Control of noise by trees arranged like sonic crystals

Martínez‐Sala, R.; Rubio, Constanza; Garcı́a-Raffi, L. M.; Sánchez‐Pérez, J. V.; Pérez, Enrique Alfonso Sánchez; Lull, Cristina

doi:10.1016/j.jsv.2005.05.030

Cited by 104 publications

(52 citation statements)

References 12 publications

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“…Bandgaps, inhibiting wave propagation inside certain frequency bands of SCs, have been used for wave filtering and noise reduction. [1][2][3][4][5] A negative effective refraction index within the second band leads to a sub-wavelength focusing effect when flat lenses are used. [6][7][8][9][10][11] The self-collimation effect has been shown to facilitate acoustic wave propagation inside SCs, with little diffraction.…”

Section: Introductionmentioning

confidence: 99%

Sonic crystal acoustic switch device

Alagoz¹,

Alagöz²

2013

The Journal of the Acoustical Society of America

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This study reports a wave-controlled sonic crystal switch device that exhibits a destructive interference-based wave to wave reverse switching effect. By applying control waves, this acoustic device, composed of a two-dimensional square lattice sonic crystal block, reduces acoustic wave transmission from input to output. The finite difference time domain simulation and experimental results confirm the wave-to-wave reverse switching effect at the peak frequencies of the second band. The proposed sonic crystal switch prototype provides a contrast rate of 86% at 11.3 kHz frequency. This wave-to-wave switching effect is useful for controlling wave propagation for smart structure applications.

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Section: Introductionmentioning

confidence: 99%

Sonic crystal acoustic switch device

Alagoz¹,

Alagöz²

2013

The Journal of the Acoustical Society of America

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“…Another possibility is that they could be formed from trees, since trees can be arranged in periodic arrays. Hence useful noise control could be achieved by natural means 3 . A 7.2m long, 11m wide periodic (triangular) array of hollow cylindrical PVC rods with diameter 16cm and with an array filling fraction, i.e.…”

Section: Introductionmentioning

confidence: 99%

Effects of porous covering on sound attenuation by periodic arrays of cylinders

Umnova

Attenborough

Linton

2006

The Journal of the Acoustical Society of America

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The acoustic transmission loss of a finite periodic array of long rigid cylinders, without and with porous absorbent covering, is studied both theoretically and in the laboratory. A multiple scattering model is extended to allow for the covering and its acoustical properties are described by a single parameter semi-empirical model. Data from laboratory measurements and numerical results are found to be in reasonable agreement. These data and predictions show that porous covering reduces the variation of transmission loss with frequency due to the stop/pass band structure observed with an array of rigid cylinders with similar overall radius and improves the overall attenuation in the higher frequency range. The predicted sensitivities to covering thickness and effective flow resistivity are explored. It is predicted that a random covered array also gives better attenuation than a random array of rigid cylinders with the same overall radius and volume fraction. Porous covering in arrays of cylinders2

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“…In recent research about photonic, phononic and sonic crystals, band gaps were observed in the band structure characteristics of crystals with various lattice geometries [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. As crystal structures exhibit very low transmission in the frequencies within band gaps, they were also referred to as "stop bands."…”

Section: Introductionmentioning

confidence: 99%

“…Band gap properties of crystal structures have been used practically in the application of wave isolation in a selected frequency band [5,6,8,18,19]. In a similar fashion, we numerically investigate crystal structures built on the ground in order to attenuate the longitudinal ground vibrations propagating on the surface of the earth by means of band gaps.…”

Section: Introductionmentioning

confidence: 99%

Towards Earthquake Shields: A Numerical Investigation of Earthquake Shielding with Seismic Crystals

Alagöz¹,

Alagoz²

2011

OJA

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Authors numerically demonstrate that the seismic surface waves from an earthquake can be attenuated by a seismic crystal structure constructed on the ground. In the study, seismic crystals with a lattice constant of kilometer are investigated in the aspect of band gaps (Stop band), and some design considerations for earthquake shielding are discussed for various crystal configurations in a theoretical manner. Authors observed in their FDTD based 2D wave simulation results that the proposed earthquake shield can provide a decreasing in magnitude of surface seismic waves. Such attenuation of seismic waves might reduce the damage in an earthquake.

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Control of noise by trees arranged like sonic crystals

Cited by 104 publications

References 12 publications

Sonic crystal acoustic switch device

Sonic crystal acoustic switch device

Effects of porous covering on sound attenuation by periodic arrays of cylinders

Towards Earthquake Shields: A Numerical Investigation of Earthquake Shielding with Seismic Crystals

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