Acoustic perfect absorbers via Helmholtz resonators with embedded apertures

TLDR

Acoustic perfect absorption via a deep subwavelength structure remains a key research and engineering goal. The study aims to investigate acoustic systems based on Helmholtz resonators with embedded apertures. The investigation is carried out through analytical modeling and experimental validation. Embedding apertures enables perfect absorption (0.999) in a structure only ~1/50th of the wavelength thick, with tunable resonant frequency (137–300 Hz) and bandwidth (22%–46%) while preserving perfect absorption and constant shape; a conservation factor guides design, and the approach outperforms a related metasurface with a coiled backing cavity, offering a path to highly efficient, thin, tunable absorbers.

Abstract

Acoustic perfect absorption via a structure with deep subwavelength thickness is of great and continuing interest in research and engineering. This study analytically and experimentally investigates acoustic systems based on Helmholtz resonators which have embedded-apertures. The strategy of embedding apertures greatly improves the ability to manipulate the impedance of the systems. Based on the inverted configuration, perfect absorption has been realized (reaching 0.999 in experiments) via a design whose thickness is only ∼1/50th of the operating wavelength. Moreover, a tunable resonant frequency (137–300 Hz) and tunable absorption frequency bandwidth (22%–46%) can be achieved while preserving the perfect absorption performance and constant external shape. In tuning the perfect absorbers having a constant thickness, a conservation factor is revealed experimentally and then verified analytically, which could guide absorbers' design and facilitate the tuning. In addition, the distinct features of the proposed design were evaluated and validated and were compared with those of a related structure, a metasurface with a coiled backing cavity. The results have the potential to help with the design of highly efficient, thin, and tunable acoustic absorbers.