Damped resonance for broadband acoustic absorption in one-port and two-port systems

Lee, Taehwa; Nomura, Tsuyoshi; Iizuka, Hideo

doi:10.1038/s41598-019-49222-w

Cited by 29 publications

(24 citation statements)

References 39 publications

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“…Also, the ultrasparse acoustic absorber had shown the excellent tunability for the air-flow-direction control and optical cloaking. A similar kind of sparse absorber has also been demonstrated by Lee et al [105]. As illustrated in Figure 7b, the meta-absorber consisted of an array of dual resonance unit cells.…”

Section: Acoustic Meta-absorberssupporting

confidence: 55%

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

Kumar¹,

Lee²

2020

Crystals

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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.

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Section: Acoustic Meta-absorberssupporting

confidence: 55%

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

“…absorber had shown the excellent tunability for the air-flow-direction control and optical cloaking. A similar kind of sparse absorber has also been demonstrated by Lee et al [104]. As illustrated in Figure 7(b), the meta-absorber consisted of an array of dual resonance unit cells.…”

Section: Acoustic Meta-absorberssupporting

confidence: 53%

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

Kumar¹,

Lee²

2020

Preprint

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In the past two decades, acoustic metamaterials have garnered much attention owing to their unique functional characteristics, which is difficult to be found in naturally available materials. The acoustic metamaterials have demonstrated to exhibit 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 is discussed as well.

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“…Conventionally, the mu ing effect of a single HR has been used in long and narrow holes that can be regarded as one-dimensional sound elds, such as long ducts [23][24][25][26][27][28][29][30] . In general, if the axial length of the hole corresponding to the sound eld is not su ciently long compared to the wavelength, interference causes a pressure gradient in the radial direction of the hole.…”

Section: Theory and Designmentioning

confidence: 99%

Acoustic notch filtering earmuff utilizing Helmholtz resonator arrays

Mizukoshi

Takahashi

2021

Preprint

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In recent years, noisy bustling environments have created situations in which earmuffs must soundproof only specific noise while transmitting significant sounds, such as voices, for work safety and efficiency. Two sound insulation technologies have been utilized: passive noise control (PNC) and active noise control (ANC). However, PNC is incapable of insulating selective frequencies of noise, and ANC is limited to low-frequency sounds. Thus, it has been difficult for traditional earmuffs to cancel out only high-frequency noise that people feel uncomfortable hearing. Here, we propose an acoustic notch filtering earmuff utilizing Helmholtz resonator (HR) arrays that provides a sound attenuation effect around the tuneable resonant frequency. A sheet-like sound insulating plate comprising HR arrays is realized in a honeycomb structure. Since the resonant frequency is determined by the geometry of the HR arrays, a highly audible sound region can be designed as the target frequency. In this research, the acoustic notch filtering performance of the proposed HR array plate was investigated in both simulations and experiments. Furthermore, the fabricated earmuffs using the novel HR array plates achieved a sound insulation performance exceeding 40 dB at the target frequency, which is sufficiently high compared to conventional earmuffs. The experimental results confirm that the proposed device is a useful approach for insulating frequency-selective sound.

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Damped resonance for broadband acoustic absorption in one-port and two-port systems

Cited by 29 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

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

Acoustic notch filtering earmuff utilizing Helmholtz resonator arrays

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