Dissipative particle dynamics modeling of MR fluid flow in a novel magnetically optimized mini-MR damper

Abstract

Magnetically optimization of mini-MR damper with focused on MR fluid properties and damper construction is investigated using dissipative particle dynamics method as a molecular scale modeling technique. To select a suitable MR fluid, the effect of diameter and weight of magnetic particles on damping force of 10 N as set point is studied. The results show damping force increases by increasing diameter of magnetic particles and finally trends to a constant value while changes nonparabolic by enhancement of their weight. The results of studies on structural parameters of damper show that by increasing gap size of flow passage, damping force increases while enhancement in inner diameter of cylinder and piston length has reverse effect. Optimum design of MR damper completed by investigation on electrical coils in terms of their arrangement and step wise distribution of magnetic field strength as our major innovation. To optimum operating conditions of MR damper at minimum electrical energy consumption and hysteresis level, the scenario of three segment coils in length of 3, 5, and 7 mm at base relative magnetic strength of 40% with 15% difference in steps by utilizing 140CG MR fluid as agent fluid are selected.