Extending and lowing band gaps in one-dimensional phononic crystal strip with pillars and holes
作者： Chunyang Ma , Jianwen Guo , Yongfu Liu
DOI: 10.1016/J.JPCS.2015.07.008
关键词:
摘要: Abstract Effectiveness of extending and lowing gaps in one-dimensional phononic crystal strips is conducted by periodically patterning pillar-type strip with holes. Finite element method applied to the hybrid unit calculate band structures eigen modes. Transmission spectra displacement fields are investigated confirm gap effect studied strips. Numerical results show that, can open lower wider gaps. Compared two-dimensional plate, different group velocities frequencies low-order bands, modes edge because boundary condition difference. The effectiveness modulating width investigated. Gap degeneration happens adjust downward. Besides, structure double-side pillar leads more resonance bands than that single-side pillar. Vibration mode pure type located structure, some hole-type reserved structure. Resonance introduced vibration double-pillar character, create flat bands. Furthermore, sensitivity geometrical parameters pillars holes also
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