Analysis and Experimental Validation of an Optimized Gradient-Index Phononic-Crystal Lens

2018 ◽  
Vol 10 (2) ◽  
Author(s):  
Amir Darabi ◽  
Michael J. Leamy
Keyword(s):  
Experimental Validation ◽  
Phononic Crystal ◽  
Gradient Index

scholarly journals Design and experimental validation of a temperature-driven adaptive phononic crystal slab

2019 ◽  
Vol 28 (3) ◽  
pp. 035007 ◽  
Author(s):  
K Billon ◽  
M Ouisse ◽  
E Sadoulet-Reboul ◽  
M Collet ◽  
P Butaud ◽  
...  
Keyword(s):  
Experimental Validation ◽  
Phononic Crystal

Achromatic acoustic gradient-index phononic crystal lens for broadband focusing

2020 ◽  
Vol 116 (23) ◽  
pp. 234102
Author(s):  
Jaeyub Hyun ◽  
Wan-Ho Cho ◽  
Choon-Su Park ◽  
Jiho Chang ◽  
Miso Kim
Keyword(s):  
Phononic Crystal ◽  
Gradient Index

scholarly journals Highly Localized and Efficient Energy Harvesting in a Phononic Crystal Beam: Defect Placement and Experimental Validation

Crystals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 391 ◽  
Author(s):  
Xu-Feng Lv ◽  
Xiang Fang ◽  
Zhi-Qiang Zhang ◽  
Zhi-Long Huang ◽  
Kuo-Chih Chuang
Keyword(s):  
Energy Harvesting ◽  
Point Defect ◽  
Polyvinylidene Fluoride ◽  
Experimental Validation ◽  
Flexural Rigidity ◽  
Phononic Crystal ◽  
Defect Mode ◽  
Unit Cell ◽  
Pvdf Film ◽  
Efficient Energy

We study energy harvesting in a binary phononic crystal (PC) beam at the defect mode. Specifically, we consider the placement of a mismatched unit cell related to the excitation point. The mismatched unit cell contains a perfect segment and a geometrically mismatched one with a lower flexural rigidity which serves as a point defect. We show that the strain in the defect PC beam is much larger than those in homogeneous beams with a defect segment. We suggest that the defect segment should be arranged in the first unit cell, but not directly connected to the excitation source, to achieve efficient less-attenuated localized energy harvesting. To harvest the energy, a polyvinylidene fluoride (PVDF) film is attached on top of the mismatched segment. Our numerical and experimental results indicate that the placement of the mismatched segment, which has not been addressed for PC beams under mechanical excitation, plays an important role in efficient energy harvesting based on the defect mode.

Efficient focalization of antisymmetric Lamb waves in gradient-index phononic crystal plates

2012 ◽  
Vol 101 (26) ◽  
pp. 261905 ◽  
Author(s):  
Jinfeng Zhao ◽  
Rémi Marchal ◽  
Bernard Bonello ◽  
Olga Boyko
Keyword(s):  
Lamb Waves ◽  
Phononic Crystal ◽  
Gradient Index

Multi-branch subwavelength focusing of the lowest-order antisymmetric Lamb mode in a gradient-index phononic crystal

2019 ◽  
Vol 157-158 ◽  
pp. 677-683 ◽  
Author(s):  
Xiaodong Cui ◽  
Jinfeng Zhao ◽  
Olga Boyko ◽  
Bernard Bonello ◽  
Zheng Zhong
Keyword(s):  
Phononic Crystal ◽  
Gradient Index ◽  
Lamb Mode

Focusing of the lowest antisymmetric Lamb wave in a gradient-index phononic crystal plate

2011 ◽  
Vol 98 (17) ◽  
pp. 171911 ◽  
Author(s):  
Tsung-Tsong Wu ◽  
Yan-Ting Chen ◽  
Jia-Hong Sun ◽  
Sz-Chin Steven Lin ◽  
Tony Jun Huang
Keyword(s):  
Lamb Wave ◽  
Phononic Crystal ◽  
Crystal Plate ◽  
Gradient Index

scholarly journals Linking Time-Domain Vibration Behaviors to Spatial-Domain Propagating Waves in a Leaf-like Gradient-Index Phononic Crystal Lens

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1490
Author(s):  
Kuo-Chih Chuang ◽  
Dan-Feng Wang ◽  
Jun-Jie Liu ◽  
Chan-Yi Liao
Keyword(s):  
Time Domain ◽  
Periodic Structures ◽  
Phononic Crystal ◽  
Plane Waves ◽  
Spatial Domain ◽  
Gradient Index ◽  
Transient Wave ◽  
Element Analysis ◽  
Propagating Waves ◽  
Unit Cells

It is known that a propagating wave at a certain spatial point can be decomposed into plane waves propagating at different angles. In this work, by designing a gradient index phononic crystal lens (GRIN PCL) with transverse-continuous leaf-like unit cells, we theoretically and experimentally show that the spatial-domain propagating waves in finite periodic structures can be linked to their time-domain vibration behaviors. The full-field instantaneous focusing behaviors of Lamb waves in the proposed leaf-like GRIN PCL give an example of the wave-vibration linkage in finite periodic structures while allowing a certain complexity. The conclusion in this paper can help one skip iterative time-consuming finite element analysis (e.g., time-stepping solutions) to avoid possible numerical instabilities occurred in calculating transient wave field on practical finite metamaterials or phononic crystals having unit cells with complicated configurations.

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