Fig. 14: The structures based on membrane resonance for ventilated sound insulation.
From: Resonance-based acoustic ventilated metamaterials for sound insulation
a schematic diagram of the open membrane metamaterial, along with sound transmission loss and transmission coefficient spectra. Reproduced with permission from ref. 61. b Metamaterial consists of an array of four tunable membrane resonators and transmission loss spectra. Reproduced with permission from ref. 157.
