Abstract: In order to effectively control the vibration transmitted by the elastic supports of the aero-engine rotor, an active magnetic dry friction damper (AMDFD) is employed to tune the support damping. On the basis of the traditional dynamics model of the dual rotor system, an AMDFD-dual rotor-bearing seat dynamics model that can characterize the transmitted vibration of the support is established. The effectiveness of AMDFD in suppressing the transmitted vibration of the rotor supports is simulated by using a speed interval switching controller and a model-free adaptive controller, and the intrinsic principle in realizing suppression is elucidated. Using the AMDFD-twin-rotor system test rig, the test of transmitted vibration control when rotor passes through the multi-order critical speeds was carried out. The results show that the AMDFD controlled by aforementioned two controllers can effectively reduce the transmitted vibration at each bearing position, and the reduction is more than 52%.