2007/05/18 by Jean‐Philippe Groby, Armand Wirgin, Groby, Jean-Philippe +5
Engineering · #Acoustic Wave Phenomena Research #Composite Material Mechanics #Ultrasonics and Acoustic Wave Propagation
paper · pdf · doi:10.48550/arxiv.0705.2754
The acoustic response of a rigid frame porous slab with a periodic set of inclusions is calculated by use of a multipole method. The acoustic properties, in particular the absorption, of such a structure are then derived and studied. Numerical results together with a modal analysis show that the addition of a periodic set of high-contrast inclusions leads to quasi-modes excitation of both the slab and the gratings, and to a large increase of the acoustic absorption of the initial slab, this being partly due to the quasi-modes excitation.