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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: Phononic crystals Beam Elastic band gap Vibration
isolation
CLC No: O321
TH113 O48
国家973重大基础研究资助项目(51307).
Received 20040628, received in revised form 20041110
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