Molding the Acoustic Attenuation in Quasi-Ordered Structures: Experimental Realization

Abstract

Inverse-designed scattering acoustical elements, called quasi-ordered structures (QOSs), are theoretically and experimentally reported in this work, showing their possibilities as attenuation devices. Multiobjective evolutionary algorithms together with multiple scattering theory have been used to design a distribution of vacancies in a phononic crystal in order to create a QOS with predetermined properties. This work shows the experimental realization of QOSs with both high and stable values of acoustic attenuation in a given range of frequencies, proving the performance of the optimization procedure. Molding the acoustic attenuation is one of the most important properties for the design of effective filters.