Wave attenuation mechanism in an acoustic metamaterial with negative effective mass density

Huang, Haibo; Sun, C. T.

doi:10.1088/1367-2630/11/1/013003

Cited by 344 publications

(212 citation statements)

References 16 publications

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“…Wang et al improved it with a better estimation of equivalent parameters and extended it to predict the lower and upper edges of resonant gaps for two and three dimensional LRSMs [9]. Recently, Huang et al devoted to studying the double negativity, the band gap and the wave attenuation of an infinite mass-in-mass lattice model [32,33]. However, few studies have considered using a mechanical analogue to investigate the sound absorption performance of the LRSM.…”

Section: Introductionmentioning

confidence: 99%

A Parametric Analysis on the Sound Absorbing Performance of the Locally Resonant Sonic Material Using a Mass-Damper-Spring Model

Yuan¹

2016

AJPA

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Abstract:The locally resonant sonic material (LRSM) is a kind of structural composite. Such composite typically consists of an elastic matrix periodically embedded with metallic spheres, which are coated with soft rubber. Owing to its capability of controlling the low frequency sound, the LRSM has a promising prospect in the application of underwater acoustic materials. This paper proposes a mass-damper-spring model to explain the sound absorbing mechanism of the LRSM, and derives analytical formulae to evaluate the absorbing performance. After reasonable simplification, the analytical formulae can intuitively illustrate the relationship between the absorbing performance and the parameters of the LRSM. The correctness of the physical model was verified by comparing the analytical evaluation with the numerical result calculated by the layer-multiple-scattering method. The result shows that the sound absorption of the LRSM is induced by the energy dissipation of the damped local resonator subjected to excitations. The influence of the parameters on the absorbing performance of the LRSM is analysed systematically. It is shown that a resonator with a heavier core and a stiffer coat can produce a better sound absorbing performance.

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Section: Introductionmentioning

confidence: 99%

A Parametric Analysis on the Sound Absorbing Performance of the Locally Resonant Sonic Material Using a Mass-Damper-Spring Model

Yuan¹

2016

AJPA

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“…Metamaterials are phononic crystals that can be micro-architecturally designed for high stress-wave attenuation (Liu et al, 2000;Ho et al, 2003;Cheng et al, 2008;Huang and Sun, 2009). They have overall mechanical properties that are not shared by traditional engineering materials (Guenneau et al, 2007;Torrent and Sanchez-Dehesa, 2007;Milton and Willis, 2007;Torrent and Sanchez-Dehesa, 2008).…”

Section: Introductionmentioning

confidence: 99%

Phononic layered composites for stress-wave attenuation

Nemat‐Nasser

Sadeghi

Amirkhizi

et al. 2015

Mechanics Research Communications

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The aim is to design a layered metamaterial with high attenuation coefficient and high in-plane stiffnessto-density ratio using homogenization to calculate and optimize the dynamic effective stiffness and mass density of layered periodic composites (phononic layers) over a broad frequency band. This is achieved by: (1) minimizing the frequency range of the first pass band, (2) maximizing the frequency range of the stop band, and (3) creating local resonance over the second pass band. To verify the theoretical calculation, laboratory samples were fabricated and their attenuation coefficient were measured and compared with the theoretical results. It is observed that over 4 to 20 kHz frequency range the attenuation per unit length in the optimally designed composite can exceed 500 dB/m; which increases with increasing frequency. A dynamic Ashby chart, depicting attenuation coefficient vs. in-plane stiffness-todensity ratio, is presented for various engineering materials and is compared with the fabricated metamaterial to show the significance of our design. This method can be used in variety of applications for stress wave management, e.g., in addition to match the impedance of the resulting composite to that of its surrounding medium to minimize (or essentially eliminate) stress wave reflection.

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“…10 The conversion to the evanescent wave is the road to soundproofing. 11 The separation between medium and sound has been successfully demonstrated. The key is the Helmholtz resonators or its applications.…”

Section: Introductionmentioning

confidence: 99%

Air transparent soundproof window

Kim

Lee

2014

AIP Advances

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A soundproof window or wall which is transparent to airflow is presented. The design is based on two wave theories of diffraction and acoustic metamaterials. It consists of a three-dimensional array of strong diffraction-type resonators with many holes centered at each individual resonator. The acoustic performance levels of two soundproof windows with air holes of 20mm and 50mm diameters were measured. Sound waves of 80dB in the frequency range of 400 − 5, 000Hz were applied to the windows. It was observed that the sound level was reduced by about 30 − 35dB in the above frequency range with the 20mm window and by about 20 − 35dB in the frequency range of 700 − 2, 200Hz with the 50mm window. It is an extraordinary acoustic anti-transmission. The geometric factors which produced the effective negative modulus were obtained.

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Wave attenuation mechanism in an acoustic metamaterial with negative effective mass density

Cited by 344 publications

References 16 publications

A Parametric Analysis on the Sound Absorbing Performance of the Locally Resonant Sonic Material Using a Mass-Damper-Spring Model

A Parametric Analysis on the Sound Absorbing Performance of the Locally Resonant Sonic Material Using a Mass-Damper-Spring Model

Phononic layered composites for stress-wave attenuation

Air transparent soundproof window

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