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Method and device for monitoring the state of rotor blades on wind power installations

  • US 7,883,319 B2
  • Filed: 07/06/2005
  • Issued: 02/08/2011
  • Est. Priority Date: 07/28/2004
  • Status: Expired due to Fees
First Claim
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1. A method for monitoring the state of rotor blades on wind power installations comprising;

  • measuring structure-borne noise of at least one rotor blade with at least one sensor fastened on the rotor blade such that the at least one sensor rotates with the at least one rotor blade,the at least one sensor is connected to a unit for wireless transmission of the output signals of the sensors to an evaluation unit that comprises a central computer unit and storage devices,the output signals of the at least one sensor being wirelessly transmitted to the evaluation unit where, from the signals a frequency spectrum is determined,the frequency spectrum is compared with parameterized reference spectra corresponding to defined states of damage and other particular states and stored in the evaluation unit, and the state of the rotor blade is determined therefrom,a structure-borne noise is measured from a sequence of several individual measurements carried out directly one after the other by the at least one sensor, the beginning of each of said individual measurements being triggered according to a uniform rotational angle of the rotor blade in relation to the rotational axis of the rotor;

    all of the determined frequency spectra of each individual measurement being accumulated to determine the frequency spectrum before being compared with the reference spectra;

    the reference spectra parameterized by means of at least one of meteorological and installation-specific data; and

    the parameters of the reference spectra determined in an up-to-date manner in parallel with the structure-borne noise measurement by means of additional measurements and transferred to the evaluation unit.

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