Manipulating sonic band gaps at will: vibrational density of states in three-dimensional acoustic metamaterial composites
Manipulating sonic band gaps at will: vibrational density of states in three-dimensional acoustic metamaterial composites
复制标题
DOI：
10.1080/17455030.2017.1340689
复制
发表时间：
2018-04
影响因子：
--
通讯作者：
T. Terao
中科院分区：
文献类型：
--
作者：
T. Terao
摘要对嵌入固体基体中的质量-质量微结构弹性复合材料的振动特性进行了数值研究。利用晶格模型，我们研究了共振粒子随机分散的三维复合结构中态的振动密度。通过在系统中分散这些粒子，就会出现声波带隙。通过改变共振粒子的参数，可以将带隙引入所需的频率范围，并且可以通过改变要分散的共振粒子的浓度来控制带隙的频率宽度。此外，使用不同种类的共振粒子可以实现多个声波带隙。这些结果使我们能够提出一种替代方法来制造可以使用声学超材料抑制特定频率弹性波传播的设备。
Abstract Vibrational properties of elastic composites containing a mass-in-mass microstructure embedded in a solid matrix are numerically studied. Using a lattice model, we investigate the vibrational density of states in three-dimensional composite structures where resonant particles are randomly dispersed. By dispersing such particles in the system, a sonic band gap appears. It is confirmed that this band gap can be introduced in a desired frequency regime by changing the parameters of resonant particles and the frequency width of this band gap can be controlled by varying the concentration of the resonant particles to be dispersed. In addition, multiple sonic band gaps can be realized using different species of resonant particles. These results enable us to suggest an alternative method to fabricate devices that can inhibit the propagation of elastic waves with specific frequencies using acoustic metamaterials.