One-way transmission and mode conversion of elastic waves by a hybrid phononic crystal structure

2019 ◽  
Vol 125 (21) ◽  
pp. 215101 ◽  
Author(s):  
Ji-En Wu ◽  
Ruixia Hu ◽  
Bing Tang ◽  
Xiaoyun Wang ◽  
Han Jia ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Elastic Waves ◽  
Mode Conversion ◽  
Phononic Crystal

scholarly journals An elastic fiber based on phononic crystals

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Farzaneh Motaei ◽  
Ali Bahrami
Keyword(s):  
Crystal Structure ◽  
Elastic Waves ◽  
Acoustic Waves ◽  
Elastic Fiber ◽  
Phononic Crystal ◽  
Phononic Crystals ◽  
Core Region ◽  
Crystal Fiber ◽  
The Core ◽  
First Time

AbstractIn this study, a novel elastic phononic crystal fiber has been presented for the first time. This proposed structure can expand the sonic communications field, significantly. In order to realize the elastic fiber performance, solid–solid phononic crystal has been utilized. The phononic crystal structure operates as cladding in surroundings and central region acts as core of fiber by elimination of rods. Incident acoustic waves with transverse polarization have confined and propagated in the core region of the phononic crystal fiber. Two types of phononic crystal fiber with different core radii have been investigated. Incident elastic waves can confine in the core region with confinement factor higher than 500. Also, longitudinal losses have been achieved low and equal to 0.35 dB/km.

Designing a phononic crystal with large-size defect to enhance elastic wave energy localization and harvesting

2021 ◽  
Author(s):  
Xian’e Yang ◽  
Jiahui Zhong ◽  
Jiawei Xiang
Keyword(s):  
Energy Harvesting ◽  
Elastic Waves ◽  
Phononic Crystal ◽  
Defect Mode ◽  
Energy Localization ◽  
Remarkable Effect ◽  
Large Size ◽  
Piezoelectric Energy ◽  
Elastic Wave Energy ◽  
Multiple Cells

Abstract Phononic crystal (PnC) has been proved for its manipulation and amplification of elastic waves. Using this characteristic of PnC to assist energy harvesting has remarkable effect. Generally, defect occurs when unit cell in PnC is replaced by another cell with different geometric or material properties, the output electric power of piezoelectric energy harvesting (PEH) devices will be significantly enhanced. In this study, a cross hole-type PnC-assisted PEH device with a large-size defect is presented by replacing several adjacent multiple cells with other cells. It is found that multiple peak voltages can be created within BG and multimodal energy harvesting can be performed. Compared with the defect mode composed of a small-size defect, energy localization and amplification of the proposed PnC leads to substantially enhancement of harvesting power after tailoring geometric parameters of a PEH device. This work will be expected to design PnC-assisted PEH devices in a reasonable way.

Phononic Band Gaps in Al2O3/Epoxy Composite

2018 ◽  
Vol 912 ◽  
pp. 112-117 ◽  
Author(s):  
Edson Jansen Pedrosa Miranda Jr. ◽  
J.M.C. dos Santos
Keyword(s):  
Cross Section ◽  
Transverse Vibration ◽  
Elastic Waves ◽  
Epoxy Composite ◽  
Phononic Crystal ◽  
Band Gaps ◽  
Square Lattice ◽  
Plane Wave Expansion ◽  
Phononic Band Gaps ◽  
Angle Of Rotation

In this study, we have investigated the band structure of elastic waves propagating in a phononic crystal, consisting of an epoxy matrix reinforced by Al2O3 inclusions in a square and hexagonal lattices. We also studied the influence of the inclusion geometry cross section – circular, hollow circular, square and rotated square with a 45° angle of rotation with respect to the x, y axes. The plane wave expansion (PWE) method is used to solve the wave equation considering the wave propagation in the xy plane (longitudinal-transverse vibration, XY mode, and transverse vibration, Z mode). The complete band gaps between the XY and Z modes are observed to circular, square and rotated square cross section inclusion and the best performance is for rotated square cross section inclusion in a square lattice. We suggest that the Al2O3/epoxy composite is feasible for vibrations management.

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