2017/12/17 by Anastasiia O. Krushynska, Krushynska, Anastasiia O., Federico Bosia +3
Engineering · Health Professions · Materials Science · #Acoustic Wave Phenomena Research #Applied Physics (physics.app-ph) #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Metamaterials and Metasurfaces Applications #Noise Effects and Management
paper · pdf · doi:10.48550/arxiv.1712.06063
openalex publication_date 2017/12/17 · openalex created_date 2022/10/02 · openalex updated_date 2026/07/28
We numerically analyze the performance of labyrinthine acoustic metamaterials\nwith internal channels folded along a Wunderlich space-filling curve to control\nlow-frequency sound in air. In contrast to previous studies, we perform direct\nmodeling of wave propagation through folded channels, not introducing effective\ntheory assumptions. As a result, we reveal that metastructures with channels,\nwhich allow wave propagation in the opposite direction to incident waves, have\ndifferent dynamics as compared to those for straight slits of equivalent\nlength. The differences are attributed to activated tortuosity effects and\nresult in 100% wave reflection at band gap frequencies. This total reflection\nphenomenon is found to be insensitive to thermo-viscous dissipation in air. For\nlabyrinthine channels generated by iteration levels, one can achieve broadband\ntotal sound reflection by using a metamaterial monolayer and efficiently\ncontrol the amount of absorbed wave energy by tuning the channel width. Thus,\nthe work contributes to a better understanding of labyrinthine metamaterials\nwith potential applications for reflection and filtering of low-frequency\nairborne sound.\n