The acoustical design and modelling of a subwavelength hexagonal acoustic metamaterial for multipurpose use and potential building applications1

Titolo Rivista RIVISTA ITALIANA DI ACUSTICA
Autori/Curatori Denilson Ramosa, Francesco Pompoli, Luís Godinho, Paulo Amado-Mendes, Paulo Mareze
Pubblicazione Online First 08/05/2026 Fascicolo 2026/Online First
Lingua Inglese Numero pagine 14 P. 1-14 Dimensione file 2939 KB
DOI 10.3280/ria2026oa22128
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The development and application of noise control strategies on subwavelength regimes have thus demanded a continuous effort by several researchers. In recent decades, the advent of acoustic metamaterials arose as a novel strategy on the sound wave manipulation and the development of subwavelength dimensions acoustic devices. In previous works by the authors, analytical approaches were developed to provide a more comprehensive acoustic characterization of the proposed metamaterial through equivalent fluid models. In contrast, the present work aims to advance the concept by introducing the design of a ventilated subwavelength acoustic metamaterial and by examining its potential applicability across multiple building-related contexts, including sound absorption and sound transmission control. By means of optimized geometrical configurations, it is possible to achieve quasi-perfect sound absorption (α > 0.8[-]) or enhanced sound transmission loss efficiency (> 30 [dB]) within subwavelength regimes. The results demonstrate that the proposed acoustic metamaterial operates effectively at subwavelength dimensions and within selectively tuned attenuation frequency bands, enabling single-, dual-, triple-, or hexa-resonance configurations. These features introduce additional degrees of freedom into the overall design concept, offering promising applications across various engineering fields, particularly in building acoustics.

Lo sviluppo e l’applicazione di strategie per il controllo del rumore in regimi sub-lunghezza d’onda (subwavelength) hanno richiesto un impegno costante da parte di numerosi ricercatori. In questo contesto, l’avvento dei metamateriali acustici si è presentato come una strategia innovativa per la manipolazione delle onde sonore e per lo sviluppo di dispositivi acustici dalle dimensioni estremamente ridotte. In studi precedenti dei autori, sono stati sviluppati approcci analitici per fornire una caratterizzazione acustica più completa del metamateriale proposto attraverso modelli di fluido equivalente. In questo lavoro, l’obiettivo è quello di far progredire il concetto introducendo la progettazione di un metamateriale acustico ventilato sub-lunghezza d’onda ed esaminandone la potenziale applicabilità in molteplici contesti edilizi, tra cui l’assorbimento acustico e il controllo della trasmissione del suono. Attraverso configurazioni geometriche ottimizzate, è possibile ottenere un assorbimento sonoro quasi perfetto (α > 0.8[-]) o un’efficienza superiore nella perdita di trasmissione sonora (> 30 [dB]) entro regimi sub-lunghezza d’onda. I risultati dimostrano che il metamateriale acustico proposto opera efficacemente a dimensioni ridotte e all’interno di bande di frequenza di attenuazione sintonizzate selettivamente, consentendo configurazioni a singola, doppia, tripla o esa-risonanza. Queste caratteristiche introducono ulteriori gradi di libertà nel concetto di design complessivo, offrendo applicazioni promettenti in vari settori dell’ingegneria, in particolare nell’acustica edilizia.

Parole chiave:materiale acustico, risonatori di Helmholtz, assorbimento sonoro, perdita di trasmissione sonora, acustica edilizia

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Denilson Ramosa, Francesco Pompoli, Luís Godinho, Paulo Amado-Mendes, Paulo Mareze, The acoustical design and modelling of a subwavelength hexagonal acoustic metamaterial for multipurpose use and potential building applications1 in "RIVISTA ITALIANA DI ACUSTICA" Online First/2026, pp 1-14, DOI: 10.3280/ria2026oa22128