Alenia Aermacchi S.p.a.

DIego Copiello

Emanuele Merlo

Gianni Duccini

Pier Giorgio Ferrante

An element () for sound absorption is intended for being mounted on components of aircrafts, such as engine nacelles. The element includes a face-sheet (), which is, at least in a region thereof, acoustically permeable, a substantially sound-reflective back-sheet () and a honeycomb layer (), 'sandwiched' between the face-sheet () and the back-sheet () and defining a mesh structure which has hollow cells (') laterally neighboring one another. The cells (&#x2032;) are adapted to make the sound waves that enter through the face-sheet () and are reflected by the back-sheet () resonate inside their side walls. The element () has a passage () that connects together a group of the cells (&#x2032;), thereby causing the cells to acoustically cooperate with one another.

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Venegono Superiore, Italy

DIego Copiello