Patent ID: 11905927
Assignee: VESTAS WIND SYSTEMS A/S
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC B  F

Claim 13:
14. A method for monitoring operation of a wind turbine including a rotor having a blade and that rotates in a rotor plane having a plurality of sectors, the method comprising:
receiving a time-domain signal indicative of a pitch force being applied to the blade;
determining a first spectral density of the time-domain signal by sampling the time-domain signal to generate a discrete time-domain signal, selecting a plurality of samples from the discrete time-domain signal that are within a sampling window corresponding to a first period of time when the blade is in a selected sector of the plurality of sectors, and transforming the plurality of samples from a time-domain to a frequency-domain;
determining a condition of the wind turbine based on a frequency content of the first spectral density; and
in response to the condition being indicative of a problem with the wind turbine, generating an alarm signal.