Abstract: Elliptical bearings are widely used in many large and critical equipments. Elliptical bearings are usually designed based on certain conditions. However, in the actual operation processes, the speed and load parameter changes affect the dynamic characteristics of rotor bearing support system. The dynamic characteristics under the steady conditions do not meet the actual working conditions. In order to adapt to the time-varying conditions and maintain the stability of the rotor bearing system under different working conditions, an elliptical bearing with adjustable parameters is proposed in this study. By adjusting the oil film gap of the bearing, the influences of ellipticity on the stiffness and damping of the bearing oil film is studied. Then the dynamic analysis for the rotor bearing systems with different ellipticity values is carried out. Finally, a test rig for rotor bearing is set up to verify that the rotor vibration can be effectively suppressed by adjusting the oil film gap of the elliptical bearing.

Key words: elliptical bearing, ellipticity, rotor-bearing system, rotor dynamics, vibration suppression mechanism