CORRUGATED ACOUSTIC STIFFENING DEVICES AND METHODS

A method for forming a fiber-reinforced thermoplastic acoustic panel (300) may comprise: stacking plies of thermoplastic composite sheets to a first thickness to form a top sheet (320); stacking plies of thermoplastic composite sheets to a second thickness to form a backskin (330); staking plies of thermoplastic composite sheets to a third thickness to form a stiffening member (312); forming the top sheet (320) in a first contour; forming the backskin (330) in a second contour, the second contour being different from the first contour; forming the stiffening member (312) comprising a shape having a plurality of peaks (314) and troughs (316); bonding the stiffening member (312) to the top sheet (320) and the backskin (330); and perforating the top sheet (320).