Fig. 1

Schematic of an aero-engine with rubbing faults (color online)"

Fig. 2

Schematic of the rotor-stator system (color online)"

Fig. 3

Schematic of the connecting model between disks and drums (color online)"

Fig. 4

Schematics of the rubbing model: (a) stationary status; (b) rotational status; (c) enlarged view of the rubbing region (color online)"

Fig. 5

Rotor-stator system: (a) schematic of the system with rubbing; (b) FEM (color online)"

Table 1

Information of the FEM"

Fig. 6

Spectrum cascades of the rotor-stator system: (a) node of the drum at the position (Rdr, 0); (b) node of the center of Disk 3; (c) node of the inner ring at the position (Rin, 0); (d) node of the inner ring at the position (Rin, π/2). In these figures, the combination of numbers and multiplication signs indicates frequency multiplication; for example, 4× represents four times the rotating frequency (color online)"

Fig. 7

Whirling orbits and phase diagrams of the rotor-stator system: (a) whirling orbits of the drum node at the position (Rdr, 0); (b) phase diagrams of the drum node at the position (Rdr, 0) (color online)"

Fig. 8

Distributions of the rubbing positions and normal rubbing force on the inner ring and the drum: (a) ω=3 000 r/min; (b) ω=3 400 r/min; (c) ω=4 100 r/min; (d) ω=5 100 r/min; (e) ω=5 800 r/min; (f) ω=6 300 r/min (color online)"

Fig. 9

Slipping time proportion ϵs in a steady-state period, where N represents the number of bolts (color online)"