Patent ID: 9567869
Date: 2017-02-14
CPC Classifications: F01D,F03D,F05B,Y02E

Claim:
1. A system for detecting a change in the dynamic behavior of a wind turbine blade, the system comprises: one or more sensors capable of detecting vibrations of the wind turbine blade; an exciter capable of exciting a vibration of the blades, where the exciter has primary and secondary functions, the primary function is for operation of the wind turbine and the secondary function is for vibration excitation, wherein the exciter is a blade actuator, wherein the blade actuator is a pitch actuator arranged for adjusting the pitch of the blade; a signal generator for generating an excitation signal to the exciter for exciting a vibration of the blade; a data acquisition unit for receiving a data signal from the one or more sensors; and a processing unit for determining changes in the dynamic behavior of the blade on the basis of the data signal, wherein the changes in the dynamic behavior of the blade includes a change to a shift of a resonance frequency of the blade from a first frequency to a second frequency.