32 citations · 80 across the 11 of their papers we have counts for
10 papers · 1 filter
In-Plane Linear Stress Waves in Layered Media: I. Non-Hermitian Degeneracies and Modal Chirality
Vahidreza Alizadeh, Alireza V. Amirkhizi
We study the band structure and scattering of in-plane coupled longitudinal and shear stress waves in linear layered media and observe that exceptional points (EP) appear for elast…
Optimization of Graded Metamaterials for Control of Energy Transmission Using a Genetic Algorithm
Joshua Morris, Weidi Wang, Thomas Plaisted +2
Optimization of functionally graded metamaterial arrays with a high dimensional and continuous geometric design space is cumbersome and could be accelerated via machine learning to…
Reduced Order Modeling of Dynamic Mechanical Metamaterials for Analysis of Infinite and Finite Systems
Weidi Wang, Alireza Amirkhizi
Dynamic mechanical metamaterials (MMs) are artificial media composed of periodic micro-structures, designed to manipulate wave propagation. Modeling and designing these materials c…
Multi-point Scattering Measurements for Effective Property Extraction from Metamaterials with Skin Effects
Joshua Morris, Alireza V. Amirkhizi
Scattering experiments can be leveraged to extract the effective properties of a heterogeneous metamaterial slab based on multi-point measurements in surrounding media. In this tec…
Angle-dependent Phononic Dynamics for Deep Learning and Source Localization
Weidi Wang, Amir Ashkan Mokhtari, Ankit Srivastava +1
In this work, a parameterized eigenvalue problem is analyzed for a phononic array in a 2D stress wave scattering setup, and a corresponding sensing application of this system is pr…
Overall dynamic properties of locally resonant viscoelastic layered media based on consistent field integration for oblique anti-plane shear waves
Vahidreza Alizadeh, Alireza V. Amirkhizi
In this work, the analysis of oblique anti-plane shear waves propagation and scattering in low frequency resonant micro-structured layered media with viscoelastic constituent layer…
Exceptional points and scattering of discrete mechanical metamaterials
Weidi Wang, Alireza V. Amirkhizi
Exceptional points (EPs) are complex singularities of parametric linear operators where two or more eigenvalues and eigenvectors coalesce. EPs are attracting increasing interest in…
Scattering under Linear Non Self-Adjoint Operators: Case of in-Plane Elastic Waves
Amir Ashkan Mokhtari, Yan Lu, Qiyuan Zhou +2
In this paper, we consider the problem of the scattering of in-plane waves at an interface between a homogeneous medium and a metamaterial. The relevant eigenmodes in the two regio…
Overall constitutive description of symmetric layered media based on scattering of oblique SH waves
Alireza V. Amirkhizi, Vahidreza Alizadeh
This papers investigates the scattering of oblique shear horizontal (SH) waves off finite periodic media made of elastic and viscoelastic layers. It further considers whether a Wil…
Reduced order derivation of the two-dimensional band structure of a mixed-mode resonator array
Alireza V. Amirkhizi, Weidi Wang
In this paper, the 2D band structure of a mixed-mode metamaterial resonator array for in-plane waves is investigated. The band structure in the interior and on the boundary of the…