New-parallel connection of the Helmholtz resonator with embedded apertures for low-frequency broadband sound absorption

Zhang, Junzhe; Chen, Tianning; Xin, Fengxian; Zhu, Jiang; Ding, Wei

doi:10.35848/1347-4065/ac7761

Cited by 6 publications

(6 citation statements)

References 36 publications

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“…According to the analysis of influence of structural parameters to sound absorption performance of double resonators and the similar research in literatures [ 41 , 42 , 43 , 44 ], it could be concluded that length of the cavity was the most suitable parameter to be the adjustable variable, which was easy to realize the adjustment for an already prepared acoustic metamaterial and it did not influence relative independence of each chamber. Thus, this analysis provided theoretical foundation and basis for the proposed APH-AM in this research.…”

Section: Materials and Designmentioning

confidence: 74%

“…Furthermore, the resonance frequencies f 0 of resonator 2 moved to the low frequency direction along with the increase of length of its cavity, which was easy to realize adjustment by moving the back panel in the chamber relative to length or diameter of the aperture and other parameters. Therefore, length of the cavity was selected as the adjustable variable for the proposed APH-AM in this research, which was same with the selection in some literatures [ 41 , 42 , 43 , 44 ]. The absorption peak was controlled through adjusting the geometric parameters of the Helmholtz resonator with embedded apertures by Zhang et al [ 41 ], and the absorption bandwidth could also be flexibly adjusted with a fixed thickness.…”

Section: Materials and Designmentioning

confidence: 99%

“…Therefore, length of the cavity was selected as the adjustable variable for the proposed APH-AM in this research, which was same with the selection in some literatures [ 41 , 42 , 43 , 44 ]. The absorption peak was controlled through adjusting the geometric parameters of the Helmholtz resonator with embedded apertures by Zhang et al [ 41 ], and the absorption bandwidth could also be flexibly adjusted with a fixed thickness. Peng et al [ 43 ] had optimized the second cavity in the dual Helmholtz resonators, which could significantly increase the generated electric voltage up to 400%.…”

Section: Materials and Designmentioning

confidence: 99%

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Development of Adjustable Parallel Helmholtz Acoustic Metamaterial for Broad Low-Frequency Sound Absorption Band

Yang

Shen

et al. 2022

Materials

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For the common difficulties of noise control in a low frequency region, an adjustable parallel Helmholtz acoustic metamaterial (APH-AM) was developed to gain broad sound absorption band by introducing multiple resonant chambers to enlarge the absorption bandwidth and tuning length of rear cavity for each chamber. Based on the coupling analysis of double resonators, the generation mechanism of broad sound absorption by adjusting the structural parameters was analyzed, which provided a foundation for the development of APH-AM with tunable chambers. Different from other optimization designs by theoretical modeling or finite element simulation, the adjustment of sound absorption performance for the proposed APH-AM could be directly conducted in transfer function tube measurement by changing the length of rear cavity for each chamber. According to optimization process of APH-AM, The target for all sound absorption coefficients above 0.9 was achieved in 602–1287 Hz with normal incidence and that for all sound absorption coefficients above 0.85 was obtained in 618–1482 Hz. The distributions of sound pressure for peak absorption frequency points were obtained in the finite element simulation, which could exhibit its sound absorption mechanism. Meanwhile, the sound absorption performance of the APH-AM with larger length of the aperture and that with smaller diameter of the aperture were discussed by finite element simulation, which could further show the potential of APH-AM in the low-frequency sound absorption. The proposed APH-AM could improve efficiency and accuracy in adjusting sound absorption performance purposefully, which would promote its practical application in low-frequency noise control.

