Sound Transmission Performance of a Ventilated Acoustic Metastructure Composed of Helmholtz Resonator and Thin Membrane

Traditional soundproofing materials face limitations in meeting modern noise reduction demands, particularly in balancing acoustic performance with ventilation requirements. To address this challenge, we propose a novel acoustic metamaterial composed of a Helmholtz resonance cavity coupled with a thin-membrane structure. This hybrid design achieves simultaneous sound insulation, noise reduction, and effective airflow circulation. Numerical results demonstrate that the composite structure exhibits significant low-frequency sound attenuation, with over 10dB of sound transmission loss in low-frequency range of 70~230Hz. Remarkably, the system maintains a peak sound transmission loss of up to 65dB while preserving ventilation functionality. This work also investigates the influence of key geometrical parameters on sound transmission performance of the metastructure. This work provides a promising solution for applications requiring both acoustic control and air circulation in low-frequency range.