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The dynamic behavior of a small-scale magnetorheological damper intended for use in a tremor-suppression orthosis is characterized through experimental analysis and mathematical modeling. The combined frequency response of both the electromagnetic coil and the fluid particles is modeled by a third-order transfer function. The output of this function is an effective current that, combined with piston position and velocity, is empirically related to the resistance force of the damper. The derived model demonstrates high-fidelity to experimental testing of the damper under variable piston velocity and applied current within the expected frequency range of pathological tremor. The model is, thus, deemed suitable for use in a control algorithm for the mechanical suppression of tremor via magnetorheological damping.
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Case et al. (2014) studied this question.
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