This paper focuses on the influence mechanism of magnetorheological damper (MR damper) on the dynamic characteristics of a rotor system and its damping effect. In this work, the structure of an MR damper in the form of a double coil is designed. The magnetic circuit of the MR damper is analysed by the finite element method and verified by experiments. Then, the MR damper is assembled into a rotor system and a general model of a rotor-bearing system supported by MR damper is proposed, in which the magnetorheological fluid (MR fluid) is modelled as lubricating oil with bilinear characteristics. The finite element model of the rotor system is established and solved by the Newmark-β method. The results indicate that the structure of the damper is reasonable and can reach the magnetic induction intensity required for MR fluid saturation. With an appropriate current, the MR damper has better performance in vibration suppression. However, if the applied current is not appropriate, the nonlinearity of the MR damper is excited, which results in the instability of the rotor system. This research discovers the influence mechanism of the MR damper to a rotor system, which is helpful for the vibration control of a rotor system and the design of the MR damper. [ABSTRACT FROM AUTHOR]
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