Magnetorheological fluids (MRFs) show a high but reversible rise of viscosity upon application of an external magnetic field. This effect can be utilized in controllable dampers, when a deep understanding of the mechanisms for this behavior is available. Today the design of dampers is still quite empiric so it is favorable to be able to simulate the damper geometries first. Measurements on MR dampers are shown and compared with the results of a combined simulation of the problem with a CFD code for the flow and a FEA code for the magnetic field distribution in the damper geometry. It is shown that the flow resistance of the orifices that corresponds to the damping force of the damper can be predicted with this simulation using a simple fluid model.

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