Vibration control device having variable moment of inertia by MR fluid inside a flywheel

(In case of 8 electromagnetic poles)

Abstract

An inertia effect, which is proportional to acceleration and mass as a negative force, keeps own situation of a body during movement under the inertia low. Recently some researcher focused on the inertia effect to control vibration. In previous paper the authors developed a vibration control device which is having variable moment of inertia by MagnetoRheological fluid inside a flywheel. Ferrite particles of the MR fluid are clustered when magnetic field is applied by 4 electromagnets to the flywheel. Then the radius of gyration of the flywheel, which depends on the moment of inertia, is changed, the vibration control device can have a variable moment of inertia. It was clear that the inertia mass effect was varied as higher current, and vibration control for the earthquakes was confirmed numerically and experimentally. In this paper the vibration control device using 8 electromagnets is updated from the prototype in order to get more inertia effect stably. Magnetic field in case of 8 electromagnetic poles was analyzed by FEM, and resisting force characteristics of the new device were investigated.