5 papers
Nonreciprocity and mode conversion in a spatiotemporally modulated elastic wave circulator
Benjamin M. Goldsberry, Samuel P. Wallen, Michael R. Haberman
Acoustic and elastic metamaterials with time- and space-dependent material properties have received great attention recently as a means to break reciprocity for propagating mechani…
Optimal design of acoustic metamaterial cloaks under uncertainty
Peng Chen, Michael R. Haberman, Omar Ghattas
In this work, we consider the problem of optimal design of an acoustic cloak under uncertainty and develop scalable approximation and optimization methods to solve this problem. Th…
Acoustic scattering from a fluid cylinder with Willis constitutive properties
Michael B. Muhlestein, Benjamin M. Goldsberry, Andrew N. Norris +1
A material that exhibits Willis coupling has constitutive equations that couple the pressure-strain and momentum-velocity relationships. This coupling arises from subwavelength asy…
Non-reciprocal wave phenomena in spring-mass chains with effective stiffness modulation induced by geometric nonlinearity
Samuel P. Wallen, Michael R. Haberman
Acoustic non-reciprocity has been shown to enable a plethora of effects analogous to phenomena seen in quantum physics and electromagnetics, such as immunity from back-scattering a…
Broadband focusing of underwater sound using a transparent pentamode lens
Xiaoshi Su, Andrew N. Norris, Colby W. Cushing +2
We report an inhomogeneous acoustic metamaterial lens based on spatial variation of refractive index for broadband focusing of underwater sound. The index gradient follows a modifi…