关键词: 减振, 梁, 声子晶体, 振动带隙

Abstract: The flexural vibration behavior of elastic wave across periodic binary inconstant section beam is studied by using plane-wave expansion (PWE) method and finite element (FE) method. Elastic wave band gaps are found in band structures of this kind of beam calculated with PWE method. The frequency ranges of sharp drop in frequency response curve simulated with FE method show good agreement with the band gaps. Those conclusions are verified by vibration experiment of periodic binary inconstant section beam consists of Al and organic glass. The existence of band gaps in these periodic structures gives a new idea in flexural vibration isolation of beams.

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