A Helmholtz Resonator Array for Low-Frequency Broadband Sound Absorption

Helmholtz resonators are widely used to reduce narrow frequency band noise. In this paper, an acoustic absorption structure based on Helmholtz resonator arrays is designed, aimed at achieving continuous broadband and low-frequency sound absorption. The basic unit of the structure is a Helmholtz resonator. The acoustic absorption performance was studied by simulation and experimentation. A 3D printed sound absorber was tested in an impedance tube to verify its sound absorption characteristics. The experimental results are in good agreement with the sound absorption coefficient. The results showed that the coupling effect between the double layer cavity and the neck body enhances the sound absorption performance in the low-frequency band. Experiments show that the designed sound absorption structure has continuous broadband sound absorption in the target range of 300–1100 Hz. This study provides ideas and methods for the structural design of broadband acoustic structures.