WAVE PROPAGATION IN CELLULAR LOCALLY RESONANT METAMATERIALS

Authors

  • CLAUDIA COMI DIPARTIMENTO DI INGEGNERIA CIVILE E AMBIENTALE, POLITECNICO DI MILANO, PIAZZA LEONARDO DA VINCI 32, 20133 MILAN, ITALY
  • LARISSA DRIEMEIER DEPARTAMENTO DE ENGENHARIA MECATRÔNICA E DE SISTEMAS MECÂNICOS, UNIVERSIDADE DE SÃO PAULO, SÃO PAULO, SP, BRASIL

Abstract

LOCALLY RESONANT ACOUSTIC METAMATERIALS HAVE RECENTLY ATTRACTED A GREAT INTEREST DUE TO THEIR DYNAMIC BEHAVIOUR, CHARACTERIZED BY A BAND GAP AT RELATIVELY LOW FREQUENCIES. THIS PAPER PROVIDES A NUMERICAL STUDY, BY MEANS OF FINITE ELEMENT MODAL ANALYSES, OF THE DYNAMIC PROPERTIES OF 1D MASS-IN-MASS AND 2D CELLULAR LOCALLY RESONANT METAMATERIALS. THE 2D METAMATERIAL IS CONSTITUTED BY A CELLULAR METALLIC LATTICE, FILLED BY A SOFT LIGHT MATERIAL WITH HEAVY INCLUSIONS OR RESONATORS. THE INFLUENCE OF MATERIAL PARAMETERS AND CELL GEOMETRY ON THE BAND GAP WIDTH AND FREQUENCY LEVEL ARE EXPLORED. IN ADDITION TO THE USUAL SQUARE LATTICE WE ALSO CONSIDER AN HEXAGONAL ONE, WHICH PROVES TO BE MORE EFFICIENT FOR WAVE FILTERING.

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Published

2018-03-26

Issue

Vol. 15 No. 4 (2018)

Section

Articles

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