Patent ID: 9074583
Filing Date: 2015-07-07
Classification: F03D,F05B,Y02E

Abstract:
1. A method for operating a wind energy installation ( 10 ) with a rotor ( 12 ) and at least one rotor blade ( 14 ), which can be adjusted in terms of its angle of attack, comprising the steps of: accelerating the rotor blade ( wherein a rotor-blade bending vibration with a vibration amplitude and a vibration frequency is excited, wherein the vibration amplitude of the rotor-blade bending vibration increases with each of the adjustment operations, wherein the rotor-blade bending vibration is a pivoting vibration, wherein the adjustment operations take place in succession temporally such that a time between two consecutive adjustment operations in a same direction does not deviate more than +10% or −10% from an inverse first pivoting natural frequency of the rotor blade, wherein a rotor rotation with a rotor rotation frequency below one fifth of the vibration frequency is present, and wherein the rotor blade (