Broadband Acoustic Ventilation Barriers

Sun, Man; Fang, Xinsheng; Mao, Dongxing; Wang, Xu; Li, Yong

doi:10.1103/physrevapplied.13.044028

Cited by 104 publications

(51 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure 5b, the designed acoustic metamaterial was able to reduce the transmitted acoustic energy of up to 94% in the low-frequency regime (~460 Hz). Sun et al [100] demonstrated the acoustic ventilation barriers of planer-profile with subwavelength thickness for the sound barrier in a broad range. Figure 5c shows the schematics of a helical meta-unit cell.…”

Section: Noise Attenuation Through Coiling-up-spacementioning

confidence: 99%

Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances

Kumar¹,

Lee²

2020

Crystals

View full text Add to dashboard Cite

In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which are difficult to find in naturally available materials. The acoustic metamaterials have demonstrated excellent acoustical characteristics that paved a new pathway for researchers to develop effective solutions for a wide variety of multifunctional applications, such as low-frequency sound attenuation, sound wave manipulation, energy harvesting, acoustic focusing, acoustic cloaking, biomedical acoustics, and topological acoustics. This review provides an update on the acoustic metamaterials’ recent progress for simultaneous sound attenuation and air ventilation performances. Several variants of acoustic metamaterials, such as locally resonant structures, space-coiling, holey and labyrinthine metamaterials, and Fano resonant materials, are discussed briefly. Finally, the current challenges and future outlook in this emerging field are discussed as well.

show abstract

Section: Noise Attenuation Through Coiling-up-spacementioning

confidence: 99%

Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances

Kumar¹,

Lee²

2020

Crystals

View full text Add to dashboard Cite

show abstract

“…A total insertion loss of 8.8 dB can be achieved between 100 and 500 Hz with the hybrid silencer, and the insertion loss of the staggered window with the proposed silencers installed is shown to increase from 6.7 to 15.6 dBA between 100 and 2000 Hz for normal incident traffic noise. Compared with the recent work in noise insulation ventilation windows, which either work in a limited frequency band 28 , 29 , or in a broad band but at higher frequencies 26 , 30 , 31 , this work extends the working frequencies of the silencer to as low as 100 Hz, and increases the effective band width to 1900 Hz. Another improvement is that we carried out experiments with a real scale down model of a staggered window, instead of in an impedance tube with normal incident sound, thus demonstrated the feasibility of the silencer to be used in practical applications.…”

Section: Introductionmentioning

confidence: 98%

Broadband noise insulation of windows using coiled-up silencers consisting of coupled tubes

Wang

Tao

Qiu

et al. 2021

Sci Rep

View full text Add to dashboard Cite

It has been demonstrated that a staggered window achieves better noise reduction performance than a traditional single glazing one at middle to high frequencies while maintaining a degree of natural ventilation. There is, however, little improvement in the low frequency range. In contrast, this work proposes to apply coiled-up silencers consisting of coupled tubes on the side walls of staggered windows to obtain noise attenuation in a broad band, especially in the low frequency range. Each element in the silencer consists of two coupled tubes with different cross sections so that noise at more frequencies can be attenuated than that with a uniform cross section. The simulation results show that 8.8 dB overall insertion loss can be obtained between 100 and 500 Hz after applying a combination of silencers designed at 7 different frequencies, and the insertion loss of the staggered window is increased from 6.7 to 15.6 dBA between 100 and 2000 Hz for normal incident traffic noise with the proposed silencers installed. The design is validated by the experiments with a 1:4 scale down model.

show abstract

“…However, these acoustic metamaterials cannot work with free fluid such as air. The acoustic metamaterials that can work in free fluid have been proposed but cannot solve the problem of absorption of low frequency sound [20][21][22][23][24][25][26][27] . Furthermore, the majority of acoustic metamaterials that have been proposed and demonstrated in the past two decades are passive with fixed geometries.…”

Section: Introductionmentioning

confidence: 99%

Ultra-open ventilated metamaterial absorbers for sound-silencing applications in environment with free air flows

et al. 2020

Extreme Mechanics Letters

View full text Add to dashboard Cite

For most acoustic metamaterials, once they have been fabricated, their operating frequencies and functions cannot be adjusted, which is an intrinsic barrier for development of realistic applications. The study to overcome this limit has become an urgent issue at the heart of acoustic metamaterial engineering. Although with the advance of metamaterials in the past two decades, a series of methods such as electric or magnetic control have been proposed, most of them can only work in the condition of no fluid passage. Some metamaterials with large transmission losses have been proposed, but the sounds are essentially reflected rather than absorbed. Here, to overcome this intrinsic difficulty, we propose a ventilated sound absorber that can be manually tuned in a large range after being manufactured. During the tuning which is 2 achieved through an intricately designed slider, high-performance absorption and ventilation are both ensured. The tunable ventilated sound absorber is demonstrated experimentally and the effective model of coupled lossy oscillators can be employed to understand its mechanism. The manually tunable ventilated metamaterial has the potential application values in various complicated pipe systems that require frequency adjustment and it also establishes the foundation for future development of active tunable ventilated acoustic metamaterials.

show abstract

Broadband Acoustic Ventilation Barriers

Cited by 104 publications

References 39 publications

Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances

Recent Advances in Acoustic Metamaterials for Simultaneous Sound Attenuation and Air Ventilation Performances

Broadband noise insulation of windows using coiled-up silencers consisting of coupled tubes

Ultra-open ventilated metamaterial absorbers for sound-silencing applications in environment with free air flows

Contact Info

Product

Resources

About