论文期刊

A lightweight low-frequency sound insulation membrane-type acoustic metamaterial




作者: Kuan Lu, Jiu Hui Wu, Dong Guan, Nansha Gao, and Li Jing
发表/完成日期: 2016-02-18
期刊名称: AIP Advances
期卷: Vol. 6
相关文章: A lightweight low-frequency sound insulation membrane-type acoustic metamaterial.pdf   
论文简介
A novel membrane-type acoustic metamaterial with a high sound transmission loss (STL) at low frequencies (<=500Hz) was designed and the mechanisms were investigated by using negative mass density theory. This metamaterial’s structure is like a
sandwich with a thin (thickness=0.25mm) lightweight flexible rubber material within
two layers of honeycomb cell plates. Negative mass density was demonstrated at
frequencies below the first natural frequency, which results in the excellent lowfrequency
sound insulation. The effects of different structural parameters of the membrane
on the sound-proofed performance at low frequencies were investigated by
using finite element method (FEM). The numerical results show that, the STL can be
modulated to higher value by changing the structural parameters, such as the membrane surface density, the unite cell film shape, and the membrane tension. The acoustic metamaterial proposed in this study could provide a potential application in the
low-frequency noise insulation.