EXTRAORDINARY ACOUSTIC ABSORPTION INDUCED BY HYBRID RESONANCE AND ELECTRICAL ENERGY GENERATION FROM SOUND BY HYBRID RESONANT METASURFACE

摘要

A sound absorbing metamaterial comprises an acoustic impedance-matched surface configured to minimize reflection from an incident acoustic wave. The surface is comprised of an elastic or flexible membrane and a substantially rigid mass mounted on the membrane. A relatively solid surface is provided as a reflective surface and is positioned behind the membrane. The reflective surface is separated by a predetermined distance from the elastic or flexible membrane and forms a fluid space between the membrane and the solid surface. The mass mounted on the membrane, in combination with the elastic membrane establish a plurality of eigenfrequencies.

主权项

1. A sound absorbing metamaterial comprising
an acoustic impedance-matched surface configured to minimize reflection from an incident acoustic wave, the surface comprising: an elastic or flexible membrane; a relatively solid surface provided as a reflective surface and positioned behind the membrane and separated by a predetermined distance from the elastic or flexible membrane and forming a fluid space between the membrane and the solid surface; and a substantially rigid mass mounted on the membrane, whereby the elastic membrane with the mass establish a plurality of eigenfrequencies for resonance.