631 磁気粘弾性エラストマを用いた可変剛性型動吸振器の開発

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  • 631 Development of a dynamic vibration absorber with variable stiffness property using Magneto-rheological Elastomer

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Dynamic Vibration Absorber (DVA) is well known as one of the representatives of vibration suppression systems. DVA is classified to be passive system and has the advantage that it is reliable and inexpensive, but does not work effectively beyond the designed range. To solve this problem, Magneto-rheological elastomers (MREs) are adopted to DVA to make DVA with variable stiffness. MREs are one of smart materials whose rheological or viscoelastic properties can be varied by applying external magnetic field. In this paper, the stiffness controllable elastomer composites known as MREs are first fabricated and their field- dependent static and dynamic properties are tested as the basis of this study. The MRE is then applied to DVA to control the vibration of one-degree of freedom structure model. Experimental investigations show that the vibration of the one-degree of freedom structure that is exposed to base excitation can be effectively reduced by actuating DVA with variable stiffness.

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