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Crystals
Special Issues
Applications of Phononic Crystals & Acoustic Metamaterials
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Applications of Phononic Crystals & Acoustic Metamaterials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Hybrid and Composite Crystalline Materials".

Deadline for manuscript submissions: closed (20 January 2024) | Viewed by 8639

Special Issue Editors

Prof. Dr. Zhimiao Yan

E-Mail Website
Guest Editor
School of Naval Architecture, Shanghai Jiao Tong University, Shanghai 200030, China
Interests: smart materials and structures; acoustic metamaterials; nonlinear vibration and control; vibrational energy harvesting
Dr. Ting Tan

E-Mail Website
Guest Editor
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
Interests: piezoelectric energy harvesting; phononic crystal; metamaterial

Special Issue Information

Dear Colleagues,

Phononic crystals, as an artificial extension of electronic crystals in nature, are also known as acoustic band-gap materials, which are functional composites with a certain space period. Inside the phononic crystals, the elastic constants and mass densities of the material parameters vary periodically in space. The connected part is the matrix, and the disconnected part is the scatterer. The material properties of the matrix and the scatterer may be solid, gas, or liquid. According to their structural forms, they can be divided into one-dimensional, two-dimensional and three-dimensional systems, and the corresponding scatterers are layered plates, cylinders, and particles, respectively. The planar arrangement of cylinder scatterers can be a simple lattice, such as a tetragonal lattice, a rectangular lattice, or a triangular lattice, or a complex lattice, such as a hexagonal lattice, a kagome lattice, or an Archimedes lattice. The spatial lattice structure of particle scatterers can be simple cube, central cube, volume central cube, etc. The minimum periodic size of phononic crystal is a lattice constant, and the minimum unit of the periodic structure is a single cell. Due to the abundant and extraordinary properties of phononic crystals, there has been a growing amount of research interest in phononic crystals within academia and the polymer industry.

Research involving novel formulation and fabrication techniques, characterization, and potential applications of phononic crystals in many industrial fields is of particular importance today. Phononic crystals and acoustic metamaterials are used as functional materials in sustainable energy-harvesting-related applications (e.g., sensors, batteries for IoTs, etc.), vibration reduction applications, and in the development of lightweight engineered products with superior mechanical properties, to name a few. In this context, the importance of this Special Issue on phononic crystals and acoustic metamaterials to highlight recent progress in the phononic crystals and acoustic metamaterials research area becomes clear.

This Special Issue titled “Applications of Phononic Crystals & Acoustic Metamaterials” offers a broad scope of recent studies on novel phononic crystals and acoustic metamaterials, formulation, fabrication, characterization, structure–property relationships, and their applications. All of the keywords mentioned below are simply examples that showcase the variety of acceptable topics and do not serve to limit the scope of this Special Issue. As such, authors are highly encouraged to submit papers on these topics and others that are linked to the general focus of the Special Issue. Furthermore, the Special Issue aims to highlight the challenges, future research scope, and novel applications of phononic crystals and acoustic metamaterials, which can also be in the form of a short review.

Prof. Zhimiao Yan
Dr. Ting Tan
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 submissions that pass pre-check are 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. Crystals is an international peer-reviewed open access monthly 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 2600 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

  • Periodic artificial structure
  • Phononic crystals
  • Acoustic metamaterials
  • Elastic wave control
  • Reduction of vibration and noise
  • Energy harvesting

Published Papers (3 papers)

