Semi-active vibration suppression using skyhook-based control by a shear-type MR grease damper

抄録

In this paper, the performance of semi-active vibration suppression by a shear-type MR grease damper is experimentally investigated. The shear-type damper using magnetorheological grease (shear-type MR grease damper) is one of MR dampers that are widely studied as promising devices for semi-active vibration suppression. It was developed to overcome the two issues in conventional pressure-type MR fluid dampers; the low dispersion stability and the low dynamic range were solved by applying MR grease and shear-type damper, respectively. The high dynamic range would contribute to the high performance of semi-active vibration suppression since it varies the damping properties significantly according to the vibration state. To suppress vibration with a semi-actively controlled current, it is necessary to propose a control strategy that takes full advantage of the high dynamic range. In this study, in order to achieve the high suppression performance over a wide frequency range, a control law called skyhook-based control is proposed to reduce the vibration response not only around the natural frequency but also in the high-frequency range. The results of the vibration suppression test using a small model structure show that the proposed skyhook-based control can reduce the vibration response most successfully of all the methods including the OFF-state, the ON-state, and the conventional semi-active controls such as the ON-OFF control and the conventional skyhook-based control.