Crack Parameters Identification Based on a Kriging Surrogate Model for Operating Rotors

Table 1

Parameters of the cracked rotor.

Parameters	Value (units)
Shaft length ()	0.6 m
Shaft diameter ()	0.01 m
Position of bearing 1 ()	0.015 m
Position of bearing 2 ()	0.575 m
Bearing stiffness	9.6 × 10^5 N/m
Bearing damping	500 Ns/m
Position of disc 1 ()	0.095 m
Position of disc 2 ()	0.505 m
Disc diameter	0.074 m
Disc thickness	0.025 m
Disc eccentricity (e)	2 × 10^−5 N/m
Unbalance orientation angle	0
Density of steel	7.8 × 10^3 kg/m^3
Young’s modulus	3.11 × 10^11 Pa
Poisson’s ratio	0.3
Gravitational acceleration	9.8 m/s^2
Rayleigh damping coefficient ()	0.6842
Rayleigh damping coefficient ()	2.8012 × 10^−5
First critical speed	2520 r/min
Rotating speed	840 r/min
Measuring point ()	0.145 m
Measuring point ()	0.245 m
Measuring point ()	0.345 m
Measuring point ()	0.445 m