Sound attenuation by sculpture

Martínez‐Sala, R.; Sancho, Juan; Sánchez, José-María; Gómez, Vicente; Lull, Cristina; Meseguer, F.

doi:10.1038/378241a0

Cited by 735 publications

(449 citation statements)

References 4 publications

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“…Simple phononic crystals involving periodic arrays of cylinders have been shown to exhibit wave filtering behavior. Mártinez-Sala et al (1995) introduced an investigation into the sound attenuation achieved by a sculpture in Madrid, and this was more formally presented by Sánchez-Pérez et al (1998) with an experimental analysis of a two-dimensional periodic array of rigid stainless steel cylinders. When these periodic composite materials interact with acoustic waves, they exhibit wave filtering behavior, creating band gaps or stop bands within the frequency spectrum.…”

Section: Introductionmentioning

confidence: 99%

Investigation of elastic wave transmission in a metaconcrete slab

Mitchell

Pandolfi

Ortiz

2015

Mechanics of Materials

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a b s t r a c tA new type of modified concrete, termed metaconcrete, has been shown to exhibit trapping of wave energy and a reduction in mortar stress when subjected to dynamic loading. Metaconcrete replaces the standard stone and gravel aggregates of regular concrete with spherical inclusions consisting of a heavy core coated with a compliant outer layer. These new layered aggregates resonate at designed frequencies by allowing for relative motion between the heavy core and the mortar matrix, which causes the aggregate to absorb energy and therefore reduce stress within the mortar phase of the composite material. The transmission of wave energy through a metaconcrete slab can be used to visualize the effect of resonant behavior within the metaconcrete aggregates. To quantify this behavior we compute a transmission coefficient, which is a method of measuring the absorption of wave energy as an applied forcing of known frequency travels through the material. The transmission coefficient is plotted against forcing frequency for four different aggregate material and geometry configurations. A reduction in transmission ratio is observed at or near the computed natural modes of the aggregate, indicating the activation of resonance within the inclusions. This behavior is consistent with observations from studies on sonic metamaterials containing resonant inclusions with a similar layered structure. The frequency location and width of the dip in transmission coefficient will aid in the design of metaconcrete aggregates for specific forcing applications.

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Section: Introductionmentioning

confidence: 99%

Investigation of elastic wave transmission in a metaconcrete slab

Mitchell

Pandolfi

Ortiz

2015

Mechanics of Materials

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“…Over the past two decades, propagation of elastic waves in phononic crystal (PC) plates has attracted much attention due to their unique dynamic properties such as negative refraction [1], stop-band filtering [2], cloaking [3], among the other unconventional properties. PC plates are generally made of periodically 5 distributed inclusions in a hosting material (matrix) and, depending on the physical nature of the components, can be classified in solid-solid, fluid-fluid and mixed solid-fluid composite systems [4].…”

Section: Introductionmentioning

confidence: 99%

Band structure analysis of leaky Bloch waves in 2D phononic crystal plates

Mazzotti¹,

Miniaci²,

Bartoli³

2017

Ultrasonics

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A hybrid Finite Element-Plane Wave Expansion method is presented for the band structure analysis of phononic crystal plates with two dimensional lattice that are in contact with acoustic half-spaces. The method enables the computation of both real (propagative) and imaginary (attenuation) components of the Bloch wavenumber at any given frequency.Three numerical applications are presented: a benchmark dispersion analysis for an oil-loaded Titanium isotropic plate, the band structure analysis of a waterloaded Tungsten slab with square cylindrical cavities and a phononic crystal plate composed of Aurum cylinders embedded in an epoxy matrix.

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“…In the normal incident case, the characteristics of the PBGs and defect modes, closely depend on the optical properties of the constituted layers and defect layer. The existence of the PBG and defect modes in the optical spectrum (Reflectance, Absorptance or Transmittance) of the PC have leaded to many interesting phenomena and numerous applications of PCs in improving the performance of optoelectronic and microwave devices such as high-efficiency semiconductor lasers, light emitting diodes, wave guides, high-Q resonators, antennas, all-optical diodes and filters, frequency selective surface, optical limiters and amplifiers [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Designing Plane Wave Modulators Using 1dpc Nanostructure With R-Grin Defect Layer

Jamshidi‐Ghaleh¹,

Bayat²

2014

PIER M

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Abstract-In this paper, we introduce plane wave modulators that are designed using one-dimensional photonic crystals (1DPC) containing radial gradient refractive index (r-GRIN) defect layers. Three kinds of r-GRIN materials with different refractive index distribution functions are applied in numerical analysis. The properties of the phase and intensity of the transmitted plane wave beam through proposed structures are studied using the transfer matrix method. Radially-dependent defect modes, modulated phase and intensity are obtained according to the refractive index distribution functions. The results are predictable by regarding the Bragg condition and destructive interference, which are the origins of the photonic band gap (PBG). Due to the radial-dependency of the defect layer's refractive index, the rays passing through different transverse positions experience different optical pathways. Therefore, the defect modes and transmitted spectrum (phase and amplitude) vary transversely. This study demonstrates another ability of the artificial PC structures to design plane wave modulators and manipulate its phase and intensity.

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Sound attenuation by sculpture

Cited by 735 publications

References 4 publications

Investigation of elastic wave transmission in a metaconcrete slab

Investigation of elastic wave transmission in a metaconcrete slab

Band structure analysis of leaky Bloch waves in 2D phononic crystal plates

Designing Plane Wave Modulators Using 1dpc Nanostructure With R-Grin Defect Layer

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