Study on mechanical dynamic performance of new magnetorheological isolation bearing
The permanent magnet can provide an initial magnetic field for the magnetorheological isolation bearing.A new type of isolation bearing is designed by using the permanent magnet and the electromagnetic coil to form a mixed magnetic field function.The magnetic field generated by the coil adjusts the magnetic field of the permanent magnet to change the stiffness of the magnetorheological elastomer layer,and realizes the variable stiffness performance of the isolation bearing.Using ANSYS Electronics software to simulate and analyze the isolation bearing,simulate the magnetic induction intensity inside the test device under different current intensities,draw its magnetic flux density cloud map and calculate its saturation point.The magnetorheological elastomer with 23%carbonyl iron powder was prepared.The effects of excitation current intensity,shear amplitude and excitation frequency on the shear performance of the isolation bearing were studied.The results show that the stiffness of the isolation bearing decreases in real time with the increase of the control coil current,and the variable stiffness characteristics of the magnetorheological elastomer isolation bearing are realized.Under the condition of stiffness softening,the excitation current intensity,shear amplitude and excitation frequency have significant influence on the equivalent stiffness and equivalent damping of magnetorheological elastomer isolation bearing.
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