Global Sensitivity Analysis of High Speed Shaft Subsystem of a Wind Turbine Drive Train

Table 1

Test rig nominal and randomized input parameters.

Parameter	Symbol	Nominal value ()
Motor inertia with respect to axis		0.087 kgm^2
Rotor inertia with respect to axis		0.095 kgm^2
Rotor shaft inertia with respect to axis		0.0003 kgm^2
Rotor inertia with respect to (minor axis)		19.083 kgm^2
Disk inertia with respect to axis		18 kgm^2
Shaft inertia with respect to axis		0.5 kgm^2
Disk mass		14.52 kg
Rotor shaft mass		3.85 kg
Eccentric mass value mounted in the rotor disk		74.4 gr
Distance of eccentric mass from center		8 cm
Rotor shaft and disk mass		18.35 kg
Length from coupling to the tip		0.85 m
Length from coupling to bearing housing		0.72 m
Length from coupling to CG of disk and rotor shaft		0.75 m
Damping factor		0.01 s
Coupling torsional stiffness		2600 Nm/rad
Coupling bending stiffness		56 kNm/rad
Bearing mount lateral and vertical stiffness coefficients		4308 kN/m
Bearing hub bending stiffness
Coupling torsional damping		26 kNm/rad
Coupling bending damping		56 kNm s/rad
Bearing mount lateral and vertical damping coefficients		4308 kN s/m
Bearing friction damping coefficient		0.0023 Ns/m
Rotor torsional damping coefficient plus bearing friction		0.006 Ns/m
Motor torsional damping coefficient		0.006 Ns/m
Shaft bending stiffness		7.6699 kNm^2
Angle dependency factor of
Torque ripples parameters		10 Nm
Backlash gap		0.002 m
Backlash regularization parameter
Bearing torque disturbance zone for defect
Maximum value of rotational bearing defect torque		30 Nm
Maximum value of radial bearing defect torque		30 Nm