Air transparent soundproof window

Abstract

A soundproof window or wall which is transparent to airflow is presented. The design is based on two wave theories of diffraction and acoustic metamaterials. It consists of a three-dimensional array of strong diffraction-type resonators with many holes centered at each individual resonator. The acoustic performance levels of two soundproof windows with air holes of 20mm and 50mm diameters were measured. Sound waves of 80dB in the frequency range of 400 − 5, 000Hz were applied to the windows. It was observed that the sound level was reduced by about 30 − 35dB in the above frequency range with the 20mm window and by about 20 − 35dB in the frequency range of 700 − 2, 200Hz with the 50mm window. It is an extraordinary acoustic anti-transmission. The geometric factors which produced the effective negative modulus were obtained.

The Present and Future Role of Acoustic Metamaterials for Architectural and Urban Noise Mitigations

“…Kim and Lee [80] presented an air transparent (air ventilation) soundproof window for the low-to-mid frequency noise mitigation. The structure consisted of a three-dimensional array of resonators with a centered hole in each resonator (Figure 6a).…”

Wind Pressure Reducing Soundproof Wall Which Has Many Holes on the Surface and Selectable Stop-Frequency Ranges

“…F는 방음판의 구조에 따라 결정되는 기하학적 요소(geometric factor)로써 근사적으로 공진통 부피를 공기통로의 부피로 나눈 값이다 (Fang et al, 2006;Kim, 2015). 예를 들어 공진통의 10%를…”

A tunable acoustic barrier based on periodic arrays of subwavelength slits

“…All these proposed structures are not open so they were not transparent to air. Recently, Kim and Lee 26 proposed a frequency tunable soundproof window with airflow that consists of a three-dimensional array of resonators with many holes centered on each resonator. In this paper we present a new acoustic barrier based on subwavelength slits as an alternative to classical acoustic barriers and to sonic crystal ones.…”