A turbine blade for a wind turbine is provided, including a blade body with a leading-edge, wherein the blade body is provided with a form changing device covering the leading-edge and extending at least partially along the leading-edge, which form changing device includes a shell fixed to the blade body, which shell is movable by an actuator between a first position close to the leading-edge and a second position distanced to the leading-edge.

A wind turbine rotor blade is provided including a deformation arrangement, which deformation arrangement includes a plurality of linear actuators, wherein each linear actuator is arranged at the suction side of the rotor blade, wherein a longitudinal axis of a linear actuator is aligned with a longitudinal axis of the rotor blade, and wherein each linear actuator is realized to alter its length in response to an excitation signal; and an interface configured to receive a corrective control signal and to issue excitation signals to the linear actuators on the basis of the corrective control signal. Also provided is a wind turbine and a method of operating a wind turbine.

The present disclosure relates to methods (400, 500) for reducing vibrations in parked wind turbines (10), assemblies (82) comprising vibration mitigating devices (300) for wind turbine blades (22) and wind turbines (10). An assembly (82) comprises a vibration mitigating device (300) configured to be arranged around a wind turbine blade (22) of a wind turbine (10) and comprising one or more inflatable bodies (305) and one or more air flow modifying elements (310); and a pressure source (98) configured to inflate and/or deflate one or more of the one or more inflatable bodies (305) based on measurements of a sensor system (97) configured to monitor the wind turbine (10) and/or environmental conditions around the wind turbine (10).

A turbine blade for a wind turbine is provided, including a blade body with a leading-edge, wherein the blade body is provided with a form changing device covering the leading-edge and extending at least partially along the leading-edge, which form changing device includes a shell fixed to the blade body, which shell is movable by an actuator between a first position close to the leading-edge and a second position distanced to the leading-edge.

A wind turbine that includes a plurality of turbine blades. Each of the plurality of turbine blades includes a plurality of openings that extend through each of the plurality of turbine blades, the plurality of openings are adapted to be opened or closed, and at least one of the plurality of openings is adapted to be opened to allow air to flow therethrough.

A multi-layer composite body that includes a first composite layer having a first elasticity parameter and a second composite layer mechanically coupled with the first composite layer. The second composite layer may have a second elasticity parameter that is different from the first elasticity parameter of the first composite layer. The first composite layer and the second composite layer may extend in a continuous manner with respect to each other, forming a substantially two-dimensional, homogenous structure. Further, the first composite layer and the second composite layer may respond to a common external mechanical force in a different manner.

An assembly and associated method of operation for a wind turbine blade of a wind turbine includes a vibration mitigating device configured to be arranged around the blade. The vibration mitigating device includes a main body configured to extend chord-wise around and encircle the blade, the main body having at least one inflatable body. Inflatable air flow modifying elements extend radially outward from the main body. A pressure source is connectable to the inflatable body and the air flow modifying elements to inflate the inflatable body and the airflow modifying elements based on measurements of a sensor system that monitors a condition of the wind turbine or an environmental condition around the wind turbine.