Study on Performance Comparison of MR Damper for Fluid Properties and Orifice Shapes

Abstract MR(Magneto-Rheological) damper generates the magnetic shear force due to the cohesiveness of MR fluid influenced by a magnetic field. MR fluid consists of magnetic particles and a base liquid. In the present study, the damping forces of MR damper were investigated for density 1.3, 1.5 and 1.7 g/ , and viscosity 1000 and 10000cp, and for the change of orifice shapes. It was found that the increase in the density and viscosity of MR fluid could change the damping force of MR damper due to the magnetic effects. Also, the damping forces on orifice shapes increased as the orifice gap and length decreased. These results showed that the properties of MR fluid and orifice shapes were important for the optimum design of MR damper. Key Words : Damping force, Density, MR damper, MR fluid, Orifice, Viscosity W?ÐO £c ] ³ £  D£ Oi ‹UV DÐ ]£A‰ ‡{AEG ¯pz . * Corresponding Author : Seok-Hyun Lee(Sunmoon Univ.)Tel: +82-10-7343-1868 email: noguleekill@naver.comReceived October 31, 2013 Revised (1st November 25, 2013, 2nd November 26, 2013) Accepted March 6, 2014