Rigid rotor dynamic stability using Floquet theory

The dynamic behaviour of a rigid rotor elastically connected by a constant speed joint is investigated. The effects of inertial inequalities and stiffness inequalities are evaluated and the stability characteristics are worked out. The Floquet theory is extensively applied to this system in order to obtain the stability limit curves. Comparisons with experimental results obtained by other authors, available in the literature, are reported in order to verify the procedure. Results concerning the unsymmetrical rotors are widely shown through parameters values restricted to realistic cases.