The so-called phase-locked delayed feedback control method is applied to a Jeffcott rotor supported by rolling-element bearings but with negative damping and then to the same rotor supported hy journal bear ings, to improve the stability of motion of the rotor. The control parameters arc determined in terms of the characteristic equation of the controlled rotor. The results of numerical simulations show that the stability of motion of the rotor is greatly improved with the help of the phase-locked delayed feedback control method.
Faragher, J.S., 1996, Stability Improvement of Periodie Motion of Helicopter Rotor Blades, Ph.D. dissertation, Department of Mechanical and Manufacturing Engineering, University of Melbourne, Australia.
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