Broadband sound absorption using multiple hybrid resonances of acoustic metasurfaces

Ryoo, Hyeonbin; Jeon, Wonju

doi:10.1016/j.ijmecsci.2022.107508

Cited by 52 publications

(9 citation statements)

References 57 publications

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“…With increasing frequency, the sound absorption coefficients of A1* and A3* first increased and then decreased (Figure 8A). A3* exhibited a broader acoustic performance than A1*, reaching a peak value of 0.42 at the frequency of 3180 Hz, indicating a resonance acoustic absorption mechanism 37 . As the frequency of the incident sound wave aligned with the intrinsic frequency of the material, a resonance phenomenon occurred, causing the sound wave to resonate with the material during its propagation through the WF panel.…”

Section: Resultsmentioning

confidence: 96%

“…A3* exhibited a broader acoustic performance than A1*, reaching a peak value of 0.42 at the frequency of 3180 Hz, indicating a resonance acoustic absorption mechanism. 37 As the frequency of the incident sound wave aligned with the intrinsic frequency of the material, a resonance phenomenon occurred, causing the sound wave to resonate with the material during its propagation through the WF panel. This resonance led to a significant dissipation of sound energy through mechanisms such as viscous flow loss, internal friction loss, and vibration damping, resulting in the highest acoustic absorption.…”

Section: Acoustic Absorption Propertiesmentioning

confidence: 99%

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Effect of stacking order on the properties of hybrid palm sheath/polyester fiber felt‐reinforced polymer composite laminates

Tang,

Liu,

Bai

et al. 2024

Polymer Composites

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Natural fiber‐reinforced composites exhibit excellent mechanical properties. However, achieving a balance between excellent mechanical properties and optimal acoustic performance remains a challenge. In this study, four composite laminates with different stacking orders were fabricated using polyester fiber mats (WFs) and palm sheaths (WPs) through a hot‐press process. Moreover, the effects of different stacking orders on the mechanical and acoustic properties of the composite were investigated. The results revealed that the incorporation of polyester fiber felts and the modification of the layup sequence of WP and polyester fiber felts significantly improved the mechanical and acoustic properties of the composites. Scanning electron microscopy images revealed a strong bonding between palm fibers and polyester fibers at the epoxy resin interface. Compared with pure palm fiber composites, the alternately stacked palm fibers and polyester fibers (WP/WP/WF/WP/WF) exhibited the highest mechanical properties, with a significant enhancement of 142.67% and 16.90% in flexural and tensile strengths, respectively. Additionally, the peak absorption coefficient of polyester fiber felts, positioned in the surface layer of the composite material, within the 2580–3400 Hz frequency band significantly increased from 0.07 to 0.44. Therefore, this study indicates that modifying the stacking order improves the mechanical and acoustic properties of the composites, making them suitable for use in acoustic engineering materials for buildings and decorative panels for furniture, including perforated panels and acoustic screens.Highlights The fabric‐like textured structure significantly enhanced the overall performance of the composites. The stacking order significantly influenced the overall properties of the composite. Alternately stacked polyester fiber felts and palm fibers exhibited excellent mechanical performance. The polyester fiber felts positioned on the surface layer of the composites exhibited superior mechanical performance. A laminate with “green” attributes and good acoustic properties was fabricated.

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Section: Resultsmentioning

confidence: 96%

Section: Acoustic Absorption Propertiesmentioning

confidence: 99%

Effect of stacking order on the properties of hybrid palm sheath/polyester fiber felt‐reinforced polymer composite laminates

Tang,

Liu,

Bai

et al. 2024

Polymer Composites

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“…Since it is difficult to accurately control the tension, a design approach that is less sensitive to tension is required to enhance performance. For the various mechanical systems that generate noise at multiple frequencies or in a broad frequency range, the metasurface needs to absorb a wider frequency band or multiple frequencies [41][42][43][44][45] . Also, to apply acoustic metasurfaces to outdoor environment with flow, proper theoretical and numerical frameworks need to be studied [46][47][48][49][50][51] .…”

Section: Discussionmentioning

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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“…acoustic cloaking), które czyni obiekty niewidzialnymi dla fali dźwiêkowej. Pierwsze publikacje na temat metamateria³ów akustycznych zaczê³y siê pojawiaae na pocz¹tku XXI w., a dotyczy³y przede wszystkim rozwa¿añ nad opisem matematycznym zachowania siê fali w metamateria³ach w ujêciu 2D [6]. Mo¿liwości opracowania tego rodzaju materia³ów przewidywano jednak wcześniej -w pracach teoretycznych, prowadzonych w drugiej po³owie XX w. Jedna z pierwszych publikacji przedstawiaj¹cych wyniki badañ meta-materia³u akustycznego [7] ukaza³a siê w 2000 r.…”

Section: Wstêpunclassified

Sprawdzenie przydatności metamateriału akustycznego do redukowania hałasu średnio- i wysokoczęstotliwościowego – symulacje numeryczne

Szczepański¹,

Podlesna²,

Lada³

et al. 2023

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Hałas na stanowiskach pracy wciąż jest głównym zagrożeniem dla pracowników zakładów przemysłowych. Zastosowanie obudów i barier dźwiękoizolacyjnych w celu ograniczania tego zagrożenia nie zawsze jest możliwe lub wystarczające. Stosunkowo nowym i obiecującym sposobem redukcji hałasu jest wykorzystanie metamateriałów akustycznych, które przekierowują bądź pochłaniają falę dźwiękową, a najwyższą skuteczność wykazują przy częstotliwości bliskiej częstotliwości rezonansowej. Metamateriały akustyczne służą przede wszystkim do redukcji hałasu wąskopasmowego. W artykule przedstawiono ich modele numeryczne, które posłużyły do wyznaczenia częstotliwości rezonansowych. Symulacje przeprowadzono w dwóch różnych programach przeznaczonych do analizy metodą elementów skończonych (MES). Otrzymane wyniki wskazują, że metamateriał o strukturze tunelowej z umieszczonymi wewnątrz rezonatorami Helmholtza może redukować hałas w kilku pasmach częstotliwości (w zakresie średnio- i wysokoczęstotliwościowym) oraz w większym stopniu niż metamateriał o strukturze tunelowej bez rezonatorów.

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Broadband sound absorption using multiple hybrid resonances of acoustic metasurfaces

Cited by 52 publications

References 57 publications

Effect of stacking order on the properties of hybrid palm sheath/polyester fiber felt‐reinforced polymer composite laminates

Effect of stacking order on the properties of hybrid palm sheath/polyester fiber felt‐reinforced polymer composite laminates

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

Sprawdzenie przydatności metamateriału akustycznego do redukowania hałasu średnio- i wysokoczęstotliwościowego – symulacje numeryczne

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