Abstract: A mandrel for producing a fiber-reinforced composite part, in particular a blade for a wind turbine is disclosed. The mandrel includes an expandable body with an outer surface onto which a fiber material of the fiber-reinforced composite part is layable out. The expandable body is expandable in an expanded state, wherein in the expanded state the outer surface forms an interior shape of the fiber-reinforced composite part to be produced. Moreover, the expandable body is collapsible in a collapsed state.

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 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 wind turbine tower is made of reinforced concrete with fibre rovings as reinforcements, wherein the fibre rovings are basalt fibre rovings. In one embodiment, the basalt fibre rovings may include, for example, a bundle of multiple parallel oriented basalt fibers forming a thin rope.

Abstract: A mold part is provided. The mold part includes a surface with a mold opening, a first arm with a connecting means for connecting a first pulley, the first arm being pivotably attached to a first attachment point of the mold part, a second arm with a connecting means for connecting a second pulley, the second arm being pivotably attached to a second attachment point of the mold part, wherein the second arm is arranged to be locked in at least two different turning positions.

Abstract: A radially twisted wind turbine blade (10), including a radially twisted spar web (122), wherein a center (78) of a radial cross section of a base (12) of the blade rotates within a plane of rotation (80), and wherein at a base (12), a radial cross section of the spar web forms a first angle (82) with the plane of rotation, and at a tip (32) a radial cross section of the spar web forms a second angle (130) with the plane of rotation different than the first angle.

Abstract: A wind turbine blade (10) with asymmetric spar caps (36,38). The blade includes a pressure side spar cap (36) having pressure side fibers (56) having a pressure side fiber diameter (54), the pressure side fibers configured to resist a first flap deflection (20) in a first direction via tensile strength; and a suction side spar cap (38) having suction side fibers (50) having a suction side fiber diameter (52), the suction side fibers configured to resist the first flap deflection via a compressive strength. At a radial cross section, the suction side spar cap exhibits a greater compressive strength and the pressure side spar cap, for example, by the suction side fibers having a different compressive strength than the pressure side fibers.

Abstract: A mold assembly comprises a first (1) and a second mold part (2) said mold assembly further comprising a hinge mechanism optionally detachably connected to the two mold parts.

Abstract: Producing a composite structure comprising fibre reinforced material impregnated with liquid resin by means of vacuum assisted resin transfer moulding, by method of: providing a forming structure comprising a rigid mould part and a second mould part; placing the fibre material in the rigid mould part; sealing the second mould part against the rigid mould part, forming a mould cavity; connecting a source of uncured fluid resin to at least one resin inlet communicating with the mould cavity; connecting at least one vacuum outlet communicating with the mould cavity; evacuating the interior of the forming structure through at least one vacuum outlet, measuring at least one vacuum outlet airflow level; supplying uncured resin from the source of uncured resin to the mould cavity through at least one resin inlet so as to fill the mould cavity with resin; and curing the resin in order to form the composite structure.

Abstract: A method for producing a composite structure comprising fiber reinforced material by means of vacuum assisted resin transfer molding is described. The fiber material is impregnated with liquid resin, and the method comprising the steps of: a) providing a forming structure comprising a rigid mold part and a second mold part, b) placing the fiber material in the rigid mold part, c) sealing the second mold part against the rigid mold part to form a mold cavity, d) connecting a source of uncured fluid resin to at least one resin inlet communicating with the mold cavity, e) connecting at least one vacuum outlet communicating with the mold cavity, f) evacuating the interior of the forming structure through the at least one vacuum outlet, g) supplying uncured resin from the source of uncured resin to the mold cavity through the at least one resin inlet so as to fill the mold cavity with resin, and h) curing the resin in order to form the composite structure.

Abstract: A facility for manufacturing a rotor blade of a wind turbine is provided. The facility includes an injection machine for injecting an injection material into a mould to form the rotor blade, a movable tank system for accommodating precursor material to be supplied to the injection machine for preparing the injection material, wherein the movable tank system has wheels for moving the tank system. Further, a method for setting up a facility and a method for manufacturing a rotor blade are described.

Abstract: An apparatus (100) for transporting a wind turbine blade (10) on at least two railcars over a railway is provided. The apparatus includes a root end support (22) for supporting the root end (12) of the blade, a mid span support (28) for supporting the mid span (14) of the blade, and a tip displacement limiter (24) for restricting a tip end (16) of the blade from extending beyond a lateral transportation limit (30) imposed by the railroad. The tip displacement limiter exerts a force on the blade which is counter to a force exerted on the blade by the mid span support only when the railcars navigate a design basis curve (32) in the railway to cause a bending of the blade in order to avoid exceeding the lateral transportation limit. The apparatus is particularly useful for the transportation of extra-long or curved wind turbine blades.

Abstract: An apparatus (100) for transporting a wind turbine blade (10) on at least two railcars over a railway is provided. The apparatus includes a root end support (22) for supporting the root end (12) of the blade, a mid span support (28) for supporting the mid span (14) of the blade, and a tip displacement limiter (24) for restricting a tip end (16) of the blade from extending beyond a lateral transportation limit (30) imposed by the railroad. The tip displacement limiter exerts a force on the blade which is counter to a force exerted on the blade by the mid span support only when the railcars navigate a design basis curve (32) in the railway to cause a bending of the blade in order to avoid exceeding the lateral transportation limit. The apparatus is particularly useful for the transportation of extra-long or curved wind turbine blades.

Abstract: A wind turbine blade (10) including: a spar cap (18) having first fibers (38) oriented parallel to a longitudinal axis (40) of the blade (10); and a fiber member (50, 52, 54, 56, 58) joined to the spar cap at a joint (30, 32, 34) and having second fibers (80). The second fibers are oriented at a first angle (?, ?) relative to the longitudinal axis along portions remote (100, 130) from the joint and are curved toward the longitudinal axis in a harmonizing region (102, 122, 132) proximate the joint.

Abstract: A method for controlling a resin flow in a closed mould cavity during a vacuum assisted resin transfer moulding process is disclosed. The used closed mould cavity includes at least one resin inlet and a number of resin outlets. Each resin outlet is operatively connected to an inlet of a container. Each container includes an outlet which is operatively connected to a vacuum pump. The method includes evacuating the closed mould cavity through the resin outlets by the vacuum pump, injecting liquid resin into the closed mould cavity, measuring the resin fill level in each container during the injection of liquid resin into the closed mould cavity and adjusting the applied pressure at each container outlet depending on the measured resin fill level in the particular container.

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 basic core component is provided for forming, together with at least one another basic core component, a core structure of a rotor blade of a wind turbine. The basic core component includes a precasted base element being made from a foam material, and a resin receiving layer, which is adhered to at least one surface of the precasted base element. When, during a casting procedure, the resin receiving layer adjoins the surface of another basic core component, the resin receiving layer is adapted to receive resin such that, after hardening the received resin, the basic core element and the another basic core element are mechanically connected with each other.

Abstract: The present invention relates to a method for producing a composite structure comprising fiber reinforced material by means of vacuum assisted resin transfer molding, where fiber material is impregnated with liquid resin. The method comprises an evacuation process of a mold cavity by initially providing an under-pressure in a part of the mold cavity in order to provide a first vacuum front having a first pressure gradient oriented towards a first side of the forming structure, and a second vacuum front with a second pressure gradient oriented towards a second side of the forming structure, and controlling the first vacuum front and the second front to move towards the first side and the second side of the forming structure, respectively.

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

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 fibres in the gaps which first fibres 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 fibres. The invention also concerns a supporting rod holding arrangement for such purpose and a root section of a rotor blade manufactured by such method.