Numerical optimization of liner impedance in acoustic duct

The SALUTE project aims at evaluating performance of metacomposites for acoustic smart lining in grazing turbulent fow. Theoretical and numerical investigations are carried out for designing innovative specimen. A special focus is placed in the realization of prototypes for evaluating the metacomposite liner performances in 2D and 3D liners, its process complexity and robustness. The insight gain in this project is new tools for obtaining innovative samples; the acoustical experimental tests demonstrate eciency and robustness of such technology for controlling UHBR noise emission. This paper is focused on parametric study based on the maximization of the absorption coefficient in a duct by optimizing the impedance of a treated area