Patent ID: 7470114

Claim:
A rotor blade for a wind energy turbine, comprising a longitudinal shell defining a root that connects to a hub of a rotor, a tip, a forward edge and a rearward edge, the shell having a spar including at least one shear web arranged between the forward and rearward edges of the shell and extending in the longitudinal direction of the shell, a vibration damper arranged within the shell and having a pendulum including a beam and a mass element located at one end of the beam, the beam comprising 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, and the 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 between the forward and rearward edges of the shell.