Reliability based design optimization of a two-stage wind turbine gearbox

Open Access

Table 2

Operating conditions.

Motor Torque	100N.m
Bearing stiffness	$k_{1}^{x} = k_{2}^{x} = k_{1}^{y} = k_{2}^{y} = 10^{8} N / m .$
Shaft torsional stiffness	$k_{1}^{θ} = k_{2}^{θ} = 10^{5} N/m .$
Pressure angle	α₁=α₂=20°
Moment inertia of the rotor	2587kg²
Rotor angular velocity	ω_rot=13rad/s
Generator velocity	1500rpm
Power coefficient	C_p=44%
Air density	ρ_air=1,225kg.m³
Rotor radius	R=6m
Basic radius of wheels	$r_{12}^{b} = 0.8 m, r_{21}^{b} = 0.2 m, r_{31}^{b} = 0.5 m, r_{32}^{b} = 0.1 m .$

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