Ultra-broadband acoustic absorber based on periodic acoustic rigid-metaporous composite array

TL;DR

This paper introduces an ultra-broadband, wide-angle acoustic absorber using a periodic rigid-metaporous composite array, achieving high absorption efficiency across a broad frequency range and incident angles, addressing noise pollution effectively.

Contribution

It presents a novel design for an acoustic absorber that significantly improves broadband and wide-angle absorption performance compared to traditional solutions.

Findings

Achieves an average absorption coefficient of 90.9% from 500 to 4000 Hz

Effective at incident angles from -75 to +75 degrees

Addresses low-frequency noise pollution effectively

Abstract

To address the increasingly serious issue of noise pollution, we propose an ultra-broadband and wide-angle acoustic absorber based on a periodic acoustic rigid-metaporous composite array. Numerical simulation results verify the broadband good acoustic absorption performance of the proposed absorber, which can achieve an average absorption coefficient of approximately 90.9% within the frequency band from 500 to 4000 Hz with incident angles ranging from -75 to +75 degrees, thus compensating for the shortcomings of traditional acoustic absorbers that are not as effective at low frequencies. This work will provide a new approach for ultra-broadband and wide-angle acoustic wave absorption and noise suppression.