Patent ID: 11905926
Assignee: SHANGHAI ENVISION DIGITAL CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  G  Y | IPC F  G

Claim 6:
7. A server for inspecting a wind turbine blade, wherein the wind turbine blade is a blade in a wind power generation device, the wind power generation device further comprising a tower provided with a sound acquisition device that is mounted away from the wind turbine blade; and
the server comprises:
a sound acquirer, configured to acquire, via the sound acquisition device, a sound signal generated by an impingement of wind on the wind turbine blade, wherein the sound signal comprises a sound signal generated by sliding of air between blades in the case that the wind impinges on the wind turbine blade;
a frequency spectrum generator, configured to:
extract a signal envelope from a time domain signal diagram formed by the sound signal by calling a signal analysis algorithm;
determine a position of a point, where a wave trough appears on the signal envelope, in a time domain as a segmentation point; and
convert the sound signal into a frequency spectrogram, and obtain a segmented frequency spectrogram by segmenting the frequency spectrogram based on the segmentation point; and

a damage recognizer, configured to obtain a damage recognition result of the wind turbine blade by performing image recognition on the segmented frequency spectrogram based on a damage recognition model, wherein the damage recognition model is obtained by training a neural network model.