Broadband low-frequency sound absorption via a hexagonal acoustic metamaterial in the honeycomb structure

I constructed two models for achieving a perfect absorption acoustic metamaterial using a hexagonal honeycomb structure in the air with a change in folding number. The purpose of these models was to construct a hexagonal honeycomb metamaterial derived from Polydimethylsiloxane (PDMS) polymer. I carried out finite element simulations using COMSOL Multiphysics software to take theoretical measurements for our honeycomb structure and to show the influence of structural parameters in our models. Our simulations revealed that, depending upon the theoretical analysis, an acoustic metamaterial that supports resonance at 210 Hz for folding number n = 6 can be developed to construct a low-frequency sound-absorbing technology. I demonstrate that the dissipative loss effect can be controlled by folding number and high space utilization through adjusting the hexagonal dimensions to achieve perfect absorption. I also demonstrate the important effects of folding number, rotation angle, and structural parameters on improving acoustic absorption performance for honeycomb structural design. The results are of extraordinary correspondence at low frequency for achieving an ideal sound absorbing material.