Rotors supported on journal bearing are widely used throughout the modern industrial world. Above a certain value of rotor speed, these rotor-bearing systems become unstable due to self-excited vibrations. To ensure stability and guarantee reliable operation, the vibrations of the rotor bearing system has to be controlled. This work focuses on a 2-stage controller tuning methodology for stabilization of rotor supported on a journal bearing. The tuning strategy uses LQR based tuning and elements

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... of fractional order control to give an approximated integer order PID controller. This approach enables us to achieve the digital/ analog realization of Fractional Order PID (FOPID) controller.