【摘要】 为了研究多频带声学超构材料的透射性能，采用声学有限元方法(FEM)模拟不同长度的OE-CE(一端封闭一端连通)空心方管结构单元的声透射谱，分析讨论管长对透射谱的影响，设计出一种占空比较小的由不同长度OE-CE空心方管并联组合的多频带声学超构材料板。结果表明：嵌有9个空心方管声学超构材料的声透射曲线出现声透射阻带，随着空心方管的长度增加，透射阻带峰值和负等效质量密度频带向低频方向移动；透射阻带的个数与不同长度的空心方管数目有关，即2种不同长度的空心方管并联组合的声学超构材料板可以实现2个透射阻带，3种不同长度的则可以实现3个透射阻带；宽频带声学超构材料板则需要在较低频率区域增加对应长度的空心方管数目，在较高频率区域减小相邻空心方管的长度梯度。所提出的采用OE-CE结构单元构建的声学超构材料具有结构简单、响应频带低的优点，并在多个响应频带具有优异的声学透射阻带特性。更多还原

【Abstract】 In order to study the transmission properties of parallel acoustic metamaterial with multi band, the structure unit of the OE-CE(one end closed and the other connected)hollow square tube was simulated by the finite element method(FEM),and the influence of tube length on the transmission spectrum was discussed.Multi-band acoustic metamaterials plate with low duty cycle was designed by structural units of OE-CE hollow square tubes of different lengths in parallel.The results show that the acoustic transmission spectrum of acoustic metamaterials embedded with nine hollow square tubes has a stop-band.As the length of the hollow square tube increases, the peak of the stop band and frequency region of negative effective mass density would move to low frequency.It is found that the number of the stopbands is related to the number of hollow square tubes with different lengths, that is, two stopbands can be achieved by the acoustic metamaterials with parallel hollow square tubes of two different lengths, and three stopbands done by three different lengths.The broadband acoustic metamaterial needs to increase the number of the corresponding hollow square tubes in the lower frequency region, and reduce the length gradient of adjacent hollow square tubes in the higher frequency region.The OE-CE unit has the advantages of simple structure and low response frequency band, which exhibits an excellent transmission stopband property in multiple frequency bands.更多还原