The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 30, 2003
Filed:
Jul. 18, 2001
Herman F. Veldkamp, Houten, NL;
NEG Micon A/S, Randers, DK;
Abstract
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.