论文期刊

Ultrathin lightweight plate-type acoustic metamaterials with positive lumped coupling resonant




作者: Fuyin Ma, Meng Huang, and Jiu Hui Wu
发表/完成日期: 2017-01-04
期刊名称: Journal of Applied Physics
期卷: Vol.121, No.1
相关文章: Ultrathin lightweight plate-type acoustic metamaterials with positive lumped coupling resonant.pdf   
论文简介
The experimental realization and theoretical understanding of a two-dimensional multiple cells
lumped ultrathin lightweight plate-type acoustic metamaterials structures have been presented,
wherein broadband excellent sound attenuation ability at low frequencies is realized by employing
a lumped element coupling resonant effect. The basic unit cell of the metamaterials consists of an
ultrathin stiff nylon plate clamped by two elastic ethylene-vinyl acetate copolymer or acrylonitrile
butadiene styrene frames. The strong sound attenuation (up to nearly 99%) at low frequencies is
experimentally revealed by the precisely designed metamaterials, for which the physical mechanism
of the sound attenuation could be explicitly understood using the finite element simulations.
As to the designed samples, the lumped effect from the frame compliance leads to a coupling flexural
resonance at designable low frequencies. As a result, the whole composite structure become
strongly anti-resonant with the incident sound waves, followed by a higher sound attenuation, i.e.,
the lumped resonant effect has been effectively reversed to be positive from negative for sound
attenuation, and the acoustic metamaterial design could be extended to the lumped element containing
multiple cells, rather than confined to a single cell.