Broadband Low-Frequency Acoustic Metamuffler

Shen, Lang; Zhu, Yifan; Mao, Feilong; Gao, Siyuan; Su, Zihao; Luo, Zhitao; Zhang, Hui; Assouar, Badreddine

doi:10.1103/physrevapplied.16.064057

Cited by 31 publications

(7 citation statements)

References 28 publications

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“…With typical strongly enhanced acoustic fields and subwavelength structural scale, the initial designs of sound-absorbing metamaterials are remarkably efficient for narrow-band performances [17][18][19][20][35][36][37][38][39]. In pursuit of broadband sound absorption/attenuation, an efficient approach is to combine a series of component acoustic absorbers operating at different frequencies [31,34,[40][41][42][43][44][45][46][47][48][49][50][51][52]. Despite the fascinating achievements of high-efficiency broadband sound absorption/attenuation, it still remains a significant gap in the realization of timbre manipulation since timbre manipulation puts higher demands on the frequency-selective and delicate modulation of resonances in broadband.…”

Section: Introductionmentioning

confidence: 99%

Meta-silencer with designable timbre

Wang

Zhou

Qiu

et al. 2023

Int. J. Extrem. Manuf.

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Timbre, as one of the essential elements of sound, plays an important role in determining sound properties, whereas its manipulation has been remaining challenging for passive mechanical systems due to the intrinsic dispersion nature of resonances. Here, we present a meta-silencer supporting intensive mode density as well as highly tunable intrinsic loss and offering a fresh pathway for designable timbre in broadband. Strong global coupling is induced by intensive mode density and delicately modulated with the guidance of the theoretical model, which efficiently suppresses the resonance dispersion and provides desirable frequency-selective wave-manipulation capacity for timbre tuning. As proof-of-concept demonstrations for our design concepts, we propose three meta-silencers with the designing targets of high-efficiency broadband sound attenuation, efficiency-controlled sound attenuation and designable timbre, respectively. The proposed meta-silencers all operate in a broadband frequency range from 500 to 3200 Hz and feature deep-subwavelength sizes around 50 mm. Our work opens up a fundamental avenue to manipulate the timbre with passive resonances-controlled acoustic metamaterials and may inspire the development of novel multifunctional devices in noise-control engineering, impedance engineering, and architectural acoustics.

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Section: Introductionmentioning

confidence: 99%

Meta-silencer with designable timbre

Wang

Zhou

Qiu

et al. 2023

Int. J. Extrem. Manuf.

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show abstract

“…To expand the working bandwidth, the complex resonance coupling effect among the units can be exploited [36,40]. In fact, coupling multiple units to achieve a broad bandwidth is the most direct and effective way in the metamaterial design [41][42][43][44]. Recently, several broadband locally-resonant AMS have been proposed [38,42,45,46].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, coupling multiple units to achieve a broad bandwidth is the most direct and effective way in the metamaterial design [41][42][43][44]. Recently, several broadband locally-resonant AMS have been proposed [38,42,45,46]. For example, Nguyen [37] proposed a subwavelength double-layer acoustic silencer based on the slit-type Helmholtz resonators, and the fluctuating TL produced by various resonances can be mitigated via the thermal viscosity inside the HR slit.…”

Section: Introductionmentioning

confidence: 99%

Compact broadband acoustic meta-silencer based on synergy between reactive and resistive units

Zhang¹,

Yu²,

Xiao³

et al. 2022

J. Phys. D: Appl. Phys.

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Acoustic silencers are the most effective solution to control noise in ducts. In this paper, we propose a compact acoustic meta-silencer (AMS) based on the synergy between reactive and resistive units that enables the reduction of low-frequency and broadband noise. We first propose a conceptual AMS comprising simple reactive and resistive units to verify its unique sound attenuation performance. To explore its potential for application, we then propose an advanced AMS unit consisting of two independent annular chambers that represent reactive and resistive units, respectively. The synergistic mechanism between reactive and resistive units to achieve superior sound attenuation is revealed. Next, the band structures of the infinite periodic advanced AMS are discussed, and three different types of advanced AMS containing six units are examined. It is demonstrated numerically and experimentally that the optimized AMS with a compact size can achieve a transmission loss (TL) higher than 15 dB over a super-wide low-frequency range (290 Hz–1344 Hz). The work here provides a new avenue for the design of low-frequency and broadband meta-silencers to control the noise in ducts.

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“…Sound absorbers have attracted considerable interest from both the physics and engineering communities due to their important potential applications, such as noise control and architectural acoustics. Recent advancement of metamaterials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] with the ability of manipulating wave propagation in unprecedented ways, has motivated a variety of sound absorber designs, which show superior absorptive features than conventional structures, such as porous and fibrous materials and micro-perforated plates. The demonstrated sound absorbers based on the acoustic metamaterials are usually composed of deep sub-wavelength resonant unit cells to absorb and dissipate sound energy inside, such as Helmholtz resonators [21-26], coiled Fabry-Perot resonators [27][28][29], sound membranes [30][31][32][33], acoustic metasurfaces [34][35][36], split-ring-resonators [37][38][39], Mie resonators [40,41], etc.…”

Section: Introductionmentioning

confidence: 99%

Broadband low-frequency sound absorption in open tunnels with deep sub-wavelength Mie resonators

Xia

Sun²,

Guan³

et al. 2022

Front. Phys.

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We report both experimentally and numerically that near-perfect absorption of low-frequency sound is realized in an open tunnel embedded with two deep sub-wavelength (0.085 λ) Mie resonators. The resonators are composed of a multiple-cavity structure and an outer frame on three sides. In the eigenmode analysis, we obtain two types of monopolar Mie resonance modes (MMR I&II) in a single resonator around 250 Hz. The eigenfrequency of MMR I is mainly determined by the Helmholtz resonance of each cavity in the multiple-cavity structure, while that of MMR II is closely related to the coupling between the multiple-cavity structure and its outer frame, showing high performances of coupling and sound absorption. Based on the thermal viscous loss of sound energy in the channels created by the mutual coupling of MMR II of both Mie resonators with different diameters, the near-perfect sound absorption through the open tunnel is realized around 283 Hz. More interestingly, by increasing the number of Mie resonators in the tunnel, a broadband near-perfect sound absorption is observed, and the fractional bandwidth can reach about 0.25 and 0.46 for the tunnels with 6 and 13 resonators, The proposed deep sub-wavelength Mie resonator and its associated near-perfect sound absorptions have great potential applications in architectural acoustics and mechanical engineering.

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Broadband Low-Frequency Acoustic Metamuffler

Cited by 31 publications

References 28 publications

Meta-silencer with designable timbre

Meta-silencer with designable timbre

Compact broadband acoustic meta-silencer based on synergy between reactive and resistive units

Broadband low-frequency sound absorption in open tunnels with deep sub-wavelength Mie resonators

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