Abstract: An acoustic panel is provided that includes a perforated first skin, a second skin and a core. The core is between and connected to the perforated first skin and the second skin. The core includes a plurality of chambers, a first corrugated structure and a second corrugated structure. The chambers includes a first chamber. The first chamber extends from the perforated first skin, through the first corrugated structure and the second corrugated structure, to the second skin.

Abstract: An acoustic panel is provided that includes a perforated first skin, a second skin and a core. The core is connected to the perforated first skin and the second skin. The core includes a plurality of chambers and a plurality of septums respectively arranged with the chambers. The chambers include a first chamber that extends vertically between the perforated first skin and the second skin. The septums include a first septum that extends laterally across the first chamber. The first septum includes a first septum orifice. The first septum tapers laterally inward towards the first septum orifice as the first septum extends vertically towards the second skin.

Abstract: An acoustic panel is provided that includes a perforated first skin, a second skin and a core. The core is between and connected to the perforated first skin and the second skin. The core includes a plurality of chambers, a first corrugated structure and a second corrugated structure. The chambers includes a first chamber. The first chamber extends from the perforated first skin, through the first corrugated structure and the second corrugated structure, to the second skin.

Abstract: An acoustic panel is provided that includes a perforated first skin, a second skin and a core. The core is connected to the perforated first skin and the second skin. The core includes a plurality of chambers and a plurality of septums respectively arranged with the chambers. The chambers include a first chamber that extends vertically between the perforated first skin and the second skin. The septums include a first septum that extends laterally across the first chamber. The first septum includes a first septum orifice. The first septum tapers laterally inward towards the first septum orifice as the first septum extends vertically towards the second skin.

Abstract: A method may comprise applying a first adhesive to a cavity of a bond panel, the cavity defined by a raised body portion of the bond panel, inserting an acoustic insert assembly in the cavity, the acoustic insert assembly being secured in the cavity by the first adhesive, and securing edges of the acoustic insert assembly to the raised body portion of the bond panel with a second adhesive to create a seamless interface between the edges and the raised body portion.

Abstract: An acoustic panel is disclosed. In various embodiments, the acoustic panel includes a first layer; a cell having a first cell end connected to the first layer and a second cell end spaced a cell length from the first cell end, the cell having a first wall extending between the first cell end and the second cell end; and a septum having a central portion positioned within the cell and a first tab extending from the central portion, the first tab defining a first surface positioned against the first wall and a first distal end positioned adjacent the first layer.

Abstract: A process for manufacturing a composite structure includes: providing first mandrels, each first mandrel including a base and a plurality of projections arranged longitudinally along and projecting vertically out from the base; providing second mandrels; providing first ribbon plies, each first ribbon ply including a sheet of fibrous material; arranging each first ribbon ply with a respective first mandrel, the arranging of each first ribbon ply including substantially covering each surface of each of the projections of one of the first mandrels with a respective first ribbon ply; mating each second mandrel with a respective first mandrel such that each first ribbon ply is sandwiched between a respective first mandrel and a respective second mandrel; and curing resin disposed with the first ribbon plies to consolidate the first ribbon plies together and form a fiber-reinforced composite core structure of an acoustic panel.

Abstract: A panel is provided for attenuating noise. This panel includes a perforated first skin, a second skin, an array of corrugations, a first channel, a second channel, a plurality of first sidewalls and a plurality of second sidewalls. The array of corrugations includes a first corrugation and a second corrugation. Each of the corrugations includes a baffle and a septum. The first channel is formed by the baffle of the first corrugation, the septum of the first corrugation and the first skin. The second channel is formed by the baffle of the second corrugation, the septum of the first corrugation and the second skin. The first sidewalls divide the first channel into a plurality of first chambers. The second sidewalls divide the second channel into a plurality of second chambers. A first of the second chambers is fluidly coupled with a subset of the first chambers through perforations in the septum of the first corrugation.

