Acoustic Attenuation of Hybrid Sonic Crystal Made with Periodic Cylindrical Scatterers and Porous Panels

Mohapatra, Karisma; Jena, D.P.

doi:10.1007/s40857-021-00239-0

Cited by 8 publications

(7 citation statements)

References 21 publications

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“…Tunability can be achieved by changing the geometry of the inclusions or by varying the elastic characteristics of the constitutive components through the application of contact and noncontact external stimuli. 9 The findings for the three-component system indicate that the softer material coating can be used as a potential alternative to tune and control the acoustic metamaterials.…”

Section: Discussionmentioning

confidence: 96%

“…Bragg’s scattering capitalises the destructive interference of the propagating wave caused by the multiple scattering from the periodically arranged scatterers in the air matrix. 8–10,12–14…”

Section: Introductionmentioning

confidence: 99%

“…This principle capitalises the constructive interference, whereby propagating wave is coupled with the local resonance of the scatterers. 7–10,12–14…”

Section: Introductionmentioning

confidence: 99%

“…3,4 The basic idea in their design is that a solid periodic modulation in density or sound velocity can create spectral gaps that forbid wave propagation. [5][6][7][8][9][10] Two important principles that contribute to achieving this idea in metamaterials are Bragg's scattering and locally resonant structures.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation on 2D metamaterial under normal incidence

2023

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Investigations in solid-state physics show that metamaterials, a kind of periodic material, can produce a band of frequency gap. When a sonic wave’s frequency falls into this frequency gap, it cannot propagate. Enlightened by the concept of frequency gap, researchers recently investigated various metamaterials. The search for bandgap(s) is critical in such innovations. The present letter presents the analysis of the band of frequency gap(s) for two and three-component systems as 2D period materials using the Finite Element Method. The investigation highlights the influence of geometrical parameters on the bandgap. Modelled metamaterial uses a core of aluminium, a coating of natural rubber and a matrix of air. For the lattice constant’s specified value, with the core’s increasing size, the bandgap shows to increase. The general effect of the coating leads to the flattening of the dispersion curve. For the square lattice and circular core, the bandgap appears around a net core size (with and without coating) of around 30%–32% of the lattice constant. Multiple frequency bandgaps appear of substantial sizes at the core’s threshold size, that is, when the core’s net radius is equal to half of the lattice constant. The softer material coating is found as a potential alternative to tune and control acoustic metamaterials. With a three-component system, bandgaps appear comparatively at significantly lower frequencies. Lower edge frequencies for such bandgaps are found to be independent of the core and coating size.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

“…This principle capitalises the constructive interference, whereby propagating wave is coupled with the local resonance of the scatterers. 7–10,12–14…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical investigation on 2D metamaterial under normal incidence

2023

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“…For the reference, other experimental studies also have been performed using portable anechoic chamber. [26][27][28] (b) The sound pressure has been measured with PCB© free field array microphone. The calibration of the microphone has been carried out with an L&D© class one calibrator with (model no CAL-200©).…”

Section: Experimentationmentioning

confidence: 99%

Numerical and experimental methods to measure the acoustic performance of sonic crystal noise barrier

Mohapatra

Jena

2023

Building Acoustics

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The array of periodic scatterers is known as sonic crystal at present and sonic crystal is the most cost-effective solution for a “noise barrier” because of its acoustic attenuation due to size, geometry, and periodic arrangement of scatterers. The simulation methods to estimate acoustic attenuation and the Bragg band of the periodic scatterers have been demonstrated in this paper. First, the periodic cylindrical and C-shaped scatterers have been studied along with the effect of thermo-viscous losses to establish the simulation method. Next, in the laboratory environment, the measurements have been carried out for periodic cylindrical and C-shaped scatterers and the experimental results are in good agreement with simulation results.

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