Control of Rigid Asymmetric Rotors Using Magnetorheological Squeeze Dampers

The article presents an analysis of the dynamic behavior of a rotor with imbalance and an asymmetric load distribution. The rotor system includes a rigid rotor, rolling bearings, and controlled squeeze dampers with magnetorheological fluid. Approximated dependencies of dynamic stiffness and damping coefficients on the relative eccentricity of the damper, rotor speed, and electromagnetic field strength are presented. The trajectories of the rotor system's motion during a scenario of rotor acceleration through the first critical frequency are shown for various variations of the dynamic stiffness and damping coefficients of the magnetorheological squeeze dampers. Waterfall diagrams of the rotor system are presented, illustrating the amplitude-frequency characteristics of the rotor and the main patterns of controlling an asymmetrically loaded rotor. The trajectories of the rotor's motion on magnetorheological squeeze dampers under the control of individual PID controllers are also presented.