%0 Journal Article
%T Plate-Type Acoustic Metamaterials: Experimental Evaluation of a Modular Large-Scale Design for Low-Frequency Noise Control
%A Heow Pueh Lee
%A Linus Yinn Leng Ang
%A Yong Khiang Koh
%J -
%D 2019
%R https://doi.org/10.3390/acoustics1020019
%X Abstract For industrial applications, the scalability of a finalised design is an important factor to consider. The scaling process of typical membrane-type acoustic metamaterials may pose manufacturing challenges such as stress uniformity of the membrane and spatial consistency of the platelet. These challenges could be addressed by plate-type acoustic metamaterials with an internal tonraum resonator. By adopting the concept of modularity in a large-scale design (or meta-panel), the acoustical performance of different specimen configurations could be scaled and modularly combined. This study justifies the viability of two meta-panel configurations for low-frequency (80¨C500 Hz) noise control. The meta-panels were shown to be superior to two commercially available noise barriers at 80¨C500 Hz. This superiority was substantiated when the sound transmission class (STC) and the outdoor-indoor transmission class (OITC) were compared. The meta-panels were also shown to provide an average noise reduction of 22.7¨C27.4 dB at 80¨C400 Hz when evaluated in different noise environments¡ªtraffic noise, aircraft flyby noise, and construction noise. Consequently, the meta-panel may be further developed and optimised to obtain a design that is lightweight and yet has good acoustical performance at below 500 Hz, which is the frequency content of most problematic noises. View Full-Tex
%K large-scale
%K plate-type acoustic metamaterial
%K resonator
%K modular
%K noise control
%K sound transmission loss
%K noise reduction
%K environmental noise
%U https://www.mdpi.com/2624-599X/1/2/19