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Unbalance response of micro gas bearing-rotor system considering rarefaction effect

The unbalance response of micro gas bearing-rotor system is calculated using the fourth-order Runge–Kutta method based on the motion equation of the rotor, in which the nonlinear gas film force is obtained from solving the modified Reynolds equation using the alternating direction implication algorithm. The study shows that the proper eccentric mass of the rotor can improve the stability of micro gas bearing-rotor system. Compared with the result without considering the gas rarefaction effect, the stability threshold speed of micro rotor system considering the gas rarefaction effect is increased. Meanwhile for the same mass eccentricity, the peak value emerges at the lower rotation speed, which shows that the unbalance eccentric mass will influence the motion of micro rotor system more greatly when the gas rarefaction effect is taken into account.