论文期刊

Multi-cavity coupling acoustic metamaterials with low-frequency broad band gaps based on negative mass density




作者: Chuanhui Yang, Jiu Hui Wu, Songhua Cao, Jing Li
发表/完成日期: 2016-08-10
期刊名称: Modern Physics Letters B
期卷: Vol. 30, No. 22
相关文章: Multi-cavity coupling acoustic metamaterials with low-frequency broad band gaps based on negative mass density.pdf   
论文简介
This paper studies a novel kind of low-frequency broadband acoustic metamaterials with
small size based on the mechanisms of negative mass density and multi-cavity coupling.
The structure consists of a closed resonant cavity and an open resonant cavity, which
can be equivalent to a homogeneous medium with e ective negative mass density in a
certain frequency range by using the parameter inversion method. The negative mass
density makes the anti-resonance area increased, which results in broadened band gaps
greatly. Owing to the multi-cavity coupling mechanism, the local resonances of the lower
frequency mainly occur in the closed cavity, while the local resonances of the higher
frequency mainly in the open cavity. Upon the interaction between the negative mass
density and the multi-cavity coupling, there exists two broad band gaps in the range of
0{1800 Hz, i.e. the rst-order band gap from 195 Hz to 660 Hz with the bandwidth of
465 Hz and the second-order band gap from 1157 Hz to 1663 Hz with the bandwidth
of 506 Hz. The acoustic metamaterials with small size presented in this paper could
provide a new approach to reduce the low-frequency broadband noises.