Controlling sound with acoustic metamaterials

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How to See Hidden Patterns in Metamaterials with Interpretable Machine Learning (2021, background): “or stiffness [13, 15]) has been experimentally observed at different scales, which has prompted engineers to explore their use in different applications, ranging from materials for advanced batteries [62], to energy harvesting [12], seismic protection [7, 26, 46, 47], vibration or sound insulation [”
Extreme low-frequency ultrathin acoustic absorbing metasurface (2019, background): “Due to the weak intrinsic dissipation of conventional materials in the low-frequency region, the perfect absorption of sound at low frequency (<100Hz) is still a scientific challenge [1].”
Active times for acoustic metamaterials (2019, background): “factor resonances, in practical applications is visco-thermal losses [19,125,126].”
Microlattice Metamaterials for Tailoring Ultrasonic Transmission with Elastoacoustic Hybridization (2016, background): “However, many metamaterials have been presented as proof-of-principle demonstrations on macroscopic scales [22,23,27] creating the need for microscale tailorable solutions that can function in the megahertz-frequency regime, of interest to biomedical applications.”