An integrated framework for the design of aeroacoustic metamaterials

This paper deals with the development of an integrated framework for the development of acoustic metamaterials tailored to aeroacoustic applications. Indeed, the contributions available in the literature targeted are still limited (although constantly increasing) with respect to the gigantic amount of works on standard acoustic metamaterials. The research is driven by the urgent need to substantially reduce the noise produced by the civil aviation to guarantee the sustainable evolution of the system in a constantly growing market. The target reductions required to mitigate the impact on population will be achieved only through the introduction of breakthrough technologies. The present research aims at the complete disclosure of the acoustic metamaterials potential to contribute to this target. The approach starts from the formulation of the fundamental equations governing the propagation of an acoustic disturbance within a generic metacontinuum operating in the presence of a background flow. The model is coupled with an original homogenization scheme, to identify, through numerical optimization, the basic properties of a periodic structure matching the target metacontinuum response. Preliminary numerical results are obtained using dedicated finite and boundary element methods.This paper deals with the development of an integrated framework for the development of acoustic metamaterials tailored to aeroacoustic applications. Indeed, the contributions available in the literature targeted are still limited (although constantly increasing) with respect to the gigantic amount of works on standard acoustic metamaterials. The research is driven by the urgent need to substantially reduce the noise produced by the civil aviation to guarantee the sustainable evolution of the system in a constantly growing market. The target reductions required to mitigate the impact on population will be achieved only through the introduction of breakthrough technologies. The present research aims at the complete disclosure of the acoustic metamaterials potential to contribute to this target. The approach starts from the formulation of the fundamental equations governing the propagation of an acoustic disturbance within a generic metacontinuum operating in the presence of a background flow. The model is ...