Exploring Herschel-Quincke Ducts for Enhanced Sound Attenuation: An Investigation into Acoustic Metamaterial Systems

Resumo

This present study evaluates the effectiveness of a periodic acoustic metamaterial system comprised of Herschel-Quincke (H-Q) ducts for noise control. The methodology employed is based on a transfer matrix (TM) approach. The results regarding sound transmission loss are validated through finite element simulations carried out in the COMSOL Multiphysics software. Furthermore, the Floquet-Bloch theory is utilized to identify bandgaps in infinite periodic silencers, highlighting the frequency ranges where sound waves are significantly attenuated. Additionally, several Herschel-Quincke tube models are proposed, incorporating variations in the number and shape of H-Q tubes. This results in the definition of structural parameters that exhibit substantial improvements in their sound attenuation capabilities, particularly in expanding the frequency range where attenuation occurs.