关键词: 声子晶体　弹性波带隙　振动带隙　隔振

Abstract: By analyzing the vibration band structure of infinite periodic mass-spring structure, it is discovered that the structure have vibration band gaps which are similar with elastic band structure of phononic crystals, and the vibration of such frequencies within band gaps can not be transmitted. Numerical calculation method is applied to calculate the frequency response curve of finite periodic structure. The influences of periodicity of mass-spring, material damping and the characteristics of vibration isolation are discussed by using numerical calculation method. Those conclusions come from numerical calculation are examined by vibration experiment of two mass periodic mass-spring structures, which results in reasonable agreements.

Key words: Elastic band gap, Phononic crystals, Vibration band gap, Vibration isolation