Nonlinear Vibration Mechanism of the Marine Rotating Machinery with Airbag Isolation Device under Heaving Motion

Table 1

The expression of nondimensional parameter.

Parameter description	Expression
Nondimensional frequency ratio η
Nondimensional time τ
Nondimensional mass ratio h
Nondimensional eccentricity α
Nondimensional displacement of rotor X
Nondimensional displacement of ship X0
Nondimensional speed Ω0
Nondimensional spring stiffness
Nondimensional coefficient
Nondimensional damping
Nondimensional heaving amplitude