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采用三维集中质量法计算简单立方声子晶体结构,通过ANSYS软件进行建模及网格划分,并导入Matlab软件进行数值计算,得到以铝为基体的三维四元声子晶体能带图.通过单一改变各组元的密度,考察对应变化对第一带隙的影响.结果表明:此结构在低频率段内存在一定宽度的带隙,且材料密度改变对第一带隙的带隙位置和宽度产生较大影响;改变某些材料密度,可以设计在一定频率段带隙的减振体结构,从而抑制带隙频率范围内的有害振动,达到减振效果.
The three-dimensional lumped mass method was used to calculate the structure of simple cubic phononic crystals, and the model was established by ANSYS software and meshed, and Matlab software was used for numerical calculation to get the energy band diagram of aluminum with three-dimensional quaternary phonon crystals. The influence of corresponding changes on the first bandgap was investigated.The results show that there is a bandgap with a certain width in the low frequency band and the effect of material density on the bandgap position and width of the first bandgap Which has a great impact. To change the density of some materials, the structure of the vibration damping body at a certain frequency band gap can be designed so as to suppress the harmful vibration in the band gap frequency range and achieve the vibration damping effect.