Abstract
Magnetorheological fluids(MRF) behave like a Bingham fluid having yield stress which can be rapidly changed in a reversible manner by applying magnetic field, and are anticipated some applications of industrial devices such as damper, a clutch, a brake, and so on. In these applications, one of serious problems is the sedimentation of dispersed particles in the MR fluid in an off-working state. In this research, for the purpose of preventing the particles from settling, an MR fluid composite made of a sponge containing the MR suspension and an MR rubber composite made of the silicone rubber containing ferro-magnetic particles have been developed, and their rheological properties in oscillatory shear mode have been investigated. In addition, a wire tension control system for coil winding using MR sponge composite brake and a damping force-variable damper using the MR sponge composite have been developed, and their performance characteristics have been evaluated.
