Take three-fixing-lobe bearings

which are not concentric supporting elastic Effort rotor as the research subject.Based on considering the stiffness and damping characteristics of journal bearing

dynamic coefficients of journal bearing and damping critical speed were solved by programming and calculating.The influences of bearing parameters

such as length-to-diameter ratio

minimum clearance ratio and preload coefficient on the damping critical speeds of the system were obtained.The results show that the damping critical speeds of the system are influenced by the structure parameters of journal bearing;damping critical speeds are higher than critical speeds of system which are not considered bearing damping;increasing length-to-diameter ratio and decreasing minimum clearance ratio and preload coefficient

damping critical speeds are increased.