Composite sound-absorbing metamaterials via multiple resonance coupling and quality factor modulation

Abstract

Broadband absorbers based on resonant acoustic metamaterials often require intricate designs, yet this complexity inherently restricts their bandwidth, robustness, and manufacturability. To overcome these constraints, we present a composite sound-absorbing metamaterial that combines multiple resonance coupling with quality factor modulation, leveraging micro-perforated plates and porous materials. This metamaterial exhibits near-perfect broadband sound absorption across a frequency range spanning from 340 to 3200 Hz. In addition, composite metamaterials exhibit greater robustness compared to resonant metamaterials, demonstrating better noise control capabilities in diffuse sound fields. This work uses a new mechanism to revitalize traditional sound-absorbing materials and bring them back to prominence in noise control. We anticipate that this innovative solution will address noise control challenges in demanding environments and provide a reference for further development of sound-absorbing metamaterials.

Graphical abstract

Keywords

multiple resonance coupling / quality factor modulation / composite absorber / noise control

RIGHTS & PERMISSIONS

Higher Education Press