Acoustic transmission loss in Hilbert fractal metamaterials

被引：7
作者：
Comandini G. [1 ,2 ]
Ouisse M. [2 ]
Ting V.P. [1 ,3 ]
Scarpa F. [1 ]
机构：
[1] Bristol Composite Institute (BCI), School of Civil, Aerospace and Mechanical Engineering (CAME), University of Bristol, Bristol
[2] SUPMICROTECH, Université de Franche-Comté, CNRS, Institut FEMTO-ST, Besançon
[3] Research School of Chemistry, Australian National University, Canberra, 2601, ACT
来源：
Scientific Reports | / 13卷 / 1期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1038/s41598-023-43646-1
中图分类号：
学科分类号：
摘要：
Acoustic metamaterials are increasingly being considered as a viable technology for sound insulation. Fractal patterns constitute a potentially groundbreaking architecture for acoustic metamaterials. We describe in this work the behaviour of the transmission loss of Hilbert fractal metamaterials used for sound control purposes. The transmission loss of 3D printed metamaterials with Hilbert fractal patterns related to configurations from the zeroth to the fourth order is investigated here using impedance tube tests and Finite Element models. We evaluate, in particular, the impact of the equivalent porosity and the relative size of the cavity of the fractal pattern versus the overall dimensions of the metamaterial unit. We also provide an analytical formulation that relates the acoustic cavity resonances in the fractal patterns and the frequencies associated with the maxima of the transmission losses, providing opportunities to tune the sound insulation properties through control of the fractal architecture. © 2023, The Author(s).
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