Quasi-Steady Analysis of a Magnetorheological Dashpot Damper

Abstract

This paper addresses quasi-steady analysis of a magnetorheological (MR) dashpot damper. MR dashpot dampers show mixed fluid mode of flow and shear flows since a dashpot inside dampers works as a piston and a moving wall simultaneously. In this study, quasi-steady analysis of MR dashpot dampers has developed based on the utilization of the Bingham-plastic constitutive model to assess performance metrics such as damping capacity. For the mixed mode MR damper that is the sums of flow and shear flows, fluid velocity profile, shear stress profile, and damping coefficient are theoretically derived. In addition, the preyield thickness equation to characterize the relationship between the Bingham number and the preyield thickness is constructed. Through computer simulation, damping characteristics of the mixed mode MR dashpot damper are evaluated and compared with flow mode case.