Evolution of Phononic Band Gaps in One-Dimensional Phononic Crystals that Incorporate High-T c Superconductor and Magnetostrictive Materials

2017 ◽  
Vol 30 (10) ◽  
pp. 2711-2716 ◽  
Author(s):  
Arafa H. Aly ◽  
Ahmed Mehaney ◽  
Sahar A. El-Naggar
Keyword(s):  
Phononic Crystals ◽  
Band Gaps ◽  
One Dimensional ◽  
Magnetostrictive Materials ◽  
Phononic Band Gaps

Acoustic wave frequency filtering in constant total length phononic crystals of Al/Pb multilayer

2021 ◽  
Author(s):  
Chittaranjan Nayak ◽  
Mehdi Solaimani ◽  
Alireza Aghajamali ◽  
Arafa H. Aly
Keyword(s):  
Acoustic Wave ◽  
Phononic Crystal ◽  
Phononic Crystals ◽  
Geometrical Parameters ◽  
One Dimensional ◽  
Internal Geometry ◽  
Total Length ◽  
Acoustic Filters ◽  
System Length ◽  
Phononic Band Gaps

In this study, we have scrutinized the frequency gap generation by changing the geometrical parameters of a one-dimensional phononic crystal. For this purpose, we have calculated the transmission coefficient of an incident acoustic wave by using the transfer matrix method. We have retained and fixed the total length of the system and changed the system internal geometry not to increase the system length too much. Another reason was to adjust the phononic band gaps and get the desired transmission properties by finding the optimum internal geometry without increasing or decreasing the total length of phononic crystals. In addition, we also propose few structures with the opportunity of applications in acoustical devices such as sonic reflectors. Our results can also be of high interest to design acoustic filters in the case that transmission of certain frequencies is necessary.

scholarly journals Phononic Band Gaps of Elastic Periodic Structures: A Homogenization Theory Study

2007 ◽  
Author(s):  
Ying-Hong Liu ◽  
Chien C. Chang ◽  
Ruey-Lin Chern ◽  
C. Chung Chang
Keyword(s):  
Elastic Constants ◽  
Periodic Structures ◽  
Mass Density ◽  
Density Ratio ◽  
Low Frequency ◽  
Phononic Crystals ◽  
Band Gaps ◽  
Homogenization Theory ◽  
Dominant Factor ◽  
Phononic Band Gaps

In this study, we investigate band structures of phononic crystals with particular emphasis on the effects of the mass density ratio and of the contrast of elastic constants. The phononic crystals consist of arrays of different media embedded in a rubber or epoxy. It is shown that the density ratio rather than the contrast of elastic constants is the dominant factor that opens up phononic band gaps. The physical background of this observation is explained by applying the theory of homogenization to investigate the group velocities of the low-frequency bands at the center of symmetry Γ.

Large one-dimensional band gaps in three-component phononic crystals plates

2007 ◽  
Vol 366 (4-5) ◽  
pp. 493-496 ◽  
Author(s):  
Jiu-Jiu Chen ◽  
H.L.W. Chan ◽  
Jian-Chun Cheng
Keyword(s):  
Phononic Crystals ◽  
Band Gaps ◽  
One Dimensional

The Study of Characteristics of Sphere-Radial Phononic Crystals

2011 ◽  
Vol 211-212 ◽  
pp. 609-614 ◽  
Author(s):  
Qi Hua Wen
Keyword(s):  
Phononic Crystal ◽  
Phononic Crystals ◽  
Band Gaps ◽  
Practical Application ◽  
Elastic Wave Equation ◽  
Application Performance ◽  
One Dimensional ◽  
Simulation Results ◽  
The One ◽  
Attenuation Characteristics

By deducing the spherical elastic wave equation in theory, the concept of sphere-radial phononic crystal is proposed, and then the equations to determine the acoustic band structures is deduced. A numerical example is given for steel/nitrile rubber phononic crystal. The numerical simulation results suggest that the band gaps of sphere-radial phononic crystals do exist, which have better attenuation characteristics and practical application performance than the one-dimensional phononic crystals.

scholarly journals Hyperelastic Tuning of One-Dimensional Phononic Band Gaps Using Directional Stress

2018 ◽  
Vol 65 (6) ◽  
pp. 1056-1061 ◽  
Author(s):  
Andriejus Demcenko ◽  
Michael Mazilu ◽  
Rab Wilson ◽  
Arno W. F. Volker ◽  
Jonathan M. Cooper
Keyword(s):  
Band Gaps ◽  
One Dimensional ◽  
Phononic Band Gaps
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