Patent ID: 11881199
Assignee: ITT MANUFACTURING ENTERPRISES, LLC
Field: Transport (Mechanical engineering)
Classification: CPC G  B | IPC B  G

Claim 18:
19. A method of manufacturing a sound dampening inlet duct for an aircraft, the method comprising:
inserting a material dispensing head into an inlet duct;
adding material, with the material dispensing head, onto an interior wall of the inlet duct; and
forming, with the added material, an integrated multi-frequency array of interconnected resonator chambers on the interior wall of the inlet duct;
wherein the integrated multi-frequency array of interconnected resonator chambers comprises a plurality of first chambers having a first volume and a plurality of second chambers having a second volume;
each first chamber comprising a first longitudinal portion and a second longitudinal portion, the first longitudinal portion and the second longitudinal portion defining a first interior space, the first and second longitudinal portions coupled by a first bend region; and
each second chamber comprising a third longitudinal portion and a fourth longitudinal portion, the third longitudinal portion and the fourth longitudinal portion defining a second interior space, the third and fourth longitudinal portions coupled by a second bend region; and
wherein the first longitudinal portion is parallel to and shorter than the third longitudinal portion, the second longitudinal portion is parallel to shorter than the fourth longitudinal portion, and each first resonator chamber is nested within a second resonator chamber.