Abstract
A variable damper applying Magneto-Rheological (MR) Grease was designed and its performance was also investigated, and the dynamic characteristics of the model structure with MR Grease damper were measured. MR fluid is known as one of functional fluids, whose rheological properties can be controlled by the applied magnetic field strength. MR damper has attracted much attention as the semi-active control device. MR fluid is composed of micron-sized magnetic particles and a carrier oil such as mineral oil or silicon oil. But the particles dispersed in the fluid would precipitate and make sedimentation due to the difference of density. In order to reduce or avoid the sedimentation of the magnetic particles in MR fluid, grease was introduced instead of base oil and MR grease was developed. In this paper, MR grease was adapted to a cylindrical damper, and its properties were investigated. Furthermore, the frequency responses of the model structure equipped with MR Grease damper were measured.
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