メタマテリアルと圧電素子を利用した自律制振技術の基礎的検討

抄録

The metamaterial in which mechanical resonators are periodically mounted on the host structure can reduce the ambient vibration caused on the host structure by creating a bandgap in the frequency response properties. However, as a side effect, the addition of the mechanical resonators results in unwanted resonances outside the bandgap. The resonances will pose a problem in practical application because the resonances may lead to a breakage of the host structure at unexpected frequencies. To address this issue, we propose an application of a piezoelectric material and a damping circuit to the metamaterials. We also derive a coupled equation for the complex system. The analysis showed that the resonance intensities are decreased by over 70 % thanks to the proposed technique. The analysis also showed that the use of the piezoelectric material and the damping circuit will not change the properties of the bandgap. The proposed technique can compensate the disadvantage of the metamaterial using the mechanical resonators.