Dissipative particle dynamics modeling of a mini-MR damper focus on magnetic fluid

Abstract

Mini-magneto rheological damper modeled by using dissipative particle dynamics method as molecular modeling technique and effects of agent magnetic fluid properties on damping force are investigated. To validate results of modeling with experimental data, modified Bouc-Wen model is used as computational strategy and no-slip condition on the solid surfaces implemented by utilizing bounce back boundary condition which shows good conformity. Results of molecular modeling indicate by increasing in number density and non-dimensional weight of magnetic particles, damping force has parabolic pattern so that first increases then decreases to a constant value; while, by increasing in diameter of magnetic particles damping force increases uniformly. Also, the effect of different magnetic field distributions with enhancement rates of 10%, 30% and 50% on quality and quantity of damping force and shear stress is investigated. Results show by using number density, non-dimensional weight and diameter of magnetic particles of 0.25, 0.6 and 0.55 μm, respectively, when magnetic field with power function pattern is utilized considered damping force of 10 N obtained in less damping time and electrical energy consumption; so, modeled damper is an optimal version of its experimental model.