Standardised acoustic characterisation of sonic crystals noise barriers: Sound insulation and reflection properties

Morandi, Federica; Miniaci, Marco; Marzani, Alessandro; Barbaresi, Luca; Garai, Massimo

doi:10.1016/j.apacoust.2016.07.028

Cited by 86 publications

(69 citation statements)

References 30 publications

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“…As far as phononic crystals and mechanical metamaterials are concerned, regrettably, their introduction into the current technology appears less advanced, although many potential applications of practical implementation have already been proposed: from seismic protection [11,34] to environmental noise reduction [33,36], from sub-wavelength imaging to focusing [4], acoustic cloaking [35] and even thermal control [31].…”

Section: Introductionmentioning

confidence: 99%

Modeling Phononic Crystals via the Weighted Relaxed Micromorphic Model with Free and Gradient Micro-Inertia

Madeo

Collet

Miniaci

et al. 2017

J Elast

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In this paper the relaxed micromorphic continuum model with weighted free and gradient micro-inertia is used to describe the dynamical behavior of a real two-dimensional phononic crystal for a wide range of wavelengths. In particular, a periodic structure with specific micro-structural topology and mechanical properties, capable of opening a phononic band-gap, is chosen with the criterion of showing a low degree of anisotropy (the band-gap is almost independent of the direction of propagation of the traveling wave). A Bloch wave analysis is performed to obtain the dispersion curves and the corresponding vibrational modes of the periodic structure. A linear-elastic, isotropic, relaxed micromorphic model including both a free micro-inertia (related to free vibrations of the microstructures) and a gradient micro-inertia (related to the motions of the microstructure which are coupled to the macro-deformation of the unit cell) is introduced and particularized to the case of plane wave propagation. The parameters of the relaxed model, which are independent of frequency, are then calibrated on the dispersion curves of the phononic crystal showing an excellent agreement in terms of both dispersion curves and vibrational modes. Almost all the homogenized elastic parameters of the relaxed micromorphic model result to be determined. This opens the way to the design of morphologically complex meta-structures which make use of the chosen phononic structure as the basic building block and which preserve its ability of "stopping" elastic wave propagation at the scale of the structure.

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Section: Introductionmentioning

confidence: 99%

Modeling Phononic Crystals via the Weighted Relaxed Micromorphic Model with Free and Gradient Micro-Inertia

Madeo

Collet

Miniaci

et al. 2017

J Elast

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show abstract

“…One of the main problems facing physicist and engineers working in the field of metamaterials is to achieve vibration damping and control over large, low frequency ranges. This is true in fields ranging from noise absorption [1][2][3][4] to seismic wave abatement [5,6]. Phononic crystals (PCs) and acoustic metamaterials (AMMs), generally made of periodically distributed inclusions in a matrix (or hosting material), are of particular interest because of their ability to act as stop-band filters, i.e.…”

Section: Introductionmentioning

confidence: 99%

Experimental Observation of a Large Low-Frequency Band Gap in a Polymer Waveguide

et al. 2018

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The quest for large and low frequency band gaps is one of the principal objectives pursued in a number of engineering applications, ranging from noise absorption to vibration control, to seismic wave abatement. For this purpose, a plethora of complex architectures (including multi-phase materials) and multi-physics approaches have been proposed in the past, often involving difficulties in their practical realization.To address this issue, in this work we propose an easy-to-manufacture design able to open large, low frequency complete Lamb band gaps exploiting a suitable arrangement of masses and stiffnesses produced by cavities in a monolithic material. The performance of the designed structure is evaluated by numerical simulations and confirmed by Scanning Laser Doppler Vibrometer (SLDV) measurements on an isotropic polyvinyl chloride plate in which a square ring region of cross-like cavities is fabricated. The full wave field reconstruction clearly confirms the ability of even a limited number of unit cell rows of the proposed design to efficiently attenuate Lamb waves. In addition, numerical simulations show that the structure allows to shift of the central frequency of the BG through geometrical modifications. The design may be of interest for applications in which large BGs at low frequencies are required.

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“…At the same time, this method is purely analytical, based on known solutions of the wave equation. This circumstance has an unquestionable advantage over numerical methods, such as the method of boundary areas and the method of finite elements [16][17][18], in which the accuracy of obtained results is unknown and can be found only at the stage of experimental verification.…”

Section: Dependence Of Efficiency Of the Screen On The Size Of Thementioning

confidence: 99%

“…The most widely used methods are those of boundary areas and finite elements [16][17][18]. It was shown that the method of boundary areas can be applied to any geometrical system with arbitrary boundary conditions.…”

Section: Investigation Of the Efficiency Of A Noise Protection Screenmentioning

confidence: 99%

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Investigation of the efficiency of a noise protection screen with an opening at its base

Zaets

Kotenko

2017

EEJET

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Standardised acoustic characterisation of sonic crystals noise barriers: Sound insulation and reflection properties

Cited by 86 publications

References 30 publications

Modeling Phononic Crystals via the Weighted Relaxed Micromorphic Model with Free and Gradient Micro-Inertia

Modeling Phononic Crystals via the Weighted Relaxed Micromorphic Model with Free and Gradient Micro-Inertia

Experimental Observation of a Large Low-Frequency Band Gap in a Polymer Waveguide

Investigation of the efficiency of a noise protection screen with an opening at its base

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