Method for determining fatigue damage in a power train of a...

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

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F03D 11/02 (2006.01)

Patent

CA 2701979

A method for determining the evolution of torque of at least one rotatable shaft (15) and the resulting fatigue damage to different power train components (10) is provided for design and/or maintenance operations in a wind turbine that comprises the steps of determining torque (Tg) at a high speed shaft (35) of the power train (10); determining moment of inertia (Ig) at said high speed shaft (35); determining angular acceleration (.alpha.g) at said high speed shaft (35); and determining torque (Tr) at the low speed shaft (15) of the power train (10) through the formula Tr= (Tg-Ig..alpha.g)i. A rainflow-counting algorithm may be applied to the value of the torque (Tr) at the low speed shaft (15) for determining the number of cycles at ranges of torque for every torque mean value.

L'invention concerne un procédé pour déterminer l'évolution du couple d'au moins un arbre rotatif (15) et l'endommagement par fatigue résultant sur différents composants de transmission (10), lequel procédé étant proposé pour des opérations de conception et/ou d'entretien d'une éolienne, lequel procédé comprend les étapes consistant à déterminer un couple (Tg) à un arbre à vitesse élevée (35) de la transmission (10) ; déterminer le moment d'inertie (Ig) au niveau dudit arbre rapide (35) ; déterminer l'accélération angulaire (ag) au niveau dudit arbre rapide (35) ; et déterminer un couple (Tr) au niveau de l'arbre lent (15) de la transmission (10) avec la formule Tr = (Tg-Ig.ag)i. Un algorithme de comptage de flux de pluie peut être appliqué à la valeur du couple (Tr) au niveau de l'arbre lent (15) pour déterminer le nombre de cycles à des plages de couple pour chaque valeur moyenne de couple.

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