초록 ▼

A wind turbine blade has an oscillation damper provided in the blade for damping oscillations of the blade, in particular edgewise oscillations of the blade in the rotational plane of a rotor on which the blade is mounted. The damper comprises a U-shaped cavity in which a saturated solution of sodiu

A wind turbine blade has an oscillation damper provided in the blade for damping oscillations of the blade, in particular edgewise oscillations of the blade in the rotational plane of a rotor on which the blade is mounted. The damper comprises a U-shaped cavity in which a saturated solution of sodium chloride in water may oscillate in counter-phase with the oscillations of the blade. The upper end of the arms of the U-shaped cavity are connected with a passage way so that an O-shaped cavity is provided. The cavity may be tuned to dampen oscillations of the first natural edgewise frequency or the second natural edgewise frequency of the blade or the damper may comprise both types of dampers. Furthermore, blades comprising dampers having a cylindrical element may roll in a box in the blade and dampers can have a resiliently suspended pendulum.

대표청구항 ▼

A wind turbine blade has an oscillation damper provided in the blade for damping oscillations of the blade, in particular edgewise oscillations of the blade in the rotational plane of a rotor on which the blade is mounted. The damper comprises a U-shaped cavity in which a saturated solution of sodiu

A wind turbine blade has an oscillation damper provided in the blade for damping oscillations of the blade, in particular edgewise oscillations of the blade in the rotational plane of a rotor on which the blade is mounted. The damper comprises a U-shaped cavity in which a saturated solution of sodium chloride in water may oscillate in counter-phase with the oscillations of the blade. The upper end of the arms of the U-shaped cavity are connected with a passage way so that an O-shaped cavity is provided. The cavity may be tuned to dampen oscillations of the first natural edgewise frequency or the second natural edgewise frequency of the blade or the damper may comprise both types of dampers. Furthermore, blades comprising dampers having a cylindrical element may roll in a box in the blade and dampers can have a resiliently suspended pendulum. ionally opened and closed individually by means of a valve, and through which compressed air flows out in the upward direction from beneath through the transporting plane, and the valves of the air nozzles and the transporting platform being designed such that they interact with one another depending on the position of the transporting platform relative to the transporting plane, wherein the valves of the air nozzles are designed as solenoid valves equipped with a magnet coil, and wherein the transporting platform has ferromagnetic regions which interact with the magnet coils of the solenoid valves in dependence on the position of the transporting platform relative to the transporting plane, and wherein a non-magnetic cover plate is arranged between the magnet coils and the transporting plane and the air nozzles are formed by bores in the cover plate, the method comprising: measuring the inductance of the magnet coils, which can be changed by the interaction of the moving transporting platform with the magnet coils of the solenoid valves; and opening solenoid valves that are located beneath the transporting platform in accordance with the measured inductance of their magnet coils in order to generate the air cushion by passage of the air through the air nozzles formed in the cover plate. 11. The method as claimed in claim 10, wherein the extent and/or the position of the transporting platform are/is determined from the measured inductances of the magnet coils. 12. The method as claimed in claim 10, wherein, utilizing the interaction between the transporting platform and the magnet coils of the solenoid valves, the transporting platform is moved in a predetermined movement direction by selected solenoid valves being switched on and off.