Acoustics – Sound-modifying means – Sound absorbing panels
Patent
1998-02-19
1999-11-02
Dang, Khanh
Acoustics
Sound-modifying means
Sound absorbing panels
181292, 181213, E04B 182
Patent
active
059752378
ABSTRACT:
An improved acoustic panel (26) for the nacelle (20) of a high bypass jet engine. The acoustic panel (26) has a perforated composite inner sheet (54), an outer composite sheet (96, 98), and a new reinforcement structure, or pre-cured doubler (62) therein. The pre-cured doubler (62) is arranged to receive a load applied to the acoustic panel (26), and includes a face sheet (64) connected to a structural attachment area (52) of the perforated composite inner sheet (54). A structurally-reinforced core (63) is connected the face sheet (64). Preferably, the width of the face sheet (64) in an air flow direction of the acoustic panel (26) is substantially equal to the width of the structurally reinforced core (63) in the air flow direction. The pre-cured doubler (62) provides increase acoustic area in parts of the acoustic panel adjacent to attachment fittings (46). Expanded epoxy (87a) is also used to reinforce side edges and selected areas of the acoustic core (60) for the acoustic panel (26).
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Kitt Brian R.
Popp Thomas D.
Stratton Terry W.
Welch John M.
Wikstrom Robert F.
Dang Khanh
The Boeing Company
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