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Articoli Scientifici

2026-online first

The acoustical design and modelling of a subwavelength hexag-onal acoustic metamaterial for multipurpose use and potential building applications

DOI
https://doi.org/10.3280/ria2026oa22128
Inviata
25 febbraio 2026
Pubblicato
13-05-2026

Abstract

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.

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