The Analysis of a Smart Jeffcott Rotor with Direct Velocity Feedback Control in the Supercritical Range

Abstract

The paper discusses the analysis of the active control of a Jeffcott rotor with the rotational speed in the supercritical range. By the application of collocated sensors and actuators and a suitable control algorithm it has been possible to influence the internal damping of the rotor, which is the origin of self-induced vibrations. By this approach it is possible to increase the range of the stable operation of the rotor. In the paper, a classical analytical two-degree-of-freedom Jeffcott rotor model has been extended to account for the presence of piezoelectric patch sensors and actuators. The applicability of this model has been positively verified through the comparison with the finite element results derived using the Ansys software. Plots have been obtained by both the analytical approach and the finite element method that demonstrate the applicability of velocity feedback to increasing the threshold of instability of the rotor.