zero twisting moment (52A, 52D) in the stable pitch angle range with a minimum (48B, 48D, 50B, 50D) wind loading.

Abstract: A method to manufacture a blade, especially to manufacture a blade of a wind turbine is provided. An arrangement including a mold is provided and used to carry layers of blade-components. A dry-powder is applied at least to an inner surface of the mold, before the layers are arranged onto the inner surface of the mold. Thus the mold includes a dry powder-coat as a bottom layer.

Abstract: A concrete tower manufactured by an apparatus comprising a slipform, which is circumferentially guided in such a way that the slipform slides helically on top of the end face of the tower is provided. During the sliding, concrete is disposed by the slipform to the end face of the tower. After numerous revolutions, a low-cost tower is erected.

Abstract: A method of guiding lightning to a lightning receptor of a rotor blade for a wind turbine, wherein the method includes the following steps: Generating a vortex of airflow by means of a vortex generator, the vortex generator being located at the surface of the rotor blade; attracting the lightning by the vortex; guiding the lightning to the lightning receptor is provided. Furthermore, the invention relates to a rotor blade for a wind turbine, wherein the rotor blade comprises a vortex generator for generating a vortex of airflow, the vortex generator being located at the surface of the rotor blade, and a lightning receptor for receiving an electrical current from the lightning. The vortex generator and the lightning receptor are arranged such with regard to each other that the lightning is guided to the lightning receptor by the vortex which is generated by the vortex generator.

Abstract: A blade for a wind turbine includes at least one heating mat for generating heat, wherein the heating mat is mounted at an outer surface of the blade. The blade further includes at least one through-hole running from an inner space of the blade to the outer surface of the blade. The blade further has at least one conductive element, wherein the conductive element is electrically coupled to the heating mat. The conductive element is inserted in the through-hole for generating an electric connection between the inner space and the outer surface.

Abstract: A method in which a fiber material is laid on a mold surface resembling a negative image of a fiber reinforced structure to be produced. Layering the fiber material on the mold surface includes laying rovings of the fiber material on the mold surface or on a fiber material already laid on the mold surface and applying an low pressure to a space between the rovings and the mold surface.

Abstract: A manufacturing arrangement realized for the manufacture of a rotor blade, including a pair of tracks arranged along the longitudinal sides of a blade mold, a first gantry assembly realized to span the track pair and to carry a first tool arrangement, which first tool arrangement includes at least a fiber distributor, a second gantry assembly realized to span the track pair and to carry a second tool arrangement, and a control arrangement realized to effect a coordinated movement of the gantry assemblies along the track pair and to coordinate the operation of the second tool arrangement with the operation of the first tool arrangement, is provided. A manufacturing line, a method of manufacturing a rotor blade, and a wind turbine rotor blade are further provided.

Abstract: A manufacturing arrangement realized for manufacturing a rotor blade, including a pair of tracks arranged along the longitudinal sides of a blade mold; a first gantry assembly realized to span the track pair and to carry a first tool arrangement including at least a fiber distributor for distributing a fiber material into the blade mold; a second gantry assembly realized to span the track pair and to carry a second tool arrangement realized to carry a supply of fiber material and to provide the fiber material to the fiber distributor; and a control arrangement realized to effect a coordinated movement of the gantry assemblies along the track pair and to coordinate the operation of the second tool arrangement with the operation of the first tool arrangement is provided. A fiber mat magazine; a manufacturing line; a method of manufacturing a rotor blade; and a rotor blade, is also provided.

Abstract: A manufacturing arrangement for the manufacture of a rotor blade, including a pair of tracks arranged along the longitudinal sides of a blade mold, a first gantry assembly realized to span the track pair and to carry a first tool arrangement including at least a fiber distributor for distributing fiber material into the blade mold, a second gantry assembly realized to span the track pair and to carry a second tool arrangement including at least a handling tool for handling a cover sheet for the fiber distributor, which cover sheet is realized to apply pressure to the distributed fiber material, and a control arrangement realized to effect a coordinated movement of the gantry assemblies along the track pair and to coordinate the operation of the second tool arrangement with the operation of the first tool arrangement, is provided.

Abstract: A mounting ring arrangement adapted for alignment of root bushings in a rotor blade root end during a rotor blade assembly step includes a mounting ring segment; and a partial mounting ring, which partial mounting ring is a closed annular component and includes a recess dimensioned to accommodate the mounting ring segment. A method of manufacturing a rotor blade, includes (A) arranging a fibre layup in a first blade mould and arranging a fibre layup in a second blade mould; (B) arranging the partial mounting ring of a mounting ring arrangement in the first blade mould and arranging the mounting ring segment of the mounting ring arrangement in the second blade mould; and (C) joining the first and second blade moulds such that the partial mounting ring and the mounting ring segment join to form a full mounting ring.

