KETEP 세계에너지시장정보

A method for tracking a gear tooth meshing angle of a gearbox (3) of a wind turbine, the method comprising the steps of: - selecting an initial reference virtual gear tooth meshing angle of the gearbox (3), - monitoring an angular position of a high speed shaft (6) and/or a low speed shaft (4) of the gearbox (3), - estimating a virtual gear tooth meshing angle relative to the reference virtual gear tooth meshing angle, based on the monitored angular position of the high speed shaft (6) and/or the low speed shaft (4) and on information regarding topology of the gearbox (3), - calculating a number of full rotations of the high speed shaft (6) and/or the low speed shaft (4) which corresponds to an integer number of full periods of gear meshing of the gearbox (3), based on information regarding topology of the gearbox (3), - resetting the reference virtual gear tooth meshing angle each time the high speed shaft (6) and/or the low speed shaft (4) has performed the calculated number of full rotations, and continuing monitoring the angular position of the high speed shaft (6) and/or the low speed shaft (4) and continuing estimating the virtual gear tooth meshing angle relative to the reset reference virtual gear tooth meshing angle, and - applying the estimated virtual gear tooth meshing angle to a periodic noise signal of the wind turbine.