Acoustic metamaterials with zero-index behaviors and sound attenuation

Wu, Guanghua; Ke, Yibo; Zhang, Lin; Tao, Meng

doi:10.1088/1361-6463/ac6638

Cited by 8 publications

(6 citation statements)

References 46 publications

(52 reference statements)

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“…Therefore, we construct a broadband sound insulation ultrasonic material by multicell coupling on the premise of not increasing thickness and reducing ventilation. Compared with the previous work [37][38][39][40][41], the proposed broadband sound insulation metamaterials have improved both the sound insulation bandwidth and the sound insulation peak value in the field of ventilation sound insulation.…”

Section: Introductionmentioning

confidence: 85%

“…However, there are many application scenarios that require both ventilation and sound insulation such as fan rooms and ventilation windows at subway gates. In recent years, a group of scholars have conducted extensive research on the performance of ventilation sound insulation, but the current ventilation sound insulation structure has the challenge of low sound insulation [37][38][39]and narrow sound insulation band [40,41].…”

Section: Introductionmentioning

confidence: 99%

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A football-like acoustic metamaterial with near-zero refractive index and broadband ventilated sound insulation

Wang,

Chen,

Liu

2023

J. Phys. D: Appl. Phys.

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Acoustic metamaterial with negative or near-zero refractive index exhibits extraordinary acoustic transmission characteristics, including acoustic total reflection, acoustic stealth and acoustic tunneling. Based on the coiled-up space structure, a football like near-zero refractive index acoustic metamaterial (FNZIM) was proposed. The result reveals the formation of two transmission peaks at 1270 Hz and 2300 Hz from the equivalent parameters by using the transfer matrix method. The first peak exhibits excellent air impedance matching, while the second peak arising from the metamaterial’s near-zero refractive index. We then constructed an acoustic prism using 15 cells of FNZIM and calculated the dispersion curve, revealing that the near-zero refractive index supernormal transmission of metamaterials is attributable to multimode degeneracy. Furthermore, we find that the positions of the transmission peaks and transmission loss can be adjusted by appropriately altering the structural parameters. Finally, we tested two groups of samples by using impedance tube four-channel to verify the accuracy of the simulation and the validity of insulation performance of FNZIM. The broadband ventilation sound insulation coupled structure is constructed, and the average sound insulation performance of this structure is more than 25 dB in the range of 1140–2210 Hz.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

A football-like acoustic metamaterial with near-zero refractive index and broadband ventilated sound insulation

Wang,

Chen,

Liu

2023

J. Phys. D: Appl. Phys.

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“…© 2022 The Japan Society of Applied Physics convenience, we use the metamaterial plate that was constructed from previous research, 30) which contains 6 × 6 unit cells and exhibits a near-zero mass density at 1439 Hz. Figure 3(a) shows that at 1439 Hz, incident waves encounter a strong reflection and are distorted by imperfections of the waveguide.…”

Section: Parameters Symbol Valuementioning

confidence: 99%

“…This figure contains acoustic channels and cavities and exhibits near-zero mass density at a specific frequency. 30) Both the plate with a slit and metamaterials are fabricated by epoxy resonance, as shown in Fig. 1(c).…”

mentioning

confidence: 99%

Acoustic extraordinary transmission based on near-zero-index metamaterials

Tao

2022

Appl. Phys. Express

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A new strategy for enhancing sound transmission in a waveguide that contains a narrow slit is proposed. Two metamaterials with near-zero mass density are placed in the waveguide to make the effective mass density of air in the middle region vanish. Both simulation and experimental results demonstrate the effectiveness of the proposed strategy. Due to the wave manipulation characteristics of near-zero metamaterials, sound transmission exhibits high robustness, which is independent of waveguide shape and inserted defects. Finally, FP-like resonances in the metamaterials-slit system leads to a gain effect for sound transmission. Moreover, applications in acoustic sensing and cloaking are envisioned.

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“…Acoustic metamaterials with extraordinary acoustic behaviors have recently been developed to control vibration and noise [23][24][25][26][27][28]. Various innovative acoustic meta-silencers (AMS) have been proposed rapidly and show excellent performance to suppress the noise in ducts [2,[29][30][31][32][33].…”

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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Acoustic metamaterials with zero-index behaviors and sound attenuation

Cited by 8 publications

References 46 publications

A football-like acoustic metamaterial with near-zero refractive index and broadband ventilated sound insulation

A football-like acoustic metamaterial with near-zero refractive index and broadband ventilated sound insulation

Acoustic extraordinary transmission based on near-zero-index metamaterials

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

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