B. A. Output (Force). x. Input ( Valve Displacement ). Tank. Pump. Code. X. S1. S2. S3. X. Calculating Blade Loads. Lift = 0.5* v 2 *Area* ρ *C L Drag = 0.5* v 2 *Area* ρ *C D Where C L &C D = f( Angle of Attack ). Lift. Drag. Rotation Wind = Rotor Speed( ω )* radius.
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B
A
Output(Force)
x
Input(Valve
Displacement)
Tank
Pump
Code
X
S1
S2
S3
X
Calculating Blade Loads
Lift= 0.5*v2*Area*ρ*CL
Drag= 0.5*v2*Area*ρ*CD Where CL&CD= f(Angle ofAttack)
Lift
Drag
Rotation Wind = Rotor Speed(ω)*radius
Positive
Pitch Angle (θ)
InflowAngle
Pure Wind(Vinf)
α
ResultantWind
Angle ofAttack(α)
InflowAngle
PitchAngle
=

Pure Wind
Rotation Wind
= atan
ControlStructureforPitchControl
Pitch AngleCommand
ValvePosition
Desired AngleofAttack
DesiredRotor Speed
+
Control
Control

InflowAngle
ActualRotor Speed
Limit PitchtoStable Region
ControlStructurefor Yaw Control
Yaw RateCommand
TorqueCommand
YawCommand
Control
Control
Limit Rateto 0.5 deg/s
Nacelle
Yaw Angle
Nacelle
Yaw Rate
Pitch
Wind
Blades
Geartrain
Generator
Hub
Yaw
Tower
Grid