We propose a new type of platonic crystal, which includes spiral resonators with low-
frequency resonant vibrations. The special dynamic effects of the resonators are highlighted …

Active noise cloaking of rigid and elastic 2D cylindrical shells in an infinite acoustic medium
is presented. The control approach utilises control sources or forces and discrete error …

Acoustic cloaking has mostly been considered within a stationary fluid. The authors herein
show that accounting for the effects of convection in the presence of fluid flow is critical for …

We present an active exterior cloak for flexural waves propagating in a Kirchhoff plate of
infinite extent. The evanescent multipole devices are characterized by Macdonald functions …

Acoustic cloaking has received significant interest due to the appealing ability to render an
object acoustically invisible. In a similar concept to acoustic cloaking, acoustic illusions …

The work is divided into two main topics. In the first part a formulation for Perfectly Matched
Layers is given. Surprisingly, such formulation was absent in the scientific literature. In the …