Experimental demonstrations in audible frequency range of band gap tunability and negative refraction in two-dimensional sonic crystal

2012 ◽  
Vol 132 (4) ◽  
pp. 2816-2822 ◽  
Author(s):  
Hélène Pichard ◽  
Olivier Richoux ◽  
Jean-Philippe Groby
Keyword(s):  
Band Gap ◽  
Negative Refraction ◽  
Two Dimensional ◽  
Frequency Range ◽  
Audible Frequency ◽  
Sonic Crystal

Mathematical Techniques for the Design of Band Gap Materials

2007 ◽  
Author(s):  
E. Fuster-Garcia ◽  
V. Romero-Garcia ◽  
L. M. Garci´a-Raffi ◽  
J. V. Sa´nchez-Pe´rez
Keyword(s):  
Experimental Data ◽  
Band Gap ◽  
Frequency Range ◽  
Audible Frequency ◽  
Mathematical Techniques ◽  
Sonic Crystals ◽  
Tools And Methods

The rigourous study of band gap materials in the last years has given as a result that these systems have interesting properties for technological purposes. However, the use of this materials for specific applications requires new tools and methods that help us to obtain optimized materials and realistic simulations. In this work we present two tools that let us obtain these realistic simulations based on experimental data and to optimize the band gap materials for specific uses. Also we present results for the specific case of Sonic Crystals in the audible frequency range.

scholarly journals Research on the Band Gap Characteristics of Two-Dimensional Phononic Crystals Microcavity with Local Resonant Structure

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Mao Liu ◽  
Pei Li ◽  
Yongteng Zhong ◽  
Jiawei Xiang
Keyword(s):  
Band Gap ◽  
Phononic Crystal ◽  
Engineering Application ◽  
Low Frequency ◽  
Phononic Crystals ◽  
Band Gaps ◽  
Wave Band ◽  
Two Dimensional ◽  
Frequency Range ◽  
Gap Characteristics

A new two-dimensional locally resonant phononic crystal with microcavity structure is proposed. The acoustic wave band gap characteristics of this new structure are studied using finite element method. At the same time, the corresponding displacement eigenmodes of the band edges of the lowest band gap and the transmission spectrum are calculated. The results proved that phononic crystals with microcavity structure exhibited complete band gaps in low-frequency range. The eigenfrequency of the lower edge of the first gap is lower than no microcavity structure. However, for no microcavity structure type of quadrilateral phononic crystal plate, the second band gap disappeared and the frequency range of the first band gap is relatively narrow. The main reason for appearing low-frequency band gaps is that the proposed phononic crystal introduced the local resonant microcavity structure. This study provides a good support for engineering application such as low-frequency vibration attenuation and noise control.

scholarly journals Band Gap and Vibration Reduction Properties of Damped Rail with Two-Dimensional Honeycomb Phononic Crystals

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Rixin Cui ◽  
Jinsong Zhou ◽  
Dao Gong
Keyword(s):  
Elastic Modulus ◽  
Band Gap ◽  
Vibration Reduction ◽  
Phononic Crystals ◽  
Design Parameters ◽  
Rail Transit ◽  
Two Dimensional ◽  
Frequency Range ◽  
Filling Fraction ◽  
The Matrix

The prevention of environmental vibration pollution induced by train operation is one of the inevitable problems in the construction of urban rail transit. With the advantage of flexible adjustment, phononic crystals (PCs) have a broad application prospect in suppressing elastic wave propagation of rail transit. In this paper, a damped rail with two-dimensional honeycomb PCs was proposed, and its band structure was analysed with FEM. Then, a parametric study was used to investigate the influences of design parameters of the honeycomb PCs on its band gap property. Furthermore, with a 3D half-track model, the vibration reduction property of the damped rail with honeycomb PCs was discussed. The results show that the damped rail with honeycomb PCs has an absolute band gap in the frequency range of 877.3–1501.7 Hz, which includes the pinned-pinned resonance frequency of the rail internally. Reducing the filling fraction and elastic modulus of the matrix can obtain an absolute band gap in a lower frequency range but also bring a narrower bandwidth. The decrease of scatterer density leads to higher boundary frequencies of the absolute band gap and descends the bandwidth. In order to obtain an absolute band gap which can suppress the pinned-pinned resonance of the rail and keep a wider bandwidth, the filling fraction is suitable to be about 0.5, and the elastic modulus of the matrix is proposed to be not more than 0.6 MPa. Metals with heavy density can be used as the scatterer to obtain a better vibration reduction effect. It is hoped that the research results can provide a reference for the application of PCs in track vibration reduction.

A Natural Humidity Sensitive Two-dimensional Tunable Photonic Band Gap Material and its Optic Properties

2009 ◽  
Vol 24 (1) ◽  
pp. 57-60 ◽  
Author(s):  
Wei-Gang ZHANG ◽  
Jun YAN ◽  
Gang WANG ◽  
Hao-Xuan LI ◽  
Gang-Sheng ZHANG
Keyword(s):  
Band Gap ◽  
Photonic Band Gap ◽  
Two Dimensional ◽  
Photonic Band Gap Material ◽  
Photonic Band

scholarly journals Evidence of direct electronic band gap in two-dimensional van der Waals indium selenide crystals

2019 ◽  
Vol 3 (3) ◽  
Author(s):  
Hugo Henck ◽  
Debora Pierucci ◽  
Jihene Zribi ◽  
Federico Bisti ◽  
Evangelos Papalazarou ◽  
...  
Keyword(s):  
Band Gap ◽  
Van Der Waals ◽  
Indium Selenide ◽  
Two Dimensional ◽  
Electronic Band ◽  
Electronic Band Gap
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