Analysis of Low-frequency Broadband Sound Absorption Characteristics of Porous Acoustic Metamaterials
In response to the difficulty of managing low-frequency noise on urban roads,this paper proposed a porous acoustic metamaterial based on Helmholtz resonator for the internal material of traffic sound barriers to broaden the frequency band and enhance the sound absorption effect.The finite ele-ment method was used to establish a unit cell model of the acoustic metamaterial and analyze the effects of the perforated structure and other parameters on the sound absorption performance.The results show that in the low-frequency range below 500 Hz,the perforated structure changes the propagation path of sound waves in the porous material,which effectively improves the sound absorption efficiency and per-formance.The sound absorption bandwidth is further broadened after the introduction of the elastic thin plate,and the overall sound absorption effect is significantly enhanced.This study can provide a refer-ence for the design of sound absorption structures inside sound barriers.
low-frequency sound absorptionacoustic metamaterialsfinite element methodporous materials
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