楕円型磁気応答性材料を用いた自動車の内燃機関振動の前後・上下方向振動制御

抄録

A broad-band frequency tunable dynamic vibration absorber was designed and fabricated based on the primary design principle of a mass damper. A magneto-rheological elastomer (MRE) that can change the relative stiffness when an external magnetic field is applied was used to control the natural frequency of the movable mass of the absorber. A coil to generate the magnetic field was also used as a movable mass to decrease the total weight and to create a constant closed loop of the magnetic force. For the purpose of further improving of the absorber to reduce the vibration effectively, the absorber that can reduce the vibration both in the lateral and vertical direction of the vibrating objective was studied. As a result of changing the shape of MRE used in the previous absorber from a circular shape one to an elliptical shape one, the vibration in both the lateral and vertical direction of the vibrating objective could be reduced with applying the optimum current to the coil.