Identification Method of Shaft Orbit in Rotating Machines Based on Accurate Fourier Height Functions Descriptors

Table 2

Shaft orbit shapes of different faults.

Fault types	Shapes of shaft orbits
Misalignment	Banana-shaped
Unbalance	Ellipse
Oil whip	Inner “8”
Misalignment	Outer “8”
Oil whirl	Petal-shaped