Analysis on rubs of double rotor-stator coupling system

Since the double rotor structure has been applied largely in aircraft engine, the double rotor-stator coupling system of an Aircraft engine has simplified the rotor system into double rotor-stator coupling dynamic system, in which the bearing was simplified into spring and damping. Considered the coupling of the low pressure rotor and high pressure rotor through the intermediate bearing, the fourth-order partial differential equations of motion of the continuum double rotor multi-disk-stator system were formed. Applying the variable step size fourth order Runge-Kutta method, rub response of the double rotor system was simulated, analyzed the affect of speed and intermediate bearing's stiffness to the rub response, found some nonlinear dynamic characteristics of the double rotor model when rubs happened, which provides some reference methods for the actual engineering problems and has certain engineering significances.