Proposing a Novel Unit Cell for the Design of Tunable Nonlinear Metamaterials

https://pubs.aip.org/asa/jasa/article/153/3_supplement/A166/2885960/Unit-cell-of-three-nonlinear-layers-for-the-design

Unit Cell of Three Nonlinear Layers for the Design of Tunable Nonlinear Metamaterials
(184th ASA Meeting Pre-Recorded Research Talk) – Pravinkumar Ghodake

This academic research portfolio entry features a technical conference presentation delivered by an indepdnent research scholar Pravinkumar Ghodake, Research Scholar in the Department of Mechanical Engineering at IIT Bombay, accepted and presented within the Acoustic Metamaterials Section of the 184th Meeting of the Acoustical Society of America (ASA). Bridging advanced solid mechanics, nonlinear ultrasonics, and wave propagation, the talk presents a novel unit cell configuration utilizing three nonlinear layers of equal widths to act as a tunable nonlinear metamaterial. By varying the central layer intensity and total unit cell width, the study demonstrates precise control over the amplitudes of harmonically back-scattered and forward-scattered waves (2f), drawing direct parallels between acoustic harmonic scattering and Raman scattering in nonlinear optics. Viewers can jump directly to the one-slide conclusion at or explore the structured breakdown covering nonlinear ultrasonics, harmonic scattering motivations, problem formulation, systematic parametric results across widths from 300 to 2100 microns, and final conclusions. This media asset documents peer-reviewed academic dissemination and core theoretical and computational contributions in structural metamaterial design. 

Source:
https://www.youtube.com/watch?v=_BKjFGHdBps
https://doi.org/10.6084/m9.figshare.34004184

Nonlinear Waves in Hysteretic Material

Inverse Design of Nonlinear Metamaterials

Inverse Design to Stop Unwanted Second Harmonics in Nonlinear Ultrasonics
(NCMDAO 2021 Research Presentation) – Pravinkumar Ghodake

This academic research portfolio entry features a technical conference presentation delivered by Pravinkumar Ghodake, Research Scholar in the Department of Mechanical Engineering at IIT Bombay, presented at NCMDAO 2021 (@NCMDAO2021). Bridging advanced solid mechanics, computational inverse design, and nonlinear wave propagation, the talk addresses the limitations of traditional trial-and-error methods in mitigating harmonic distortion. It details an advanced optimization-driven inverse design framework utilizing Finite Element Analysis (FEA) in COMSOL to systematically tune input parameters and suppress unwanted second-order harmonic waves in nonlinear ultrasonic media. Viewers can explore the structured breakdown covering nonlinear ultrasonics and harmonic distortion, limitations of trial-and-error approaches, COMSOL finite element formulation, inverse design problem setup, numerical solution frameworks, input-output mapping, and harmonic suppression performance evaluations. This media asset documents core theoretical contributions and computational methodologies in advanced structural metamaterial and wave-control design. 

Source:
https://www.youtube.com/watch?v=uuK8Dcauc60
https://doi.org/10.6084/m9.figshare.34007676