Harnessing post-buckling deformation to tune sound absorption in soft Helmholtz absorbers

Gao, Nan; Qu, Sichao; Li, Jian; Wang, Jiao; Chen, Weiqiu

doi:10.1016/j.ijmecsci.2021.106695

Cited by 32 publications

(4 citation statements)

References 58 publications

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“…Then, the unit cell of microlattices can be obtained via the following design steps: (1) transforming all the atomic distances of these crystal structures into struts; (2) hollowing out all the struts; (3) mirroring the 1/8 subdivisions, as plotted in Figure b. The hollow architecture is employed here to improve the mechanical robustness and thus avoid the catastrophic failure always found in traditional truss lattices and plate lattices, , which is significant for sound absorbers in practical applications. , As shown, for an IHMM unit, there are six common nodes in the central position of cube surfaces; the geometric parameters are annotated in Figure b. The side length of it is labeled as l 0 .…”

Section: Design Principlementioning

confidence: 99%

“…The hollow architecture is employed here to improve the mechanical robustness and thus avoid the catastrophic failure always found in traditional truss lattices and plate lattices, 14,33 which is significant for sound absorbers in practical applications. 28,34 As shown, for an IHMM unit, there are six common nodes in the central position of cube surfaces; the geometric parameters are annotated in Figure 1b. The side length of it is labeled as l 0 .…”

Section: Design Principlementioning

confidence: 99%

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Interpenetrating Hollow Microlattice Metamaterial Enables Efficient Sound-Absorptive and Deformation-Recoverable Capabilities

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Owing to the pervasive noise and crash hazards, tough microlattices with sound absorption capabilities are sought-after. However, typical truss microlattices are unable to fulfill this requirement. To overcome this, herein, we report a new design strategy for truss microlattices via introducing the concept of interpenetrating hollow struts, which thereby constitutes a novel interpenetrating hollow microlattice metamaterial (IHMM). The design is based on interweaved unit cells of a hollow octet-truss (HOT) and a hollow rhombic dodecahedron-like (HRDL) truss. Experimentally demonstrated, the IHMM displays a synergistic gain in both sound absorption and mechanical properties that substantially surpass that of its constituent lattices. High sound absorption coefficients (α > 0.99) and broad half-absorption (3.2 kHz) are observed, with the average α being 110.6 and 85.3% higher than those of the HOT and HRDL, respectively. The sound absorption mechanism is attributed to the presence of cascaded Helmholtz resonance, which is then fully elucidated by impedance and damping analyses. The IHMM also outperforms its constituents in specific strength. A simultaneous high strength (4 MPa) and recoverability (80% strain) and pseudo-reusability are also observed. The mechanisms behind the mechanical reinforcement and exceptional robustness are thoroughly revealed. Overall, this work offers insights into developing multifunctional engineering materials.

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Section: Design Principlementioning

confidence: 99%

Section: Design Principlementioning

confidence: 99%

Interpenetrating Hollow Microlattice Metamaterial Enables Efficient Sound-Absorptive and Deformation-Recoverable Capabilities

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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“…They are effective in high-frequency ranges but are too bulky to absorb low-frequency sound with long-wavelengths. Other types of sound absorbers, such as Helmholtz resonators (HRs) 4 – 6 , micro-perforated panels (MPPs) 7 – 9 , and membrane resonators 10 , 11 , can achieve high absorption coefficients at low frequencies due to resonance but have narrow bandwidths. Several studies have combined different resonant-type absorbers 12 , 13 or embedded an element such as a plate into resonators 14 – 17 to obtain additionally separate absorption peaks at low frequencies.…”

Section: Introductionmentioning

confidence: 99%

Near-perfect sound absorption using hybrid resonance between subwavelength Helmholtz resonators with non-uniformly partitioned cavities

