Abstract
In recent years, the material which has negative mass characteristics, called meta-material, attracts attention. Mast studies of the meta material have focused on the applications using the characteristic. This report is an attempt to make clear the fundamental vibration characteristic of the meta material. The free vibration of the one degree of freedom system with a negative mass are analyzied. The effects of the negative mass upon the nutural frequency are examined. It is shown that a free vibration solution may became unstable. The condition of stiffness and damping to make the free vibration solution stable is discussed.
