A shear mode magnetorheological (MR) fluid damper and its experimental application for vibration control in a single-disk cantilevered rotor are introduced. The theoretical model of the rotor system is established, and the responses of the rotor system are simulated and compared with the experimental results. It is found that as the Coulomb friction of the damper is increased, the vibration amplitude of the rotor system is decreased near the initial critical speeds, but is increased in a speed range between the first and the second initial critical speeds. At the same time, the first critical speed of the rotor is increased clearly, but the second critical speed disappears. A simple on-off control method is proposed to obtain the best control effect for rotor vibration in the whole speed range.
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