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声子晶体是一种具有声波带隙特性的新型功能材料。运用平面波展开法研究了二维声子晶体的带结构,二维声子晶体由横截面为正方形的散射体按正方形排列植入环氧树脂基体中形成。结果表明:通过改变散射体的取向可以调节系统的带隙,当填充率较低时,带隙宽度随散射体旋转角的增加先减小再增加,而填充率较高时,带隙宽度随散射体旋转角的增加而先稍有增加然后再减小。
Phononic crystals are a new type of functional material with acoustic bandgap properties. The band structures of two-dimensional phononic crystals are studied by the plane wave expansion method. The two-dimensional phononic crystals are formed by arranging square scatterers with square cross-section into the matrix of epoxy resin. The results show that the bandgap of the system can be adjusted by changing the orientation of the scatterer. When the filling rate is low, the band gap width first decreases and then increases with the increase of the rotation angle of the scatterer. When the filling rate is high, Scatter rotation angle increases first and then slightly increased.