A study on the optimized area ratio of unit cell assembly for the broadband perfect sound absorption of acoustic metasurface

抄録

An acoustic metasurface (AMS) can provide high broadband sound absorption realized by planar periodic array assembly of small Helmholtz resonators tuned at different resonant frequencies. The formulation for the sound absorption coefficient of the AMS developed in a previous study provides a uniform and nearly perfect sound absorption in the one octave band. Numerical case studies suggest that the area ratio of the unit cell assembly for the broadband perfect sound absorption of the AMS can be formulated as a power function of frequency ratio to the center frequency and that the formulation will be identical for any center frequency.