Control-Oriented Approach to the Rotor Dynamics

Abstract

A new procedure of the design of rotor vibration control system is presented in the paper. It bases on the decoupling of the rotating system into smaller subsystems to find the dynamical phenomena responsible for rotor instability or pour vibration damping. The procedure is shown in an example of the control system for a simple three-mode model of torsional/lateral rotor vibrations. The root locus method was used to find influences between different vibration modes. It leads to the explanation which intersections of torsional and lateral natural frequency maps are unstable and why. Vibration analysis with help of the control theory methods indicates such control procedures which amplify the stabilizing mechanisms in the rotor dynamics. We are able to find the solutions which also lead to the energy saving control laws. In the case of lateral vibrations there were considered four control strategies. These strategies were compared to indicate an optimal one.