Recently, non-Hermitian systems have attracted great attention on wave manipulations due
to the extraordinary wave control abilities by introducing lossy or active elements. One of the …

Advancements in additive manufacturing (AM) technology are promising for the creation of
acoustic materials. Acoustic metamaterials and metasurfaces are of particular interest for the …

Nonlinear oscillators can be used as a scattering mechanism to passively manipulate
propagating elastic waves in an energy-dependent manner. However, the interaction of …

Multiple scattering from a cluster of nonlinear point attachments on a beam is formulated and
analyzed. The nonlinear equation of motion is solved using a perturbation strategy. The …

Elastic wave absorption at subwavelength scale is of significance in many engineering
applications. Non-Hermitian metamaterials show the ability in high-efficiency wave …

In this paper, we develop two wave-based approaches for predicting the nonlinear periodic
response of jointed elastic bars. First, we present a nonlinear wave-based vibration …

This paper proposes a method to amplify the performance of a flexural-wave-generation
system by utilizing the energy-localization characteristics of a phononic crystal (PnC) with a …

While Willis coupling has been originally proposed as the analog bianisotropy for elastic
waves in a bulk solid, its realizations are currently limited to airborne sound and flexural …

It is demonstrated that acoustic transmission through a phononic crystal with anisotropic
solid scatterers becomes non-reciprocal if the background fluid is viscous. In an ideal …

Metamaterials and metasurfaces have been widely developed recently for extraordinary
acoustic and elastic wave control at a deep subwavelength scale. Perfect wave absorption …