Apparatus and method for determining a resonant frequency of...

Details Apparatus and method for determining a resonant frequency of... Apparatus and method for determining a resonant frequency of...

2009-03-12

2011-10-25

Hollington, Jermele M (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S652000, C324S076390, C324S076760, C324S076490, C324S076440, C324S076510, C324S076610, C324S076680, C324S076740, C073S488000, C708S300000, C702S056000, C702S077000, C290S044000, C290S055000, C700S290000, C700S291000, C700S287000, C416S041000, C416S147000, C415S001000

Reexamination Certificate

active

08044670

ABSTRACT:
An apparatus for determining a resonant frequency of a wind turbine tower is provided. The apparatus includes a processing unit configured to receive an acceleration measurement value, the acceleration measurement value representative of the acceleration of the wind turbine tower in the direction parallel to a rotor rotational axis of the wind turbine and/or in the direction perpendicular to both the rotor rotational axis and the tower axis of the wind turbine. The apparatus includes a memory configured to store a series of acceleration measurement values, and the processing unit includes a Fourier transform module configured to calculate a spectral vector based on calculating a convolution-based fast Fourier transform of the series of acceleration measurement values, and includes a resonant frequency calculation module configured to calculate the tower resonant frequency based on the calculated spectral vector.

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