Recent advances in acoustic ventilation barriers

Dong, Ruizhi; Sun, Man; Mo, Fangshuo; Mao, Dongxing; Wang, Xu; Li, Yong

doi:10.1088/1361-6463/ac1228

Cited by 25 publications

(10 citation statements)

References 96 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the use of degenerate resonators has been proven to be effective in ventilation sound absorption. The scattering cancellation of the monopole and dipole modes leads to the total absorption of the incident acoustic waves (Dong et al, 2021). Based on this mechanism, Yang et al (Yang et al, 2015a) presented an MAM with degenerate resonators capable of absorbing sound incidents from both sides of a duct.…”

Section: Introductionmentioning

confidence: 99%

Barrier-free duct muffler for low-frequency sound absorption

Gao

Hu²,

Mei

et al. 2022

Front. Mater.

View full text Add to dashboard Cite

We demonstrate a duct muffler design that operates in the low-frequency range (<2000 Hz). The device contained a pair of coupled annular Helmholtz resonators (HRs) and porous material stuffing. HRs were installed as side branches of a circular tube to avoid affecting the ventilation. Porous materials were employed to form an asymmetric intrinsic loss in the HR pair and enable the device to achieve perfect sound absorption. An analytical model based on the temporal coupled-mode theory was derived, and a numerical simulation technique for structural design was introduced and verified. The experimental study demonstrated the effectiveness of the design methodology and illustrated that the device can achieve near-perfect sound absorption in the desired frequency range. A symmetrical configuration of the HRs also experimentally proved to be able to conduct sound absorption for sound incident from both sides of the duct. This study provides a solid foundation for the application of the designed muffler and an analytical explanation of the corresponding sound absorption mechanisms.

show abstract

Section: Introductionmentioning

confidence: 99%

Barrier-free duct muffler for low-frequency sound absorption

Gao

Hu²,

Mei

et al. 2022

Front. Mater.

View full text Add to dashboard Cite

show abstract

“…However, the subwavelength cross section of the coiling path also lead to poor ventilation performance. Therefore, additional subwavelength open units are necessary to provide a channel for air circulation, which makes sound insulation to be more challenging [27].…”

Section: Introductionmentioning

confidence: 99%

“…Considering noise usually covers a wide spectrum and may change dynamically, it is highly desirable to pursuit broadband acoustic ventilation barriers. However, it is difficult to realize by combine multiple Fano-like interferences in low frequency range (<500 Hz), and previous studies have shown that passive broadband ventilation barriers usually are realized at the expense of increasing the total thickness or reducing the sound insulation performance [27,35]. Therefore, it may be more convenient and effective to shift the peak frequencies of sound insulation without changing the total thickness in some application scenarios.…”

Section: Introductionmentioning

confidence: 99%

Frequency-tunable sound insulation via a reconfigurable and ventilated acoustic metamaterial

Li¹,

Zhang²,

Tian³

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

In acoustic engineering, sound-proofing ventilation barriers find wide applications in diverse situations. However, most of the structures only have responses with fixed frequencies and a very narrow frequency range, especially for low frequency acoustics. Here we show a subwavelength acoustic metamaterial based on labyrinthine structures, which possesses tunable sound insulation and ventilation properties. The Fano-like asymmetric transmission dips is formed by the interference between the resonant scattering of discrete states and the background scattering of continuous states. By adjusting the spacing between these two half zigzag molds, the sound insulation dip frequency can shift from 360 Hz to 575 Hz while the free ventilation area ratio is kept to over 36.3% and the total thickness is only about 0.06λ. Moreover, the noise peak frequency can be detected by a microphone detection and adaptive adjustment of the spacing with a small stepping motor is demonstrated, the results agree well with numerical simulations. We anticipate our design may find potential applications in acoustic air vents, soundproofing window and duct noise control.

show abstract

“…In addition, the usage of degenerate resonators is also proved to be effective in the ventilation sound absorption. The scattering cancellation of monopole and dipole modes leads to the total absorption of incident acoustic waves 29 . According to such mechanism, Yang et al 30 presented a MAM with degenerate resonators that capable of absorbing sound incident from both sides of a duct.…”

Section: Introductionmentioning

confidence: 99%

Barrier-Free Duct Muffler For Low-Frequency Sound Absorption

Gao

Hu²,

Murai

et al. 2022

Preprint

View full text Add to dashboard Cite

We demonstrate a duct muffler design operating at frequency range that lower than 2000Hz. The device is composed of coupled annular Helmholtz Resonators (HRs) and installed as side branch of a circular ventilation tube to avoid affecting the ventilation. Porous material is employed for the purpose of generating asymmetric intrinsic loss status of the HR. Analytical model based on temporal coupled-mode theory is introduced and numerical simulation technique for structure design are introduced and verified. Experimental study verifies the effectiveness of the design methodology and illustrate that the device can achieve near perfect sound absorption in the desired frequency range. A symmetry configuration of HRs also experimentally proved to be able to conduct sound absorption for sound incident from both sides of the duct. This work provides a solid foundation for the application of the designed muffler and an analytical explanation of the corresponding sound absorption mechanisms.

show abstract

Recent advances in acoustic ventilation barriers

Cited by 25 publications

References 96 publications

Barrier-free duct muffler for low-frequency sound absorption

Barrier-free duct muffler for low-frequency sound absorption

Frequency-tunable sound insulation via a reconfigurable and ventilated acoustic metamaterial

Barrier-Free Duct Muffler For Low-Frequency Sound Absorption

Contact Info

Product

Resources

About