Overlapping of acoustic bandgaps using fractal geometries

Abstract

Acoustic Band Gap materials are suitable materials to construct devices for controlling the propagation of sonic waves by means of the multiple scattering phenomenon. One of their applications is the control of outdoor noise, acting as acoustic filters. Thus, a great effort to increase the non-transmission properties has been done. To do that, a design of acoustic scatterers with added acoustic properties, as absorption or resonance behaviour, has been developed. But to obtain a high acoustical performance in the control of noise, it seems necessary to improve to the maximum level the different involved mechanisms. In this work we present a new arrangement of scatterers based on fractal geometries to increase the multiple scattering phenomenon.