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SUMMARY:Simplified models of multiple-scattering effects in Acoustic Metam
 aterials with a soft matrix - Alex Skvortsov (University of New South Wale
 s)
DTSTART:20230525T132500Z
DTEND:20230525T141000Z
UID:TALK198922@talks.cam.ac.uk
DESCRIPTION:Acoustic Metamaterials comprising a soft medium embedded with 
 a lattice of small scatterers (cavities or hard inclusions) have tradition
 ally been used for exploration of new wave phenomena (wave trapping and lo
 calisation\, acoustic cloaking\, imaging\, focusing\, filtering). This is 
 due to the strong coupling between the sub-wavelength resonances of indivi
 dual scatterers (determined by low shear modulus) and the Bragg scattering
  caused by periodical arrangements of the scatterers.&nbsp\; Multiple scat
 tering of acoustic waves between scatterers in proximity can further stren
 gthen the resonance\, leading to enhanced wave manipulation that can block
  transmission or perfectly absorb sound waves. This becomes important for 
 practical solutions in many maritime applications to control water-born so
 und. We discuss a number of phenomenological methods that can be used to i
 ncorporate multiple-scattering effects in the analytical models of Acousti
 c Metamaterials with a soft (rubber-like) matrix. These methods heavily em
 ploy the well-known analogies and results from electrostatics and diffusio
 n. These analogies stem from the overarching analytical framework of the u
 nderlying Laplace equation that can be applied to describe Acoustic Metama
 terials at the low-frequency limit (but still above subwavelength resonanc
 e of individual scatterers). To validate the assumptions of the theory som
 e numerical results are also presented.&nbsp\;&nbsp\;&nbsp\;&nbsp\;&nbsp\;
 &nbsp\;&nbsp\;&nbsp\;
LOCATION:Seminar Room 1\, Newton Institute
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