Abstract: A panel for attenuating noise includes a porous first skin, a second skin, and a core connected between the porous first skin and the second skin. The core includes a corrugated body and a stringer body. The corrugated body includes a plurality of corrugations configured from at least a plurality of baffles and a plurality of porous septums. Each of the corrugations includes a respective one of the baffles and a respective one of the porous septums. A first of the corrugations forms a first channel that extends laterally between and longitudinally along a first of the baffles and a first of the porous septums. The stringer body includes a plurality of sidewalls arranged longitudinally along the first channel. Each of the sidewalls is disposed within the first channel and configured to fluidly isolate longitudinally adjacent portions of the first channel from one another.

Abstract: A panel is provided for attenuating noise. This panel includes a porous first skin, a second skin and a core, which is connected between the porous first skin and the second skin. The core includes a corrugated body and a plurality of stringer bodies. The corrugated body includes a plurality of corrugations configured from at least a plurality of baffles and a plurality of porous septums. Each of the corrugations includes a respective one of the baffles and a respective one of the porous septums. A first of the corrugations forms a first channel that extends laterally between a first of the baffles and a first of the porous septums. The stringer bodies are spaced longitudinally along the first channel. Each of the stringer bodies includes a first sidewall disposed within the first channel and configured to fluidly isolate longitudinally adjacent portions of the first channel from one another.

Abstract: A nacelle may comprise a noise suppressing structure. The noise suppressing structure may comprise a plurality of noise suppressing cells situated between a perforated layer of material and a non-perforated layer of material. The plurality of noise suppressing cells may contact the perforated layer of material and the non-perforated layer of material at an acute angle (e.g., between twenty and seventy-five degrees) such that the plurality of noise suppressing cells are non-orthogonal to the perforated layer of material and the non-perforated layer of material. Further, each of the plurality of noise suppressing cells may comprise a hexagonal cross-sectional profile. Further still, the noise suppressing structure may comprise a support structure comprising a plurality of support members, wherein the plurality of noise suppressing cells are situated within the support structure.

Abstract: A panel is provided for attenuating noise. This panel includes a porous first skin, a second skin and a core, which is connected between the porous first skin and the second skin. The core includes a corrugated body and a plurality of stringer bodies. The corrugated body includes a plurality of corrugations configured from at least a plurality of baffles and a plurality of porous septums. Each of the corrugations includes a respective one of the baffles and a respective one of the porous septums. A first of the corrugations forms a first channel that extends laterally between a first of the baffles and a first of the porous septums. The stringer bodies are spaced longitudinally along the first channel. Each of the stringer bodies includes a first sidewall disposed within the first channel and configured to fluidly isolate longitudinally adjacent portions of the first channel from one another.

Abstract: A panel for attenuating noise includes a porous first skin, a second skin, and a core connected between the porous first skin and the second skin. The core includes a corrugated body and a stringer body. The corrugated body includes a plurality of corrugations configured from at least a plurality of baffles and a plurality of porous septums. Each of the corrugations includes a respective one of the baffles and a respective one of the porous septums. A first of the corrugations forms a first channel that extends laterally between and longitudinally along a first of the baffles and a first of the porous septums. The stringer body includes a plurality of sidewalls arranged longitudinally along the first channel. Each of the sidewalls is disposed within the first channel and configured to fluidly isolate longitudinally adjacent portions of the first channel from one another.

Abstract: A fiber preform is provided. The fiber preform may comprise a base including a fiber weave with a plurality of fibers oriented in three directions. A plurality of legs may extend a first height from the base and include a fiber weave with the plurality of fibers oriented in three directions. A fiber reinforcement may be disposed proximate the legs with a second height equal to the first height. The fiber reinforcement may comprise a first ply and a second ply oriented orthogonal to the first ply in a plane parallel to the legs.

Abstract: A nacelle may include a noise suppressing structure. The noise suppressing structure may utilize a noise suppressing cells situated between a perforated layer of material and a non-perforated layer of material. The noise suppressing cells may have a first portion and a second portion separated by a septum. The first portion may contact the septum at an obtuse angle and the second portion may contact the septum at a reflex angle.

Abstract: A fiber preform is provided. The fiber preform may comprise a base including a fiber weave with a plurality of fibers oriented in three directions. A plurality of legs may extend a first height from the base and include a fiber weave with the plurality of fibers oriented in three directions. A fiber reinforcement may be disposed proximate the legs with a second height equal to the first height. The fiber reinforcement may comprise a first ply and a second ply oriented orthogonal to the first ply in a plane parallel to the legs.

Abstract: A nacelle may include a noise suppressing structure. The noise suppressing structure may utilize a noise suppressing cells situated between a perforated layer of material and a non-perforated layer of material. The noise suppressing cells may have a first portion and a second portion separated by a septum. The first portion may contact the septum at an obtuse angle and the second portion may contact the septum at a reflex angle.

Abstract: A nacelle may comprise a noise suppressing structure. The noise suppressing structure may comprise a plurality of noise suppressing cells situated between a perforated layer of material and a non-perforated layer of material. The plurality of noise suppressing cells may contact the perforated layer of material and the non-perforated layer of material at an acute angle (e.g., between twenty and seventy-five degrees) such that the plurality of noise suppressing cells are non-orthogonal to the perforated layer of material and the non-perforated layer of material. Further, each of the plurality of noise suppressing cells may comprise a hexagonal cross-sectional profile. Further still, the noise suppressing structure may comprise a support structure comprising a plurality of support members, wherein the plurality of noise suppressing cells are situated within the support structure.