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Section: Materials and Designmentioning

confidence: 74%

Section: Materials and Designmentioning

confidence: 99%

Section: Materials and Designmentioning

confidence: 99%

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Development of Adjustable Parallel Helmholtz Acoustic Metamaterial for Broad Low-Frequency Sound Absorption Band

Yang

Shen

et al. 2022

Materials

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“…Limited by the preparation technique and fabrication accuracy, the shape of the embedded aperture is cylindrical and the cross-sectional shape is circular, although the shape of the chamber can be adjusted for ease of installation [ 16 , 17 , 18 , 19 , 20 ]. Zhang et al [ 16 ] designed kinds of new parallel connections of the HR with the embedded aperture, the working wavelength of which was about 57 times its total thickness of 43 mm. The average sound absorption coefficient was as high as 0.8.…”

Section: Introductionmentioning

confidence: 99%

Effects of Aperture Shape on Absorption Property of Acoustic Metamaterial of Parallel-Connection Helmholtz Resonator

Yang

Tang³

et al. 2023

Materials

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A Helmholtz resonator (HR) with an embedded aperture is an effective acoustic metamaterial for noise reduction in the low-frequency range. Its sound absorption property is significantly affected by the aperture shape. Sound absorption properties of HRs with the embedded aperture for various tangent sectional shapes were studied by a two-dimensional acoustic finite element simulation. The sequence of resonance frequency from low to high was olive, common trapeziform, reverse trapeziform, dumbbell and rectangle. Meanwhile, those HRs for various cross-sectional shapes were investigated by a three-dimensional acoustic finite element simulation. The sequence of resonance frequency from low to high were round, regular hexagon, square, regular triangle and regular pentagon. Moreover, the reason for these phenomena was analyzed by the distributions of sound pressure, acoustic velocity and temperature. Furthermore, on the basement of the optimum tangent and cross-sectional shape, the sound absorption property of parallel-connection Helmholtz resonators was optimized. The experimental sample with optimal parameters was fabricated, and its average sound absorption coefficient reached 0.7821 in 500–820 Hz with a limited thickness of 30 mm. The research achievements proved the significance of aperture shape, which provided guidance for the development of sound absorbers in the low-frequency range.

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“…A preferable option is to incorporate multiple components in parallel, forming a continuous broad absorption band by assembling diverse absorption peaks. Several broadband absorbers have been reported by coupling multiple HRs [22,[39][40][41][42] or space-coiling structures [43][44][45][46]. These options have a common element of exploiting a multi-modal system, each mode having low dissipation, to achieve broadband absorption [47].…”

Section: Introductionmentioning

confidence: 99%

Low-frequency broadband absorber with coherent coupling based on perforated panel and space-coiling channels

Wang,

Luo,

Xiang

et al. 2023

J. Phys. D: Appl. Phys.

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Efficient broadband absorption of low-frequency sound via ultra-thin structure remains challenging due to the narrow-band property generated by the dispersive nature of resonance. In this study, we investigate the absorption mechanism of a component composed of a perforated panel and space-coiling channels through the coupling effect, acoustic impedance matching, and complex frequency analysis. In addition, the influence of geometrical parameters, resonance frequency intervals, and number of components in the coupled system on the band is investigated. Accordingly, the strategy for developing absorbers is to design individual components in the under-damped state by adjusting the geometrical parameters, then put together multiple components with different channel lengths in parallel. On the basis of this strategy, a low-frequency and broadband absorber is theoretically proposed and experimentally demonstrated, which can achieve broadband absorption from 250 Hz to 450 Hz. The design strategy has potential applications in low-frequency noise control engineering, such as plants, automotive and aerospace industries.

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New-parallel connection of the Helmholtz resonator with embedded apertures for low-frequency broadband sound absorption

Cited by 6 publications

References 36 publications

Development of Adjustable Parallel Helmholtz Acoustic Metamaterial for Broad Low-Frequency Sound Absorption Band

Development of Adjustable Parallel Helmholtz Acoustic Metamaterial for Broad Low-Frequency Sound Absorption Band

Effects of Aperture Shape on Absorption Property of Acoustic Metamaterial of Parallel-Connection Helmholtz Resonator

Low-frequency broadband absorber with coherent coupling based on perforated panel and space-coiling channels

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