| 摘要 |
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. |
