Abstract:
A rotor blade for a wind turbine is provided, the rotor blade comprising an acoustically porous surface layer at least partially covering at least one surface of the rotor blade, at least one reactive acoustic element located below said acoustically porous surface layer, and a resistive acoustic layer located between said acoustically porous surface layer and said at least one reactive acoustic element.
Abstract:
A gear integrated generator for a wind turbine having a tower, a nacelle, and a hub is described. The gear integrated generator includes: a stator supporting frame having a stator supporting portion, a radially extending portion and a rotor frame supporting portion, wherein the stator supporting frame is stationarily mountable within the nacelle. A rotor frame is rotatably supported on the rotor frame supporting portion of the stator supporting frame. The rotor frame is connected to the hub and a gear, that is driven by the rotor frame. The gear includes a ring gear stationarily mounted to the stator support frame, a carrier gear assembly, and a ring-shaped sun gear. The gear integrated generator further includes: a rotor generator ring support frame rotatably supported and radially positioned outward of the rotor frame supporting portion of the stator supporting frame.
Abstract:
A rotor blade assembly and a method for reducing the noise of a rotor blade for a wind turbine are disclosed. The rotor blade has surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root. The rotor blade assembly further includes a noise reducer configured on a surface of the rotor blade, the noise reducer including a plurality of noise reduction features. Each of the plurality of noise reduction features includes a first surface and a second surface. The first surface includes a first portion mounted to one of the pressure side or the suction side and a second portion configured to interact with wind flowing past the other of the pressure side or the suction side. The second surface interrupts an aerodynamic contour of the one of the pressure side or the suction side.
Abstract:
A rotor blade 1 comprises a main blade section 10, and an extension flap 20. The extension flap 20 is translationally moveable relative to the main blade section 10. At least the main blade section 10 and the extension flap 20 form an airfoil lifting surface of the blade. A dimension of the airfoil lifting surface is variable by translationally moving the extension flap 20 relative to the main blade section 10.
Abstract:
A method for controlling noise from a wind park that has a plurality of wind turbines includes monitoring noise emission from the wind turbines in at least a near field area and utilizing a transfer function of noise emission to determine a noise impact importance of the wind turbines at one or more locations in a far field area beyond a boundary of the wind park. The method further includes determining which, if any, wind turbines to operate in a noise-reduced operation mode in accordance with the noise impact importance determination and controlling operation modes of the wind turbines in accordance with the determination of which, if any, wind turbines to operate in a noise reduced mode.
Abstract:
A modular rotor blade hub for a wind turbine rotor includes a plurality of segments, wherein at least one segment includes at least one face abutting against at least one face of at least one adjacent segment, and wherein at least one of said faces extends from an outer periphery of the hub to a central region of the hub. Further, methods for mounting a wind turbine including a modular hub are provided.
Abstract:
A lift device for a rotor blade and a method for increasing the lift of a rotor blade for a wind turbine are disclosed. The rotor blade has exterior surfaces defining a pressure side and a suction side extending between a leading edge and a trailing edge. The lift device includes a first aerodynamic surface configured for mounting to the pressure side of the rotor blade, and a second opposing aerodynamic surface configured to interact with wind flowing past the lift device. The lift device has a generally increasing cross-sectional area in a flow direction of the wind. The lift device is configured to increase the lift of the rotor blade.
Abstract:
A blade for a wind turbine includes a chord plane having one spanwise portion with a first curvature and another spanwise portion with a second curvature that is different from the first curvature.
Abstract:
A rotor blade for a wind turbine is provided, the rotor blade comprising an acoustically porous surface layer at least partially covering at least one surface of the rotor blade, at least one reactive acoustic element located below said acoustically porous surface layer, and a resistive acoustic layer located between said acoustically porous surface layer and said at least one reactive acoustic element.
Abstract:
The rotor blade for a wind energy turbine comprising a longitudinal shell defining a root to be connected to a hub of a rotor, a tip, a forward edge and a rearward edge, the shell having a spar including two spar caps connected via at least one shear web arranged between the forward and rearward edges of the shell and extending in the longitudinal direction of the shell, and a structural damping system arranged within the shell and having a pendulum including a damped sandwich beam and a mass element located at one end of the beam. The beam comprises a sandwich structure including at least three layers comprising at least one damping middle layer arranged between and connected to outer layers of an elastic material. The sandwich beam is connected to the at least one shear web in a cantilevered manner such that the mass element is proximal to the tip of the shell and the beam can be oscillated in a direction towards and away from the forward and rearward edges of the shell.