Abstract: A supporting rod holding arrangement for manufacturing a root section of a rotor blade of a wind turbine is provided. The supporting rod holding arrangement includes an assembly of a plurality of supporting rods, each having an interface section for connecting to a hub interface of the wind turbine in an essentially circular shape such that there are gaps between the supporting rods, a plurality of first fibres in the gaps which plurality of first fibres are physically and/or chemically compatible with an injection material, and a holding device which holds the supporting rods in the essentially circular shape.

Abstract: A method of manufacturing a root section of a rotor blade of a wind turbine is disclosed. The method includes assembling a plurality of supporting rods with an interface section to a hub interface of the wind turbine in an essentially circular shape such that there are gaps between the supporting rods; arranging first fibers in the gaps which first fibers are physically and/or chemically compatible with an injection material; placing a first molding tool along an outer surface of the circular shape and a second molding tool along an inner surface of the circular shape, treating the injection material so that it bonds with the first fibers. The invention also concerns a supporting rod holding arrangement for such purpose and a root section of a rotor blade manufactured by such method.

Abstract: A rotor blade of a wind turbine with a first rotor blade segment and a second rotor blade segment is provided. The rotor blade has a hollow space surrounded by a shell. The first rotor blade segment is connected with the second rotor blade segment by a bolt connection. The bolt connection has a first connection of the first rotor blade segment, a second connection of the second rotor blade segment, and a bolt establishing a bolted joint between the first connection and the second connection. At least the bolt is situated in the hollow space of the rotor blade. Furthermore, a method of connecting a first rotor blade segment of a rotor blade of a wind turbine and a second rotor blade segment of the rotor blade is provided.

Abstract: A method for manufacturing a component for a wind turbine is provided. In a first step, a fiber material is laid onto a mold surface. In a further step, an uncured foam material is provided on top of the fiber material. Thereafter, the uncured foam material is cured to form a core member. Then, a resin impregnating the fiber material is cured to form the component. Thus, a core member for a component of a wind turbine can be provided easily.

Abstract: A mold assembly includes a first mold part with a first mold opening and a second mold part with a second mold opening. The first mold part and the second mold part are separate parts. A rotating device rotates the second mold part from a position in which the second mold opening faces upwards to a position in which the second mold opening faces downwards. A moving device moves the first mold part and/or the second mold part relative to each other such that the second mold part is located above the first mold part. A closing device moves the first mold part and the second mold part towards each other with the first and second mold openings facing each other until the first and second mold parts engage. Further, a method of closing a mold assembly is provided.

Abstract: A mould for moulding a wind turbine blade includes a mould inside surface suitable for receiving a film. The film includes a film outside surface for lining the mould and a film inside surface for receiving a wind turbine blade component layer prior to a curing of the wind turbine blade component layer. The film inside surface and the film surface are realised to allow a complete detachment of the wind turbine blade from the mould after the curing of the wind turbine blade. The mould also includes a vacuum extraction outlet for applying a vacuum to extract air from between the film and the mould inside surface.

Abstract: A method for manufacturing a work piece is provided. The method includes preparing fiberglass in a mold, preparing a closed mold cavity around the fiberglass, flushing the closed mold cavity with an oxygen-free gas, injecting resin in the closed mold cavity, and curing the casted work piece. Furthermore, a work piece manufactured by the above method is provided.

Abstract: A wind turbine tower arrangement (10), having: a concrete tower (12) including an upper portion(14) and a base portion (16); a footer (22) beneath the base portion; a plurality of tendons (30), each tendon spanning an entire height of the concrete tower, at least a portion of each tendon arranged external to concrete (42) forming the concrete tower, and each tendon is pre-stressed to provide compressive force to the concrete in the concrete tower; and a plurality of pilings (28). The tendons are secured by the plurality of pilings.

Abstract: A method of molding a wind turbine blade in a mold is provided. The method includes applying a film to an inside surface of a mold, assembling component layers for the wind turbine blade on the film, performing curing to harden the component layers, and subsequently removing the cured wind turbine blade from the mold. Also provided is a film suitable for use in a wind turbine blade molding process and a mold suitable for molding a wind turbine blade.

Abstract: A method for controlling aerodynamic loads in wind turbine (20), includes stopping rotation of blades (22) of the turbine about a rotor shaft axis (38); stopping rotation of a nacelle (30) of the turbine about a vertical yaw axis (36); pitching each blade of the turbine about its respective pitch axis (43) into a stable pitch angle range (52B-52C or 52E-52F) in which a resulting root twisting moment (52) created by a current wind loading (48, 50) on the respective blade is in a direction urging pitch rotation of the blade toward a position of lower root twisting moment; and releasing the blades to rotate passively about their respective pitch axes during subsequent changing wind directions (VR1). A blade may be designed to better align a root zero twisting moment (52A, 52D) in the stable pitch angle range with a minimum (48B, 48D, 50B, 50D) wind loading.