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This paper shows the effect of angular spring and angular damping coefficients of oil film on the stability characteristics of an elastic rotor supported in circular journal bearings. A theoretical Jeffcott rotor model considering the angular spring and angular damping coefficients are constructed, and stability threshold speeds and stability margin were calculated under wide operating conditions. Comparing to the model neglecting the angular spring and angular damping coefficients, the angular spring and angular damping coefficients do not affect on the stability of the rotor-bearing system when the stiffness of the rotating shaft is high. On the other hand, when the shaft is very flexible, Sommerfeld number at the stability threshold speed increases, indicating the angular spring and angular damping coefficients improve the stability of the rotor-bearing system.

Effects of Angular Spring and Angular Damping Coefficients of Oil Film on Stability Characteristics of Elastic Rotor Supported in Circular Bearings