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

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.

Conformal gradient-index phononic crystal lens for ultrasonic wave focusing in pipe-like structures

2020 ◽  
Vol 117 (2) ◽  
pp. 021906
Author(s):  
Hrishikesh Danawe ◽  
Gorkem Okudan ◽  
Didem Ozevin ◽  
Serife Tol
Keyword(s):  
Ultrasonic Wave ◽  
Phononic Crystal ◽  
Gradient Index ◽  
Wave Focusing

Dramatic Enhancement of Elastic Wave Energy Harvesting Using a Gradient-Index Phononic Crystal Lens

2016 ◽  
Author(s):  
Serife Tol ◽  
F. Levent Degertekin ◽  
Alper Erturk
Keyword(s):  
Energy Harvesting ◽  
Plane Wave ◽  
Elastic Wave ◽  
Wave Energy ◽  
Power Output ◽  
Phononic Crystal ◽  
Gradient Index ◽  
Wave Band ◽  
Wave Excitation ◽  
Elastic Wave Energy

In this paper, we explore structure-borne elastic wave energy harvesting, both numerically and experimentally, by exploiting a Gradient-Index Phononic Crystal Lens (GRIN-PCL) structure. The proposed GRIN-PCL is formed by an array of blind holes with different diameters on an aluminum plate where the orientation and size of the blind holes are tailored to obtain a hyperbolic secant gradient distribution of refractive index guided by finite-element simulations of the lowest asymmetric mode Lamb wave band diagrams. Under plane wave excitation from a line source, experimentally measured wave field successfully validates the numerical simulation of wave focusing within the GRIN-PCL domain. A piezoelectric energy harvester disk located at the first focus of the GRIN-PCL yields an order of magnitude larger power output as compared to the baseline case of energy harvesting without the GRIN-PCL on the uniform plate counterpart for the same incident plane wave excitation. The power output is further improved by a factor of five using complex electrical load impedance matching through resistive-inductive loading as compared to purely resistive loading case.

Torsional wave focusing in cylindrical structures with the conformal gradient-index phononic crystal lens

2021 ◽  
Vol 129 (17) ◽  
pp. 174902
Author(s):  
Gorkem Okudan ◽  
Hrishikesh Danawe ◽  
Didem Ozevin ◽  
Serife Tol
Keyword(s):  
Phononic Crystal ◽  
Torsional Wave ◽  
Gradient Index ◽  
Wave Focusing ◽  
Cylindrical Structures
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