Reduction in Horizontal and Vertical Vibrations by Dynamic Absorber Using Elliptical Shaped Magneto-Rheological Elastomer

抄録

We propose a broadband frequency-tunable dynamic vibration absorber to mitigate vibrations along the horizontal and vertical directions of a vibrating object. The absorber is based on the primary design principle of mass dampers. A magnetorheological elastomer that changes its relative stiffness according to an external magnetic field controls the natural frequency of the movable mass in the absorber. A coil generates the magnetic field and also serves as the movable mass to decrease the total absorber weight while generating a closed-loop magnetic force. Furthermore, an elliptical magneto-rheological elastomer performs two-directional damping. Experimental results show that the natural frequency of the coil can be adjusted by the electric current applied to the coil along both the horizontal and vertical directions. Moreover, vibrations along the horizontal and vertical directions of the upper torque rod in a commercial vehicle can be mitigated by applying an appropriate current to the coil.