The waveguiding of sound using lines of resonant holes

Ward, Gareth P.; Hibbins, Alastair P.; Sambles, J. R.; Smith, John David

doi:10.1038/s41598-019-47988-7

Cited by 10 publications

(11 citation statements)

References 23 publications

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“…Thus, the present theory can be readily adapted to other configurations where resonant slits are used to manipulate or absorb waves [12,13,24]. A similar approach could also be developed for three-dimensional hole resonators [25]. An analogous theory for acoustic Helmholtz resonators embedded in a wall and arrays thereof has recently been developed by two of us [20].…”

Section: Discussionmentioning

confidence: 94%

Boundary-layer effects on electromagnetic and acoustic extraordinary transmission through narrow slits

Brandão,

Holley,

Schnitzer

2020

Preprint

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We study the problem of resonant extraordinary transmission of electromagnetic and acoustic waves through subwavelength slits in an infinite plate, whose thickness is close to a half-multiple of the wavelength. We build on the matched-asymptotics analysis of Holley & Schnitzer (Wave Motion, 91 102381, 2019), who considered a single-slit configuration assuming an idealised formulation where dissipation is neglected and the electromagnetic and acoustic problems are analogous. We here extend that theory to include thin dissipative boundary layers associated with finite conductivity of the plate in the electromagnetic problem and viscous and thermal effects in the acoustic problem, considering both single-slit and slit-array configurations. By considering a distinguished boundary-layer scaling where dissipative and diffractive effects are comparable, we develop accurate analytical approximations that are generally valid near resonance; the electromagnetic-acoustic analogy is preserved up to a single physics-dependent parameter that is provided explicitly for both scenarios. The theory is shown to be in excellent agreement with GHz-microwave and kHz-acoustic experiments in the literature.

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Section: Discussionmentioning

confidence: 94%

Boundary-layer effects on electromagnetic and acoustic extraordinary transmission through narrow slits

Brandão,

Holley,

Schnitzer

2020

Preprint

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“…Thus, the present theory can be readily adapted to other configurations where resonant slits are used to manipulate or absorb waves [15,16,31]. A similar approach could also be developed for three-dimensional hole resonators [32]. An analogous theory for acoustic Helmholtz resonators embedded in a wall and arrays thereof has recently been developed by two of us [26].…”

Section: Discussionmentioning

confidence: 99%

Boundary-layer effects on electromagnetic and acoustic extraordinary transmission through narrow slits

2020

View full text Add to dashboard Cite

We study the problem of resonant extraordinary transmission of electromagnetic and acoustic waves through subwavelength slits in an infinite plate, whose thickness is close to a half-multiple of the wavelength. We build on the matched-asymptotics analysis of Holley & Schnitzer (2019 Wave Motion 91 , 102381 (doi:10.1016/j.wavemoti.2019.102381)), who considered a single-slit system assuming an idealized formulation where dissipation is neglected and the electromagnetic and acoustic problems are analogous. We here extend that theory to include thin dissipative boundary layers associated with finite conductivity of the plate in the electromagnetic problem and viscous and thermal effects in the acoustic problem, considering both single-slit and slit-array configurations. By considering a distinguished boundary-layer scaling where dissipative and diffractive effects are comparable, we develop accurate analytical approximations that are generally valid near resonance; the electromagnetic–acoustic analogy is preserved up to a single parameter that is provided explicitly for both scenarios. The theory is shown to be in excellent agreement with GHz-microwave and kHz-acoustic experiments in the literature.

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“…Both arrays had a depth D 21.4 mm into the page. Similar metasurface geometries have been studied in the literature with acoustic excitation and detection [13,14].…”

Section: Acoustic Metasurface Geometriesmentioning

confidence: 93%

Excitation of Airborne Acoustic Surface Modes Driven by a Turbulent Flow

Damani¹,

Devenport²,

Pearce³

et al. 2021

AIAA Journal

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This experiment demonstrates the generation of trapped acoustic surface waves excited by a turbulent flow source through the coupling of pressure fluctuations at the interface between an acoustic metamaterial and a flow environment. The turbulent flow, which behaves as a stochastic pressure source, was interfaced with an acoustic metasurface waveguide stationed in a quiescent environment via a single Kevlar-covered cavity, which ensured no significant disturbance to the flow. The metasurface waveguide produced an acoustic surface mode through evanescent diffractive coupling of the pressure field. This acoustic mode was trapped at the quiescent surface, with its mode dispersion determined by the surface geometry. The results of two different metasurface geometries are discussed: 1) a slotted cavity array, and 2) a meander connected cavity array, with each demonstrating a different trapped surface wave characteristic. Fourier transform and correlation analyses of spatially resolved temporal acoustic signals, measured close to the metamaterial surface, were used to construct the frequency-and wavevectordependent acoustic mode dispersion. The results demonstrate that the flow can be used to excite acoustic surface modes and that their mode dispersion may be tailored toward realizing novel control of turbulent flow through acoustic-flow interactions.

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The waveguiding of sound using lines of resonant holes

Cited by 10 publications

References 23 publications

Boundary-layer effects on electromagnetic and acoustic extraordinary transmission through narrow slits

Boundary-layer effects on electromagnetic and acoustic extraordinary transmission through narrow slits

Boundary-layer effects on electromagnetic and acoustic extraordinary transmission through narrow slits

Excitation of Airborne Acoustic Surface Modes Driven by a Turbulent Flow

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