Choi,

Jeon

2024

Sci Rep

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We present near-perfect sound absorption using a metasurface composed of meta-atoms (MAs) which are subwavelength Helmholtz resonators (HRs) with cavities non-uniformly partitioned by membranes. By embedding the membranes at different horizontal locations in the cavities, we break geometrical symmetry between the MAs so as to derive hybrid resonance between the MAs at our target frequency. The resonance frequency of each MA is determined by delicately adjusting the locations of the membranes, resulting in perfect absorption at the target frequency which is different from the resonance frequencies of MAs. The metasurface is designed to satisfy impedance matching conditions with air at one or more target frequencies with the aid of a theoretical model for frequency-dependent effective acoustic impedance. The theoretical model is established with physical reality by considering the higher-order eigenmodes of the membrane, the visco-thermal losses in narrow orifices, and the end corrections of the subwavelength HR. The designed metasurface is fabricated and its absorption performance is verified experimentally in an impedance tube. Near-perfect absorption of sound is achieved at the target frequency of 500 Hz, which is 12.3% lower than that of near-perfect absorption by previous metasurfaces inducing hybrid resonance between HRs without membranes.

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“…Finally, flush mounted asymmetric absorbers (FMAAs) in acoustic ducts have been designed and studied in the literature for the unidirectional perfect absorption in reciprocal and asymmetric scattering problems. Various case studies have been reported in the literature: the duct is straight 8 , 10 , 14 – 18 or of varying cross section 9 , the resonators are placed far apart 8 , 10 , 14 – 16 or side-by-side 9 , 17 , 18 , the resonators are identical and assembled in groups 15 or are tuned but have different losses 10 or are detuned 8 , 9 , 14 – 18 , the resonators are assembled in parallel, i.e., different resonators are located at the same position 10 , 14 , 15 , or in cascade 8 – 10 , 14 , 16 , 17 . However, all these cases are focused on two main configurations: (i) wide ducts with spaced resonators, allowing perfect absorption at the condition (where is the wave number and is the distance between resonators), so for large distance between the scatterers and as a consequence for non-compact systems 10 , or (ii) side-by-side resonators with narrow ducts, allowing the suppression of the transmission through a large range of frequencies in which the reflection suppression is produced by the critical coupling condition 9 .…”

Section: Introductionmentioning

confidence: 99%

Compact resonant systems for perfect and broadband sound absorption in wide waveguides in transmission problems

Boulvert

Gabard

Romero‐García

et al. 2022

Sci Rep

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This work deals with wave absorption in reciprocal asymmetric scattering problem by addressing the acoustic problem of compact absorbers for perfect unidirectional absorption, flush mounted to the walls of wide ducts. These absorbers are composed of several side-by-side resonators that are usually of different geometry and thus detuned to yield an asymmetric acoustic response. A simple lumped-element model analysis is performed to link the dependence of the optimal resonators surface impedance, resonance frequency, and losses to the duct cross-sectional area and resonator spacing. This analysis unifies those of several specific configurations into a unique problem. In addition, the impact of the potential evanescent coupling between the resonators, which is usually neglected, is carefully studied. This coupling can have a strong impact especially on the behavior of compact absorbers lining wide ducts. To reduce the evanescent coupling, the resonators should be relatively small and therefore their resonances should be damped, and not arranged by order of increasing or decreasing resonant frequency. Finally, such an absorber is designed and optimized for perfect unidirectional absorption to prove the relevance of the analysis. The absorber is 30 cm long and 5 cm thick and covers a single side of a 14.8 × 15 cm2 rectangular duct. A mean absorption coefficient of 99% is obtained experimentally between 700 and 800 Hz.

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Harnessing post-buckling deformation to tune sound absorption in soft Helmholtz absorbers

Cited by 32 publications

References 58 publications

Interpenetrating Hollow Microlattice Metamaterial Enables Efficient Sound-Absorptive and Deformation-Recoverable Capabilities

Interpenetrating Hollow Microlattice Metamaterial Enables Efficient Sound-Absorptive and Deformation-Recoverable Capabilities

Near-perfect sound absorption using hybrid resonance between subwavelength Helmholtz resonators with non-uniformly partitioned cavities

Compact resonant systems for perfect and broadband sound absorption in wide waveguides in transmission problems

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