メタマテリアルの原理の固体波への適用に関する基礎的研究

（メタマテリアル化条件の緩和について）

抄録

This paper shows a fundamental study to apply the principle of metamaterial to solid waves of 2D/3D structures. A method of making the effective mass negative and an effect of the negative mass for a lumped parameter system in which the governing equation is isomorphic to the central difference approximation formula of the wave equation are investigated from the viewpoint of damping / vibration isolation. The results are as follows: 1) The effective mass can be negative by adding the dynamic damper-like systems in two-dimensional and three-dimensional structures. 2) It is important to make all natural frequencies of the one-degree-of-freedom system consisting of the mass of the main system and springs of the additional structures the same and to make all natural frequencies of the additional structures the same.