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FrancoAngeli Journals

Articoli Scientifici

V. 50 N. 1 (2026)

Una Barriera acustica a Cristalli Sonici a doppio regime basata su di-spersori asimmetrici multirisonanti

DOI
https://doi.org/10.3280/ria2026oa22146
Inviata
27 febbraio 2026
Pubblicato
29-06-2026

Abstract

Le barriere antirumore a Cristalli Sonici (SCNB) basate su Cristalli Sonici (SC) con risonatori di Helmholtz (HR) permettono di ottenere bande di isolamento aggiuntive rispetto ai soli bandgap di Bragg (Bragg-BG). Tuttavia, l’introduzione di HR non garantisce sempre un incremento dell’attenuazione. L’interazione tra Bragg-BG e bandgap da risonanza locale (HR-BG) dipende in modo critico dal rapporto tra la frequenza di risonanza locale e la frequenza di Bragg (fHR rispetto a fBragg) e dall’allineamento dei colli dei risonatori rispetto all’onda incidente (0° e 90°). In questo lavoro si propone una SCNB a doppio regime basata su dispersori asimmetrici multirisonanti, che integrano due HR ortogonali con cavità accoppiate. La risposta è studiata mediante modelli FEM 2D sia in configurazione periodica (diagramma di banda) sia in configurazione finita (trasmissione), con particolare attenzione all’Insertion Loss (IL) nell’intervallo 500–2500 Hz. Poiché la sintonizzazione analitica è limitata dalla geometria irregolare delle cavità, l’ottimizzazione multiobiettivo regola i parametri geometrici per collocare e rendere complementari le bande di attenuazione nelle due orientazioni. La validazione sperimentale su prototipo stampato in 3D, mediante misure in camera anecoica con scansione robotizzata del campo acustico, conferma l’aumento di IL e il comportamento a doppio regime ottenuto mediante rotazione dei dispersori.

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