Variable inertia damper using magnetorheological fluid

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  • 磁気粘性流体を用いた可変慣性ダンパ

Abstract

<p>The author developed a vibration suppression device that utilized magneto-rheological fluid (MR fluid) and long bypass pipe in order to get an effect of series inertia mass. The inertia effect due to the series inertia mass makes natural frequency of 1DOF system lower, and it also cut off vibration at anti-resonance frequency. Amplitude of the effect depended on not only a cross sectional area of bypass pipe but also fluid density and length of bypass pipe. If the cross sectional area can be switched when diameter of the bypass pipe makes virtually changeable for clustering particles of MR fluid under strong magnetic field by electromagnets; the variable inertia effect which acts as the series inertia mass might be artificially derived. In this paper, to confirm the variable inertia effect, trial damper which had twelve electromagnets along the bypass pipe was manufactured and dynamic properties of the damper were measured in some current cases of electromagnets. Finally, variable inertia effect was confirmed experimentally.</p>

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