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采用时域有限差分法,分析了声波在二维四方排列半圆铝管/空气组合声子晶体中的禁带特性.通过对半圆铝管壁厚、旋转角度的计算,得到了比整圆铝管结构具有更宽完全禁带的半圆铝管结构,并利用实验测试验证了理论分析的正确性.分析了不同凹形截面散射体沿ΓX方向的禁带特性,指出了半圆管形散射体在实现最大禁带宽度方面的优越性.
The time-domain finite difference method is used to analyze the band gap characteristics of acoustic wave in a two-dimensional square arrangement of semicircular aluminum tube / air combination phononic crystals.By calculating the wall thickness and rotation angle of semi-circular aluminum tube, Structure with a wider band gap semi-circular aluminum tube structure, and the use of experimental tests verify the correctness of the theoretical analysis of the different concave cross-section of the ΓX band gap characteristics of the beam, pointed out that the semicircular tube scatterer in the realization of The advantages of the maximum forbidden band width.