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Research

13 pages, 5155 KiB  
Article
Tunable Low Frequency Band Gap and Waveguide of Phononic Crystal Plates with Different Filling Ratio
by Shaobo Zhang, Jiang Liu, Hongbo Zhang and Shuliang Wang
Crystals 2021, 11(7), 828; https://doi.org/10.3390/cryst11070828 - 16 Jul 2021
Cited by 3 | Viewed by 2099
Abstract
Aiming at solving the NVH problem in vehicles, a novel composite structure is proposed. The new structure uses a hollow-stub phononic-crystal with filled cylinders (HPFC) plate. Any unit in the plate consists of a lead head, a silicon rubber body, an aluminum base [...] Read more.
Aiming at solving the NVH problem in vehicles, a novel composite structure is proposed. The new structure uses a hollow-stub phononic-crystal with filled cylinders (HPFC) plate. Any unit in the plate consists of a lead head, a silicon rubber body, an aluminum base as outer column and an opposite arranged inner pole. The dispersion curves are investigated by numerical simulations and the influences of structural parameters are discussed, including traditional hollow radius, thickness, height ratio, and the new proposed filling ratio. Three new arrays are created and their spectrum maps are calculated. In the dispersion simulation results, new branches are observed. The new branches would move towards lower frequency zone and the band gap width enlarges as the filling ratio decreases. The transmission spectrum results show that the new design can realize three different multiplexing arrays for waveguides and also extend the locally resonant sonic band gap. In summary, the proposed HPFC structure could meet the requirement for noise guiding and filtering. Compared to a traditional phononic crystal plate, this new composite structure may be more suitable for noise reduction in rail or road vehicles. Full article
(This article belongs to the Special Issue Applications of Phononic Crystals & Acoustic Metamaterials)
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15 pages, 3413 KiB  
Article
A Phononic Crystal with Differently Configured Double Defects for Broadband Elastic Wave Energy Localization and Harvesting
by Soo-Ho Jo and Byeng D. Youn
Crystals 2021, 11(6), 643; https://doi.org/10.3390/cryst11060643 - 05 Jun 2021
Cited by 25 | Viewed by 3806
Abstract
Several previous studies have been dedicated to incorporating double defect modes of a phononic crystal (PnC) into piezoelectric energy harvesting (PEH) systems to broaden the bandwidth. However, these prior studies are limited to examining an identical configuration of the double defects. Therefore, this [...] Read more.
Several previous studies have been dedicated to incorporating double defect modes of a phononic crystal (PnC) into piezoelectric energy harvesting (PEH) systems to broaden the bandwidth. However, these prior studies are limited to examining an identical configuration of the double defects. Therefore, this paper aims to propose a new design concept for PnCs that examines differently configured double defects for broadband elastic wave energy localization and harvesting. For example, a square-pillar-type unit cell is considered and a defect is considered to be a structure where one piezoelectric patch is bonded to a host square lattice in the absence of a pillar. When the double defects introduced in a PnC are sufficiently distant from each other to implement decoupling behaviors, each defect oscillates like a single independent defect. Here, by differentiating the geometric dimensions of two piezoelectric patches, the defects’ dissimilar equivalent inertia and stiffness contribute to individually manipulating defect bands that correspond to each defect. Hence, with adequately designed piezoelectric patches that consider both the piezoelectric effects on shift patterns of defect bands and the characteristics for the output electric power obtained from a single-defect case, we can successfully localize and harvest the elastic wave energy transferred in broadband frequencies. Full article
(This article belongs to the Special Issue Applications of Phononic Crystals & Acoustic Metamaterials)
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10 pages, 4449 KiB  
Article
Research on High-Efficiency Transmission Characteristics of Multi-Channel Breast Ultrasound Signals Based on Graphene Structure
by Xinsa Zhao, Jianning Han, Peng Yang and Rongrong Zhao
Crystals 2021, 11(5), 507; https://doi.org/10.3390/cryst11050507 - 04 May 2021
Cited by 7 | Viewed by 1701
Abstract
In breast ultrasound CT imaging, the ultrasound signals received by high-density CMUT cylindrical array have problems of low transmission efficiency, susceptibility to interference from other signals, and an inability to achieve efficient acquisition. Therefore, to overcome these problems, based on acoustic metamaterials and [...] Read more.
In breast ultrasound CT imaging, the ultrasound signals received by high-density CMUT cylindrical array have problems of low transmission efficiency, susceptibility to interference from other signals, and an inability to achieve efficient acquisition. Therefore, to overcome these problems, based on acoustic metamaterials and graphene structure, an efficient transmission model of the multi-channel breast ultrasonic signals was designed, and a finite element simulation experiment was conducted. Research showed that the separation of ultrasonic signals could be achieved by the model designed in this article. The anti-interference ability in the ultrasonic signal acquisition process was effectively improved by the good multi-channel directional transmission and the sound wave local enhancement effect, which improved the sound wave transmission efficiency. In addition, the acoustic signals could be effectively transmitted from 80 kHz to 4000 kHz, realizing broadband transmission. Based on the flexibility of the design of the phononic crystal structure, phase adjustment could be achieved in a wide frequency range by changing the parameters of the primary cell structure. This enabled the CMUT cylindrical array to obtain better directivity characteristics, laying the foundation for high-quality breast ultrasound imaging. Full article
(This article belongs to the Special Issue Applications of Phononic Crystals & Acoustic Metamaterials)
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