Special Issue "Advances in Acoustic Metamaterials"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: 31 December 2020.

Special Issue Editors

Dr. Marco Miniaci
Website
Guest Editor
EMPA, Laboratory of Acoustics and Noise Control, Switzerland
Interests: topological insulators; phononic crystals and metamaterials; elastic wave propagation; structural health monitoring and non-destructive testing
Dr. Federico Bosia
Website
Guest Editor
Department of Physics, University of Torino, Italy
Interests: mechanical modeling; wave dynamics; bioinspired materials

Special Issue Information

Dear Colleagues,

Architected periodic structures like phononic crystals and elastic metamaterials offer unprecedented opportunities for elastic wave manipulation, unachievable using traditional homogeneous materials. Since their introduction, these structures have been exploited to generate effects like frequency band-gaps, negative refraction, topological protection, non-reciprocal propagation, etc. In parallel, recent advances in material science and technology, including additive manufacturing, have allowed the practical realization of a huge variety of novel complex structures at various different length scales, leading to additional application opportunities in the field of wave control, focusing and collimation, environ-mental noise reduction, and even earthquake protection. The fast growth of the topic and increasing interest in the field from researchers with expertise in the areas of material science and beyond are the main reasons for this Special Issue on “Advances in Acoustic Metamaterials”. Contributions should focus on new achievements, both theoretical and experimental, relative to the dynamics of phononic crystals and metamaterials, related (but not limited) to effects such as negative refraction, stop-band filtering, cloaking, focusing, energy harvesting, topological states, etc.

The issue is intended to provide a platform for researchers working in the field to disseminate their ideas on the design and characterization of new configurations, highlighting novel dynamic phenomena and exploring additional promising applications. It should also stimulate a cross-fertilization between researchers of the field with other readers of the journal, providing the opportunity to find new potential research directions.

Dr. Marco Miniaci
Dr. Federico Bosia
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Phononic crystals
  • Acoustic and Elastic Metamaterials
  • Waves and Vibrations
  • Frequency Bandgaps
  • Wave Control
  • Topological Insulators

Published Papers (3 papers)

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Research

Open AccessFeature PaperArticle
Exponentially Complex “Classically Entangled” States in Arrays of One-Dimensional Nonlinear Elastic Waveguides
Materials 2019, 12(21), 3553; https://doi.org/10.3390/ma12213553 - 29 Oct 2019
Cited by 2
Abstract
We demonstrate theoretically, using multiple-time-scale perturbation theory, the existence of nonseparable superpositions of elastic waves in an externally driven elastic system composed of three one-dimensional elastic wave guides coupled via nonlinear forces. The nonseparable states span a Hilbert space with exponential complexity. The [...] Read more.
We demonstrate theoretically, using multiple-time-scale perturbation theory, the existence of nonseparable superpositions of elastic waves in an externally driven elastic system composed of three one-dimensional elastic wave guides coupled via nonlinear forces. The nonseparable states span a Hilbert space with exponential complexity. The amplitudes appearing in the nonseparable superposition of elastic states are complex quantities dependent on the frequency of the external driver. By tuning these complex amplitudes, we can navigate the state’s Hilbert space. This nonlinear elastic system is analogous to a two-partite two-level quantum system. Full article
(This article belongs to the Special Issue Advances in Acoustic Metamaterials)
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Open AccessArticle
Sound Insulation and Reflection Properties of Sonic Crystal Barrier Based on Micro-Perforated Cylinders
Materials 2019, 12(17), 2806; https://doi.org/10.3390/ma12172806 - 31 Aug 2019
Cited by 2
Abstract
A sonic crystal barrier, consisting of empty micro-perforated cylindrical shells, was built on the campus at the Universitat Politècnica de València in 2011 and characterised by using a non-standardised measurement technique. In this paper, the sonic crystal barrier, upgraded with rubber crumb inside [...] Read more.
A sonic crystal barrier, consisting of empty micro-perforated cylindrical shells, was built on the campus at the Universitat Politècnica de València in 2011 and characterised by using a non-standardised measurement technique. In this paper, the sonic crystal barrier, upgraded with rubber crumb inside the micro-perforated cylindrical shells, was characterised by using standardised measurement techniques according to EN 1793-5 and EN 1793-6. As a result of the characterisation, sound insulation properties of the barrier were shown to be a combination of the absorptive properties of the individual building units and the reflective properties of their periodic distribution. In addition, its performance was compared with a similar barrier consisting of rigid polyvinyl chloride (PVC) cylinders, which was recently characterised using the same standardised techniques. In comparison with the barrier based on PVC cylinders, the barrier investigated here produced a broadband enhancement of the sound insulation and lower reflection indices in the targeted frequency range. It was also shown that the influence of leakage under the barrier and the width of the temporal window on sound insulation was negligible. While EN 1793-5 and 1793-6 allow a direct comparison of the performance of different noise barriers, the applicability to this new type of barriers requires further investigation. Full article
(This article belongs to the Special Issue Advances in Acoustic Metamaterials)
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Open AccessArticle
Mutual Inductance and Coupling Effects in Acoustic Resonant Unit Cells
Materials 2019, 12(9), 1558; https://doi.org/10.3390/ma12091558 - 13 May 2019
Cited by 2
Abstract
We present an acoustic metamaterial (AMM) consisting of a dumbbell-shaped split hollow sphere (DSSHS). Transmission results of experiments and simulations both presented a transmitted dip at the resonant frequency of AMM, which demonstrated its negative modulus property. As the two split holes in [...] Read more.
We present an acoustic metamaterial (AMM) consisting of a dumbbell-shaped split hollow sphere (DSSHS). Transmission results of experiments and simulations both presented a transmitted dip at the resonant frequency of AMM, which demonstrated its negative modulus property. As the two split holes in the DSSHS had strong coupling effects for the acoustic medium in the local region, the dip could be simply manipulated by tuning the distance between the split holes. When the distance was large enough, the mutual inductance tended to disappear, and a weak interaction existed in the structure. According to the property of weak interaction, a multiband AMM and a broadband AMM with a negative modulus could be achieved by arraying DSSHS clusters with different distances. Furthermore, mutual inductance and coupling in DSSHS reinforced the local resonance, and this kind of cell could be used to design the acoustic metasurface to abnormally control the refractive waves. Full article
(This article belongs to the Special Issue Advances in Acoustic Metamaterials)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Author: Massimo Ruzzene
Affiliation: Georgia Institute of Technology, USA

Author: Jose Sanchez-Dehesa
Affiliation: Universitat Politècnica de València, Spain

Author: Pierre A Deymier
Affiliation: University of Arizona, Tucson, USA

Author: Andrea Bergamini
Affiliation: EMPA, Switzerland

Author: Marco Miniaci 
Affiliation: EMPA, Laboratory of Acoustics and Noise Control, Switzerland

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