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This study presents the experimental and theoretical evaluation of an MR (magnetorheological) isolator using multiple fluid modes including shear, flow and squeeze. For doing so, a novel type of multi-mode MR isolator against multi-degree-of-freedom excitations is proposed and fabricated. The experimental testing of the proposed MR isolator is conducted by an MTS machine and its damper characteristics are experimentally evaluated by equivalent damping and complex stiffness methods. To construct a theoretical model of the MR isolator, its dynamic equation is derived and important model parameters are identified by the force averaging method using the force—displacement or the force-velocity plots. Using the theoretical model, the damper characteristics of the MR isolator are also predicted and compared to those computed using the experimental data.

The experimental and theoretical development of a multiple fluid mode magnetorheological isolator is addressed in this study. First of all, a multiple fluid mode magnetorheological isolator that operates using shear, flow, and squeeze modes, and can isolate multi-degree-of-freedom excitations, is configured and fabricated. The damper characteristics of the magnetorheological isolator are experimentally evaluated using metrics of equivalent viscous damping and complex stiffness. To analytically predict the damper characteristics of the magnetorheological isolator, the Bingham-plastic isolator model is constructed and its important model parameters are identified using an averaging method derived from sinusoidal force-displacement and force-velocity data. Comparison of the measured and predicted results using the Bingham-plastic isolator model is conducted. To improve model prediction ability, a nonlinear hysteretic model is introduced. Comparison of the two isolator models is conducted using extensive experimental results.

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