“…It becomes well known that rotor/stator rubbing can induce different kinds of dynamical behaviours, the periodic synchronous full annular rubs [1][2][3][4], sub-and super-harmonic motions [5,6], the quasi-periodic partial rubs [7,8], chaotic responses [9,10], as well as the destructive self-excited dry friction backward whirl [2,11,12].…”