Omnidirectional Ventilated Acoustic Barrier
Hai-long Zhang, Yi-fan Zhu, Bin Liang, Jing Yang, Jun Yang, and, Jian-chun Cheng

TL;DR
This paper introduces an omnidirectional acoustic barrier with subwavelength thickness that effectively blocks low-frequency sound from all directions while maintaining high ventilation, achieved through a novel interference-based design.
Contribution
It presents a new design of a thin, ventilated acoustic barrier utilizing Fano-like interference, combining simplicity in fabrication with effective sound insulation and airflow.
Findings
Blocks low-frequency sound from all directions
Allows 63% air flow through the barrier
Matches simulated results with experimental measurements
Abstract
As an important problem in acoustics, sound insulation finds applications in a great variety of situations. In the existing schemes, however, there has always been a tradeoff between the thinness of sound-insulating devices and their ventilating capabilities, limiting their potentials in the control of low-frequency sound in high ventilation environments. Here we design and experimentally implement an omnidirectional acoustic barrier with planar profile, subwavelength thickness (0.18lambda) yet high ventilation. The proposed mechanism is based on the interference between the resonant scattering of discrete states and the background scattering of continuous states that induces Fano-like asymmetric transmission profile. Benefitting from the binarystructured design of coiled unit and hollow pipe, it maximally simplifies the design and fabrication while ensuring the ventilation for all the…
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