sin αst

Moment and direction (CW) Value
Mx -4.86 Nm
My 202 Nm
FURLING AND YAW ANALYSIS
Table I.1: Reaction moments due to dead-weight load of the top of the wind turbine
Reaction force due to thrust load
The reaction force in the bearings due to the thrust loading at a wind speed of 4 m/s is
calculated:
Where Ar is the projected area of the rotor equal to 0.691 m 2 , V is the wind speed of 4 m/s
and Cf is a force coefficient of 2 according to IEC 64100-2 [5, p. 79].
Bearing forces
From the dead-weight reaction moments and the thrust load, the bearing reaction forces
are calculated. The moments from the dead-weight load are converted in to force couple,
as illustrated in figure I.2. The directions of the arrows show the actual directions of the
forces.
1
Ftf.x
2 Ar V 2 �
Cf � 13.5N
Figure I.2: Illustration of moments and force couples due to loading on the bronze bearings
(I.1)
203