Monitoring of blade frequencies of a wind turbine

F - Mech Eng,Light,Heat,Weapons – 03 – D

Patent

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F03D 11/00 (2006.01)

Patent

CA 2701850

By the invention one or more bolt gauges (6) each with a built-in load cell (LC, not shown) are positioned on a blade bolt or a bearing bolt between a pitch bearing and a nut and tensioned by the nut at the inside or the outside of a hub of a wind turbine. The bolt gauge then outputs a signal descending both from the tension from the bolt/nut connection and the tension from the blade when the blade is vibrated due to wind forces and the rotation of the blade when the hub of the wind turbine is ro-tating. Further a severe and alarming change in each blade frequency is monitored as each blade frequency is compared to the other blade fre-quencies and an alarm is set and/or the wind tur-bine is stopped if a given level is reached.

Selon l'invention, une ou plusieurs jauges de boulon (6), chacune équipée d'un dynamomètre incorporé (LC, non représenté), sont positionnées sur un boulon de pale ou un boulon d'appui entre une articulation de pas et un écrou et sont tendues par l'écrou à l'intérieur ou à l'extérieur d'un moyeu d'une éolienne. La jauge de boulon délivre ensuite un signal découlant à la fois de la tension provenant de l'assemblage boulon/écrou et de la tension provenant de la pale lorsque la pale vibre sous l'effet de forces du vent et de la rotation de la pale lorsque le moyeu de l'éolienne tourne. Ensuite, une variation sévère et alarmante dans chaque fréquence de pale est surveillée par comparaison de la fréquence de chaque pale aux fréquences des autres pales et une alarme est émise et/ou l'éolienne est arrêtée si un niveau donné est atteint.

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