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Omnidirectional acoustic absorber with a porous core and a metamaterial matching layer

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Figure

FIG. 1. Cross section of the OA. (a) Full core structure, (b) hollow corestructure. 1—air, 2—matching metamaterial layer, 3—porous absorber.
FIG. 2. Characteristic impedance (a) and wavenumber (b) of the mineral wool. Solid line: data, dashed line: equivalent fluid model.
FIG. 3. (a) Continuous profile of the filling fraction in the matching layer (Eq. (9)Table) and its approximation
FIG. 4. Angular distribution of normalised rms“approximate” matching layer profile (Table pressure on the surface
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