Sound Transmission Loss of Locally Resonant Metamaterial and Phononic Crystal Plates

This paper investigates the sound transmission loss of locally resonant metamaterial and phononic crystal plates using unit cell and finite plate analysis. Plates with flexural wave stop bands can lead to enhanced vibro-acoustic performance. The acoustic insulation performance and frequency range depends, however, on the underlying stop band mechanism. While unit cell analysis suggests sound transmission loss improvements regardless of the mechanism, the vibro-acoustic performance of their finite plate counterparts can differ significantly.