Broadband Low-Frequency Sound Absorption Based on Helmholtz Resonators Embedded with Microperforated Panel
DOI:
https://doi.org/10.54097/g2sadz02Keywords:
Helmholtz resonator, sound absorption, noise control, low-frequencyAbstract
This study proposes a novel Helmholtz resonator embedded with a microperforated panel (HREMPP) for broadband low-frequency sound absorption. A theoretical model was validated by simulations. The 50-mm-thick HREMPP unit achieves near-perfect absorption at 250 Hz with a bandwidth 50% wider than a conventional Helmholtz resonator. Parameter analysis reveals how neck radius, neck length, and micro-perforation radius tune the performance. By parallel coupling two units with different neck radii (2 mm and 3 mm) while maintaining a 50 mm total thickness, a broadband metamaterial is created. It exhibits two absorption peaks at 208 Hz and 284 Hz, forming a continuous broad absorption band from 176 Hz to 358 Hz. This work provides a design for ultra-thin, broadband, low-frequency acoustic absorbers.
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