Patent ID: 8727072
Filing Date: 2014-05-20
Classification: E04B,F02C,F05D,G10K,Y02T,Y10T

Abstract:
1. A method for making an acoustic structure, said method comprising the steps of: providing a honeycomb comprising a first edge and a second edge, said honeycomb further comprising a plurality of walls that extend between said first and second edges, said walls defining a plurality of cells wherein each of said cells has a cross-sectional area measured perpendicular to said walls and a depth defined by the distance between said first and second edges; providing at least one sheet of flexible material that has a thickness and a perimeter, said flexible material being sufficiently flexible to be folded into the shape of a septum cap for insertion into said cell, said septum cap having a resonator portion that extends transversely across said cells and which has an outer edge to be located at said walls and a flange portion that is located between said outer edge of said resonator portion and the perimeter of said sheet of acoustic material, said flange portion extending parallel to said walls and comprising an anchoring surface having a width; forming said sheet of flexible material into said septum cap; locating said septum cap into said cell such that said septum cap is held in place only by friction locking of said septum cap to said walls, said anchoring surface being sufficiently wide and the bounce-back of said flexible material being sufficient to provide friction-locking of the septum cap to said cell walls; and adhesively bonding said anchoring surface to the wall of said honeycomb to form said acoustic structure.