3D Single-port Labyrinthine Acoustic Metamaterial

TL;DR

This paper presents a novel 3D single-port labyrinthine acoustic metamaterial capable of tunable, broadband sound absorption at low frequencies, achieved through innovative curled perforations with adjustable parameters.

Contribution

The study introduces a new design of labyrinthine metamaterials with adjustable absorption bandwidth and thickness, demonstrating effective low-frequency sound absorption with a simple single-port structure.

Findings

Achieves up to 51% relative absorption bandwidth.

Maintains deep subwavelength thickness of 0.07λ.

Demonstrates tunability of absorption band position and width.

Abstract

In this paper, we report on the design, fabrication, and experimental characterization of a 3D single-port labyrinthine acoustic metamaterial. By using curled perforations with one end closed and with appropriate loss inside, the proposed metamaterial can perfectly absorb airborne sounds in a low frequency band. Both the position and width of the band can be tuned flexibly. A tradeoff is uncovered between the relative absorption bandwidth and thickness of the metamaterial. When the relative absorption bandwidth is as high as 51%, the requirement of deep subwavelength thickness (0.07{\lambda}) can still be satisfied.