Flexural wave suppression by an acoustic metamaterial plate

Wang, Ting; Sheng, Meiping; Guo, Zhiwei; Qin, Qing Hua

doi:10.1016/j.apacoust.2016.07.023

Cited by 51 publications

(19 citation statements)

References 29 publications

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“…The vibration power flow of metamaterial plate was obtained by using the finite element method and the energy flow method, so as to reveal its vibration suppression mechanism. The lateral local resonance metamaterial structure proposed by Wang et al [48,49] can also suppress low frequency noise (see Figure 12). By analyzing the energy band structure diagram of the metamaterial, they found that the metamaterial plate could generate two low-frequency band gaps by the equivalent mass.…”

Section: Thin Film Acoustic Metamaterialsmentioning

confidence: 98%

A Review of Acoustic Metamaterials and Phononic Crystals

2020

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As a new kind of artificial material developed in recent decades, metamaterials exhibit novel performance and the promising application potentials in the field of practical engineering compared with the natural materials. Acoustic metamaterials and phononic crystals have some extraordinary physical properties, effective negative parameters, band gaps, negative refraction, etc., extending the acoustic properties of existing materials. The special physical properties have attracted the attention of researchers, and great progress has been made in engineering applications. This article summarizes the research on acoustic metamaterials and phononic crystals in recent decades, briefly introduces some representative studies, including equivalent acoustic parameters and extraordinary characteristics of metamaterials, explains acoustic metamaterial design methods, and summarizes the technical bottlenecks and application prospects.

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Section: Thin Film Acoustic Metamaterialsmentioning

confidence: 98%

A Review of Acoustic Metamaterials and Phononic Crystals

2020

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“…(24)- (25) into Eq. (19), the explicit solution of the displacement coefficient of the plate can be obtained as…”

Section: A Effective Parameters Of the Metamaterials Plate Via Effectmentioning

confidence: 99%

“…Recently, metamaterials, a kind of artificial structure, which enables unique properties not existing from basic structure, 16,17 have attracted much attention owing to its negative effective parameters and band gap properties. Within band gaps, flexural waves can be efficiently attenuated to achieve wave suppression and prohibition, 18,19 vibration isolation, and sound absorption. 20 It is an efficient and elegant approach for optimizing mechanical constituents by tailoring the dynamical behaviour of metamaterials with respect to vibration and acoustic control among others.…”

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confidence: 99%

Sound transmission loss through metamaterial plate with lateral local resonators in the presence of external mean flow

Wang

Sheng

Qin

2017

The Journal of the Acoustical Society of America

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In the context of sound incident upon a metamaterial plate, explicit formulas for sound transmission loss (STL) are derived in the presence of external mean flow. Metamaterial plate, consisting of homogeneous plate and lateral local resonators (LLRs), is homogenized by using effective medium method to obtain the effective mass density and facilitate the calculation of STL. Results show that (a) vigorously oscillating LLRs lead to higher STL compared with bare plate, (b) increasing Mach number of the external mean flow helps obtain higher STL below the coincidence frequency but decreases STL above the coincidence frequency due to the added mass effect of light fluid loading and aerodynamic damping effect, (c) the coincidence frequency shifts to higher frequency range for the refracted effect of the external mean flow. However, effects of the flow on STL within negative mass density range can be neglected because of the lateral local resonance occurring. Moreover, hysteretic damping from metamaterial can only smooth the transmission curves by lowering higher peaks and filling dips. Effects of incident angles on STL are also examined. It is demonstrated that increasing elevation angle can improve the sound insulation, while the azimuth angle does not.

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“…To the best of our knowledge, metamaterials also have some limitations, such as narrow optimal operating frequency bands, large spatial requirements owing to their repeating unit cells, and large energy losses owing to large impedance differences. [3][4][5][6][7] To overcome these limitations to make use of metamaterials in engineering applications, we can first refer to prior studies on this topic. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] The concepts of metamaterials were utilized to overcome the diffraction limits of ultrasonic and acoustic devices or superlenses.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the analogy between acoustic and electromagnetic waves from the mathematical point-of-view, and considering the kinematics and the energy balance of wave propagation, some researchers have attempted to identify left-handed acoustic metamaterials with negative mass densities and/or a negative elastic moduli. 1,4,23 Such acoustic negative refractive index applications vary from a simple sound barrier to a complex device for nondestructive health monitoring and measurement devices. If these attempts succeeded, the resolutions of acoustic and ultrasonic devices would have been significantly improved.…”

Section: Introductionmentioning

confidence: 99%

An Acoustic Hyperlens with Negative Direction Based on Double Split Hollow Sphere

Choi

Yoon

2019

J. Theor. Comp. Acout.

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This study develops a new acoustic negative-refraction metamaterial that utilizes a synthesized double split hollow sphere (DSHS) for its unit cell. Recent relevant research has affirmed the concept that acoustic metamaterials can show unusual behavior that has not been observed in nature previously. However, as some hypothetical metamaterial designs have material properties not found in nature, the realization of practical metamaterials requires practical and complicated models. As a contribution to the development of acoustic metamaterials, the present study proposes a new anisotropic unit structure that encompasses Helmholtz resonators. This structure is referred to as the DSHS, is easy to manufacture, and has the advantage in that it uses the natural medium in its original form. By drawing the equifrequency or isofrequency contours of the designed two-dimensional (2D) anisotropic unit structure using the Floquet–Bloch’s principle, the properties of the present metamaterial can be understood. Numerical simulations are also conducted to identify and present the characteristics of the presented acoustic metamaterial. Through these, a new refraction phenomenon is identified that deviates from Snell’s law, and an acoustic hyperlens is numerically implemented that overcomes the diffraction limit.

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Flexural wave suppression by an acoustic metamaterial plate

Cited by 51 publications

References 29 publications

A Review of Acoustic Metamaterials and Phononic Crystals

A Review of Acoustic Metamaterials and Phononic Crystals

Sound transmission loss through metamaterial plate with lateral local resonators in the presence of external mean flow

An Acoustic Hyperlens with Negative Direction Based on Double Split Hollow Sphere

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