초록 ▼

A sandwich composite panel (2) provides a load bearing structural member as well as noise protection, especially for a helicopter fuselage cell or cabin. The panel (2) includes an inner honey-comb core (6) made up of hollow cell bodies (4) extending trans-versely and sandwiched between first and sec

A sandwich composite panel (2) provides a load bearing structural member as well as noise protection, especially for a helicopter fuselage cell or cabin. The panel (2) includes an inner honey-comb core (6) made up of hollow cell bodies (4) extending trans-versely and sandwiched between first and second cover skins (8, 10) of fiber composite material. In order to achieve a low weight, a simple manufacturing, and good noise absorption, at least one of the cover skins (8) adapted to face the main source of noise (H) is made up of an open mesh fiber composite net (12) and a flexible cover film (16) applied on the outer surface of this fiber composite net (12). The net (12) has a smaller mesh size than the inner cross-sectional size of the hollow cell bodies (4).

대표청구항 ▼

[ What is claimed is:] [1.] A sandwich composite panel comprising:a first cover skin comprising a first open-mesh fiber composite net having a first mesh size, and a first flexible cover film laminated onto said first open-mesh fiber composite net;a second cover skin comprising a second open-mesh fi

[ What is claimed is:] [1.] A sandwich composite panel comprising:a first cover skin comprising a first open-mesh fiber composite net having a first mesh size, and a first flexible cover film laminated onto said first open-mesh fiber composite net;a second cover skin comprising a second open-mesh fiber composite net having a second mesh size that is different from said first mesh size, and a second flexible cover film laminated onto said second open-mesh fiber composite net; andan inner core sandwiched between said first and second cover skins, wherein said inner core comprises a plurality of hollow cell bodies that respectively extend transversely between said first and second cover skins and respectively have internal cross-sectional dimensions greater than said first mesh size and greater than said second mesh size.