固-流结构声子晶体中弹性波能带的色散研究

推导出弹性波斜入射固-流结构声子晶体的转移矩阵和色散公式.利用色散公式研究了弹性波在固-流结构声子晶体中的能带特性.结果表明,介质厚度固定时,弹性波中会出现多级禁带,禁带的频率中心随入射角的增加而向高频方向移动,入射角增加到一定值后会分裂出新的禁带,分裂出的禁带频率宽度随级数的增加而增大.入射角固定时,禁带的频率宽度随介质厚度近似成反比变化,分裂出的禁带频率宽度随介质厚度的增加而减小.

Dispersive Study on the Photonic Bandgap of Solid and Fluid Phononic Crystal

The transfer matrix and dispersive formula of the phononic crystal are inferred.Using the dispersive formula,the photonic bandgap characteristic of elastic wave in the 1-D phononic crystal is calculated.When a certain the medium thickness,there are a number of the forbidden band in the elastic wave,the center frequency of the forbidden band increased with the incidence angle incresing.The forbidden band split when the incidence angle up to a certain value,the width of splited forbidden band increases when t...