The counter-rotating dual-rotor system in aeroengines can reduce the influence of rotors' gyroscopic moments on aircrafts

cut down the torque of cases and improve the flexibility of airplanes.The steady-state response of a counter-rotating dual-rotor structure with one inter-shaft bearing was analyzed

of which the low pressure rotor is coupled with the inter-shaft bearing's outer ring

and the high pressure rotor coupled with the inter-shaft bearing's inner ring.By using transfer matrix method and corresponding boundary conditions

the steadystate responses of the counter-rotating dual-rotor system were analyzed

and the changing characteristics of the disks' orbits and the centroids' locations were studied experimentally

proving the relevant conclusions from calculations.