Table 2 Parameter values for the rotor-disk-bearing system.

Young’s modulus (E)

200 GPa

Shaft length (L)

1.00 m

Shaft damping (\(C_r\))

100 Ns/m

Shaft radius (R)

0.020 m

Bearing damping (\(C_b\))

10 Ns/m

Friction coefficient (\(\mu\))

0.2 –

Bearing linear stiffness (\(k_l\))

\(9\times 10^5\) N/m

Disk diameter (D)

0.180 m

Bearing nonlinear stiffness (\(k_{nl}\))

\(2\times 10^9\) N/m

Disk thickness (h)

0.015 m

Density (\(\rho\))

7800 kg/m\(^3\)

Unbalanced mass (\(M_{ud1,2}\))

0.015 kg

Stator radial stiffness (\(k_h\))

\(1.2\times 10^4\) N/m

Eccentricity (\(r_1\))

0.070 m

Stator clearance (\(\delta\))

\(3\times 10^{-4}\) m

Eccentricity (\(r_2\))

0.070 m

Torque reduction coefficient (\(E_1\))

0.035 N\(\cdot\)m

Applied torque(\(E_0\))

276 N.m