Abstract
The need for energy-efficient vehicles and machines often drives performance design towards mass reduction, harming noise and vibration. Metamaterials are recently being studied as a possible solution to tackle this classical acoustic problem with reduced mass and promising attenuation, at least in narrow frequency bands. This work presents a solution based on variations of the so-called decorated membrane acoustic metamaterial (MAM) by assembling membranes of different shapes and sizes into a supercell. Tessellation concepts are used to ensure the geometric compatibility between each component and the periodicity of the supercell. Finite element models are derived to estimate unit cells’ sound transmission loss performance, experimentally validated on a transmission loss tube. Finally, full MAMs panels are conceived based on the validated models, showing an attenuation band formation around the membranes’ mass-dominated frequencies, thus realising a metamaterial that can outperform the mass law.
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