US 12,352,238 B2
Determination of a state of a wind turbine blade
Efren Albisu Iso, Barcelona (ES); Mauro Grammatico, Barcelona (ES); and Pedro Arroyo Beltri, Barcelona (ES)
Assigned to General Electric Renovables Espana, S.L., Barcelona (ES)
Filed by General Electric Renovables Espana, S.L., Barcelona (ES)
Filed on Aug. 3, 2023, as Appl. No. 18/364,592.
Claims priority of application No. 22382763 (EP), filed on Aug. 5, 2022.
Prior Publication US 2024/0044314 A1, Feb. 8, 2024
Int. Cl. F03D 17/00 (2016.01)
CPC F03D 17/011 (2023.08) [F03D 17/017 (2023.08); F05B 2270/331 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for detecting a state of a wind turbine blade, the method comprising:
receiving a load signal from a sensor configured to measure loads on the wind turbine blade;
determining an energy of the load signal at a first frequency, and determining an energy of the load signal at a second frequency, wherein the first frequency corresponds to a natural frequency of the wind turbine blade in a default state and the second frequency corresponds to a natural frequency of the wind turbine blade with an accumulation of ice above an allowable threshold, wherein the natural frequency of the wind turbine blade is a frequency of a first normal mode or of a second normal mode of the blade in the default state, wherein the first normal mode refers to a lowest resonant frequency and corresponding first oscillation mode, wherein the second normal mode refers to a second lowest resonant frequency and corresponding second oscillation mode;
comparing the energy of the load signal at the first frequency to the energy of the load signals at the second frequency; and
generating a flag signal when the energy of the load signal at the first frequency is smaller than the energy of the load signal at the second frequency.