Patent ID: 9206786
Filing Date: 2015-12-08
Classification: F03D,F05B,Y02E

Abstract:
1. A method for acoustically monitoring the existence of loose objects inside a wind turbine, comprising: monitoring a sound generated in a rotating part of the wind turbine during operation of the wind turbine; analyzing the sound with respect to specific parameter values of the sound within at least one specific frequency range, wherein frequencies within at least one of the specific frequency ranges are at least partially filtered, wherein the at least one specific frequency range and/or specific parameter value is derived from a database and/or the at least one specific frequency range and/or specific parameter value is determined during the operation of the wind turbine and/or of a wind turbine specimen representative of the wind turbine, wherein a number and/or a duration of occasions of detections is/are integrated of the specific parameter values and/or values representing a level of the specific parameter values from the sound generated; and generating a signal when such specific parameter values are detected.