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1. (WO2017190745) METHOD OF IDENTIFYING A FAULT IN A SYSTEM OF GEARS IN A WIND TURBINE

Pub. No.:    WO/2017/190745    International Application No.:    PCT/DK2017/050135
Publication Date: Fri Nov 10 00:59:59 CET 2017 International Filing Date: Fri May 05 01:59:59 CEST 2017
IPC: G01H 1/00
G01M 13/02
G01M 1/08
G01H 1/16
Applicants: VESTAS WIND SYSTEMS A/S
Inventors: RAMAKRISHNAN, Pattabiraman Trichy
NARAYANPUR, Mallikarjun
Title: METHOD OF IDENTIFYING A FAULT IN A SYSTEM OF GEARS IN A WIND TURBINE
Abstract:
A method of identifying a fault in a system of gears in a wind turbine is provided. The method determines (204) a first centre harmonic frequency amplitude according to vibrations of the system of gears and determines (205) a plurality of sideband amplitudes of the first centre harmonic frequency amplitude. Further, the method calculates (206) an average sideband amplitude from the plurality of sideband amplitudes and determines (207) a value indicative of damage incurred by the system of gears based upon the first centre harmonic frequency amplitude and the average sideband amplitude. The method may be implemented by a controller which may be used to control a wind turbine or wind park based on the value indicative of damage. The method may obtain additional centre harmonic frequency amplitudes for use in identifying a fault in a system of gears. The centre harmonic frequencies may be harmonic tooth mesh frequencies and the value indicative of damage may be a ratio of the centre harmonic frequency amplitude and a difference between the centre harmonic frequency amplitude and the associated average sideband amplitude or vice versa. The method may analyse the value of any ratio obtained and use the ratio values to identify, and monitor the progress of, a fault.