Feedback control of a single mass rotor on rigid supports

Abstract

This paper considers a single mass flexible rotor on rigid supports with proportional and derivative feedback control. Undamped and damped free vibrations of the rotor-control system are considered as well as unbalance response. Results indicate that proportional control alone increases the rotor critical speed, but does not affect the system damping. Proportional control alone also decreases the system logarithmic decrement which tends to make the system more susceptible to external vibration excitations. Derivative feedback control acts to increase the system damping, to reduce the response sensitivity, and is highly desirable.