ArticleMaterials (Basel, Switzerland)2026
A Hybrid Metamaterial for Broadband, High-Performance Sound Absorption via Helmholtz Resonators Incorporating Porous Media.
Article in Materials (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Finite-thickness acoustic absorbers often face a trade-off between low-frequency resonance and broadband dissipation. The porous material (PR) provides stable mid-to-high-frequency losses through viscous and thermal effects, whereas Helmholtz resonators (HRs) offer compact low-frequency resonance but usually operate over narrow bands. Accordingly, an HR-PR hybrid metamaterial absorber is developed by coupling a central air neck and a sealed back cavity with a surrounding porous layer described by the Johnson-Champoux-Allard (JCA) rigid-frame equivalent-fluid model. A surface impedance model is formulated for the HR branch, the PR branch, and their area-weighted parallel admittance and is validated against COMSOL 6.4 unit-cell simulations. Complex-frequency reflection zero-pole analysis separates the HR-dominated localized resonance from the broadband dissipative contribution of the porous branch. Nine-unit cells with different back-cavity volumes are then arranged into a 3 × 3 composite material to distribute the HR resonances across the target low-frequency range. Using a peak placement optimization strategy to identify a broad continuous absorption band satisfying a sound absorption coefficient (
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