Blocker door equipped with large cavity acoustic structure

A blocker door, comprising:

• a door body having a backplate;
• a facesheet coupled with the door body and defining a plurality of perforations;
• and
• a plurality of ribs arranged between the backplate and the facesheet to define a plurality of cavities that communicate with the plurality of perforations to create a plurality of acoustic cells;
• wherein the door body has a hinge extending from the backplate in a direction opposite the plurality of ribs, and wherein the backplate defines a hinge recess in which the hinge is positioned, and
• wherein the door body includes a flange extending from the backplate, a mounting base, an outer wall, and wherein the plurality of ribs includes a partition rib and a hinge rib that extends between and connects the flange and the mounting base.

An aft fan duct assembly, comprising:

• an inner duct wall;
• an outer duct wall, the inner duct wall and the outer duct wall defining a fan duct;
• blocker doors arranged within the fan duct and each movable between a stowed position and a deployed position, and wherein each one of the blocker doors comprises:
• a door body having a backplate;
• a plurality of ribs that extend from the backplate to define a plurality of cavities, wherein the plurality of ribs includes a set of ribs that intersect at a rib juncture, wherein a first rib of the set of ribs extends in a first direction, a second rib of the set of ribs extends perpendicular to the first direction, and a third rib of the set of ribs extends diagonally between the first rib and second rib;
• and
• a facesheet coupled with the door body, wherein the facesheet encloses the plurality of cavities and defines a plurality of perforations that communicate with the plurality of cavities to create a plurality of acoustic cells.

A method of fabricating a blocker door, comprising:

• creating a door body from a block of material, the door body having a backplate and a plurality of ribs that extend from the backplate to define a plurality of cavities, wherein the plurality of ribs comprises:
• a first rib extending in a first direction;
• a first-side aft rib angled with respect to the first rib;
• a first-side central rib extending perpendicular to the first rib;
• a first-side central diagonal rib arranged diagonal to the first rib;
• and
• wherein the first rib, the first-side aft rib, the first-side central rib, and the first-side central diagonal rib intersect at a central rib juncture;
• and
• coupling a facesheet to the door body to enclose the plurality of cavities and so that a plurality of perforations defined by the facesheet communicate with the plurality of cavities to create a plurality of acoustic cells.