Patent ID: 7866440

Claim:
An acoustic barrel for an engine nacelle inlet, the acoustic barrel comprising: (a) a first longitudinal edge defined by a first cellular core portion disposed between a first perforated inner skin portion and a first outer skin portion; (b) a second longitudinal edge defined by a second cellular core portion disposed between a second perforated inner skin portion and a second outer skin portion; (c) a plurality of first edge cells along the first longitudinal edge, and a plurality of second edge cells along the second longitudinal edge, at least some of the first and second edge cells being characterized by a cell wall opening proximate to its respective longitudinal edge; (d) at least one strip substantially covering the cell wall openings in the first and second edge cells, the strip being imperforate, distinct from the first inner and outer skin portions and adhesively joined to at least a portion of one or both the first edge cells and the second edge cells, such that said one or both the first edge cells and the second edge cells are available for purposes of sound attenuation; and (e) at least one plate extending between and along the first and second longitudinal edges, the plate being attached to the first and second outer skin portions.