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A Magnetorheological Damper with Bifold Valves for Shock and Vibration Mitigation

Department of Aerospace Engineering, Alfred Gessow Rotorcraft Center University of Maryland, College Park, MD 20742 USA

Wei Hu

Department of Aerospace Engineering, Alfred Gessow Rotorcraft Center University of Maryland, College Park, MD 20742 USA

Young-Tai Choi

Department of Aerospace Engineering, Alfred Gessow Rotorcraft Center University of Maryland, College Park, MD 20742 USA

Norman M. Wereley

Department of Aerospace Engineering, Alfred Gessow Rotorcraft Center University of Maryland, College Park, MD 20742 USA, wereley{at}umd.edu

This study presents the design and fabrication of a flow-mode bifold magnetorheological (MR) damper for shock and vibration mitigation for high piston velocity (15 mph or 6.75 m/s) as well as an evaluation of its performance at low speed. Based on a Bingham-plastic (BP) model, as well as a BP model coupled with a low speed hysteresis model, two theoretical MR damper models for flow-mode MR dampers are constructed. Using the design strategy associated with the Bingham-model based damper model, two MR damper designs for achieving the performance requirement with a limited space are considered: first, the conventional MR damper that has an MR valve inside the piston head and second, the bifold MR damper that has MR valves at each end of the damper. After numerically comparing the damping performances of the two MR damper designs, the bifold MR damper has been chosen because its dynamic range is better at high speed. The bifold MR damper was tested at a relatively low piston velocity using an MTS testing machine under sinusoidal loading. Experimental data compare well with the results predicted by the theoretical models.

Key Words: magnetorheological • semi-active • impact damper • damping • damper • MR damper • Bingham number • Bingham plastic.

Journal of Intelligent Material Systems and Structures, Vol. 18, No. 12, 1227-1232 (2007)
DOI: 10.1177/1045389X07083131


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