周期構造を用いたバンドギャップ生成に関する基礎的研究

抄録

This paper is a fundamental study of band gap generation by periodic structures.The relationship between the period and boundary conditions of the structure and the band gap produced was investigated for longitudinal waves in bars.The results are summarised as follows: 1)It is shown that the mechanism of band gap generation in the circular case is the separation of cos and sin modes. 2)It is shown that when the period of the structure is short, the mechanism of band gap generation in the finite-length and cyclic cases is almost the same.