Abstract: A method may comprise applying a first adhesive to a cavity of a bond panel, the cavity defined by a raised body portion of the bond panel, inserting an acoustic insert assembly in the cavity, the acoustic insert assembly being secured in the cavity by the first adhesive, and securing edges of the acoustic insert assembly to the raised body portion of the bond panel with a second adhesive to create a seamless interface between the edges and the raised body portion.

Abstract: A panel is provided for attenuating noise. This panel includes a perforated first skin, a second skin, an array of corrugations, a first channel, a second channel, a plurality of first sidewalls and a plurality of second sidewalls. The array of corrugations includes a first corrugation and a second corrugation. Each of the corrugations includes a baffle and a septum. The first channel is formed by the baffle of the first corrugation, the septum of the first corrugation and the first skin. The second channel is formed by the baffle of the second corrugation, the septum of the first corrugation and the second skin. The first sidewalls divide the first channel into a plurality of first chambers. The second sidewalls divide the second channel into a plurality of second chambers. A first of the second chambers is fluidly coupled with a subset of the first chambers through perforations in the septum of the first corrugation.

Abstract: A process for manufacturing a composite structure includes: providing first mandrels, each first mandrel including a base and a plurality of projections arranged longitudinally along and projecting vertically out from the base; providing second mandrels; providing first ribbon plies, each first ribbon ply including a sheet of fibrous material; arranging each first ribbon ply with a respective first mandrel, the arranging of each first ribbon ply including substantially covering each surface of each of the projections of one of the first mandrels with a respective first ribbon ply; mating each second mandrel with a respective first mandrel such that each first ribbon ply is sandwiched between a respective first mandrel and a respective second mandrel; and curing resin disposed with the first ribbon plies to consolidate the first ribbon plies together and form a fiber-reinforced composite core structure of an acoustic panel.

Abstract: A method may comprise applying a first adhesive to a cavity of a bond panel, the cavity defined by a raised body portion of the bond panel, inserting an acoustic insert assembly in the cavity, the acoustic insert assembly being secured in the cavity by the first adhesive, and securing edges of the acoustic insert assembly to the raised body portion of the bond panel with a second adhesive to create a seamless interface between the edges and the raised body portion.

Abstract: An apparatus is provided for promoting laminar flow. The apparatus includes a panel extending between an interior surface and an exterior air flow surface. The panel includes a plurality of macro apertures and a plurality of micro apertures. A first one of the macro apertures extends into the panel from the interior surface. A first one of the micro apertures extends into the panel from the exterior air flow surface and is fluidly coupled with the first one of the macro apertures.

Abstract: Method of manufacturing bond panels and bond panel assemblies are provided. In various embodiments, the method may comprise laying up a top skin on a tool comprising a mandrel. The method may further comprise laying out core on the top skin. The method may further comprise laying up back skin to create an assembly. The assembly may comprise the top skin, the core, and the back skin. The method may further comprise placing the assembly in a bag to provide a bagged assembly. The method may also comprise placing the bagged assembly in an autoclave. The method may further comprise subjecting the bagged assembly to a pressure and a temperature for a determined amount of time. In this regard, the back skin, the core, and the top skin may be co-cured in a single autoclave pressurization and heating operation.

Abstract: Method of manufacturing bond panels and bond panel assemblies are provided. In various embodiments, the method may comprise laying up a top skin on a tool comprising a mandrel. The method may further comprise laying out core on the top skin. The method may further comprise laying up back skin to create an assembly. The assembly may comprise the top skin, the core, and the back skin. The method may further comprise placing the assembly in a bag to provide a bagged assembly. The method may also comprise placing the bagged assembly in an autoclave. The method may further comprise subjecting the bagged assembly to a pressure and a temperature for a determined amount of time. In this regard, the back skin, the core, and the top skin may be co-cured in a single autoclave pressurization and heating operation.

Abstract: An apparatus is provided for promoting laminar flow. The apparatus includes a panel extending between an interior surface and an exterior air flow surface. The panel includes a plurality of macro apertures and a plurality of micro apertures. A first one of the macro apertures extends into the panel from the interior surface. A first one of the micro apertures extends into the panel from the exterior air flow surface and is fluidly coupled with the first one of the macro apertures.