Structural single degree of freedom face sheet acoustic liner
AssigneeThe Boeing Company
InventorsMarc J. Froning, Arnold J. Lauder, Stefan Ozog, Brian L. Riedel
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Abstract
A co-curable thermoset acoustic liner and method of forming the same includes a sound attenuating core having a plurality of core cells. An inner face sheet having a plurality of face sheet apertures is coupled to the core by an inner thermoset adhesive sheet, which has a plurality of adhesive sheet apertures. Each of the plurality of adhesive sheet apertures is aligned within a corresponding one of the plurality of face sheet apertures so that the plurality of core cells are placed in fluid communication with airflow over the inner face sheet to create a Single Degree of Freedom (SDOF) acoustic liner.
Claims20
A co-curable thermoset acoustic liner comprising:
- a sound attenuating core having a plurality of core cells extending from an inner core edge to an outer core edge;
- an outer face sheet secured to the outer core edge of the sound attenuating core;
- an inner face sheet having a plurality of face sheet apertures extending through the inner face sheet;
- and
- an inner adhesive sheet having a plurality of adhesive sheet apertures disposed between the inner face sheet and the sound attenuating core and securing the inner face sheet to the inner core edge, wherein each of the plurality of adhesive sheet apertures is aligned within a corresponding one of the plurality of face sheet apertures so that the plurality of core cells are placed in fluid communication with airflow over the inner face sheet by the plurality of face sheet apertures and the plurality of adhesive sheet apertures creating a Single Degree of Freedom (SDOF) acoustic liner wherein the inner face sheet, the outer face sheet, the inner adhesive sheet and the sound attenuating core are co-bonded into the co-curable thermoset acoustic liner.
A method for fabricating a co-curable thermoset acoustic liner comprising:
- forming an inner face sheet;
- micro-perforating a plurality of face sheet apertures through the inner face sheet via laser;
- attaching an inner adhesive sheet to the inner face sheet;
- micro-perforating a plurality of adhesive sheet apertures through the inner adhesive sheet via laser, wherein each of the plurality of adhesive sheet apertures is aligned within a corresponding one of the plurality of face sheet apertures;
- co-curing an inner core edge of a sound attenuating core to the inner adhesive sheet opposite the inner face sheet, wherein the sound attenuating core has a plurality of core cells extending from the inner core edge to an outer core edge, and wherein the plurality of core cells are placed in fluid communication with airflow over the inner face sheet by the plurality of face sheet apertures and the plurality of adhesive sheet apertures;
- and
- co-curing an outer face sheet to the outer core edge of the sound attenuating core thereby creating a Single Degree of Freedom (SDOF) acoustic liner.
A method for fabricating a co-curable thermoset acoustic liner comprising:
- forming an inner face sheet;
- creating a plurality of face sheet apertures through the inner face sheet;
- attaching an inner core edge of a sound attenuating core to the inner face sheet with an inner adhesive sheet disposed between the inner face sheet and the sound attenuating core, and attaching an outer face sheet to an outer core edge of the sound attenuating core, wherein the sound attenuating core has a plurality of core cells extending from the inner core edge to the outer core edge;
- and
- creating a plurality of adhesive sheet apertures through the inner adhesive sheet, wherein each of the plurality of adhesive sheet apertures is aligned within a corresponding one of the plurality of face sheet apertures, and wherein the plurality of core cells are placed in fluid communication with airflow over the inner face sheet by the plurality of face sheet apertures and the plurality of adhesive sheet apertures.
Dependencies are inferred from the claim text.