Shape Optimization of Two-Dimensional Acoustic Metamaterials and Phononic Crystals with a Time-Dependent Adjoint Formulation

2016 ◽  
Author(s):  
Weiyang Lin ◽  
William K. Anderson ◽  
James Newman ◽  
Xueying Zhang
Keyword(s):  
Shape Optimization ◽  
Phononic Crystals ◽  
Time Dependent ◽  
Two Dimensional ◽  
Acoustic Metamaterials ◽  
Adjoint Formulation

Negative and density-near-zero acoustic metamaterials based on quasi-two-dimensional phononic crystals

2013 ◽  
Vol 133 (5) ◽  
pp. 3373-3373
Author(s):  
Victor Manuel Garcia-Chocano ◽  
Rogelio Graciá-Salgado ◽  
Daniel Torrent ◽  
José Sánchez-Dehesa
Keyword(s):  
Phononic Crystals ◽  
Two Dimensional ◽  
Acoustic Metamaterials

scholarly journals Plane and Surface Acoustic Waves Manipulation by Three-Dimensional Composite Phononic Pillars with 3D Bandgap and Defect Analysis

Acoustics ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 25-41
Author(s):  
Muhammad ◽  
C.W. Lim ◽  
Andrew Y. T. Leung
Keyword(s):  
Acoustic Waves ◽  
Wave Attenuation ◽  
Numerical Technique ◽  
Surface Acoustic Waves ◽  
Three Dimensional ◽  
Phononic Crystals ◽  
Defect State ◽  
Two Dimensional ◽  
Defect Analysis ◽  
Acoustic Metamaterials

The current century witnessed an overwhelming research interest in phononic crystals (PnCs) and acoustic metamaterials (AMs) research owing to their fantastic properties in manipulating acoustic and elastic waves that are inconceivable from naturally occurring materials. Extensive research literature about the dynamical and mechanical properties of acoustic metamaterials currently exists, and this maturing research field is now finding possible industrial and infrastructural applications. The present study proposes a novel 3D composite multilayered phononic pillars capable of inducing two-dimensional and three-dimensional complete bandgaps (BGs). A phononic structure that consisted of silicon and tungsten layers was subjected to both plane and surface acoustic waves in three-dimensional and two-dimensional periodic systems, respectively. By frequency response study, the wave attenuation, trapping/localization, transmission, and defect analysis was carried out for both plane and surface acoustic waves. In the bandgap, the localized defect state was studied for both plane and surface acoustic waves separately. At the defect state, the localization of both plane and surface acoustic waves was observed. By varying the defect size, the localized frequency can be made tailorable. The study is based on a numerical technique, and it is validated by comparison with a reported theoretical work. The findings may provide a new perspective and insight for the designs and applications of three-dimensional phononic crystals for surface acoustic wave and plane wave manipulation, particularly for energy harvesting, sensing, focusing and waves isolation/attenuation purposes.

Negative and density-near-zero acoustic metamaterials based on quasi-two-dimensional phononic crystals.

2013 ◽  
Author(s):  
Victor M. Garcia-Chocano ◽  
Rogelio Graciá-Salgado ◽  
Francisco Cervera ◽  
Daniel Torrent ◽  
Jose Sanchez-Dehesa
Keyword(s):  
Phononic Crystals ◽  
Two Dimensional ◽  
Acoustic Metamaterials

scholarly journals Topology and shape optimization of broadband acoustic metamaterials and phononic crystals

2017 ◽  
Vol 38 (5) ◽  
pp. 254-260 ◽  
Author(s):  
Weiyang Lin ◽  
James C. Newman ◽  
W. Kyle Anderson ◽  
Xueying Zhang
Keyword(s):  
Shape Optimization ◽  
Phononic Crystals ◽  
Acoustic Metamaterials ◽  
Topology And Shape Optimization

Multiband acoustic waveguides constructed by two-dimensional phononic crystals

2020 ◽  
Vol 13 (9) ◽  
pp. 094001
Author(s):  
Wei Zhao ◽  
Yunfei Xu ◽  
Yuting Yang ◽  
Zhi Tao ◽  
Zhi Hong Hang
Keyword(s):  
Phononic Crystals ◽  
Two Dimensional ◽  
Acoustic Waveguides

scholarly journals Integrable unsteady motion with an application to ocean eddies

1998 ◽  
Vol 5 (3) ◽  
pp. 145-151
Author(s):  
A. D. Kirwan, Jr. ◽  
B. L. Lipphardt, Jr.
Keyword(s):  
Potential Vorticity ◽  
Particle Motion ◽  
Gulf Stream ◽  
Incompressible Flows ◽  
Unsteady Motion ◽  
Ring System ◽  
Time Dependent ◽  
Two Dimensional ◽  
Ocean Eddies ◽  
Multilayered Systems

Abstract. Application of the Brown-Samelson theorem, which shows that particle motion is integrable in a class of vorticity-conserving, two-dimensional incompressible flows, is extended here to a class of explicit time dependent dynamically balanced flows in multilayered systems. Particle motion for nonsteady two-dimensional flows with discontinuities in the vorticity or potential vorticity fields (modon solutions) is shown to be integrable. An example of a two-layer modon solution constrained by observations of a Gulf Stream ring system is discussed.

Sign in / Sign up

Export Citation Format

Share Document