Improving the sound absorption behaviour of porous concrete using embedded resonant structures

Abstract A relatively new concept of sound absorption herein denominated as Metaporous concrete is presented, consisting a porous concrete-based absorber in which different acoustic resonators are embedded. Two finite element models were implemented, using the fluid-equivalent theory to describe solutions. Helmholtz resonator, samples, and prototype built tested through experimental techniques based on use an impedance tube. The complex properties validated with comparisons between analytical predictions data. proposed numerical tools presented efficient methodology predict behavior solutions, where excellent approach simulated results data shown. parametric study shows strategies increase feature two coefficient peaks provided by solutions (i. e. from resonator concrete, respectively). configuration MPCd was highlighted because great proximity these peaks. inclusion non-trivial resonant structures building can be solution adopted for noise control civil engineering exterior applications.