Aspects of the disclosure are directed to a structure comprising: a plurality of cells, a first non-permeable insert in a first cell of the plurality of cells, the first insert configured to constrict, by at least a first threshold amount, a flow of fluid in the first cell such that: acoustic power
Aspects of the disclosure are directed to a structure comprising: a plurality of cells, a first non-permeable insert in a first cell of the plurality of cells, the first insert configured to constrict, by at least a first threshold amount, a flow of fluid in the first cell such that: acoustic power over a frequency range is attenuated by the structure by at least a second threshold amount, and a resonant frequency associated with the structure is shifted by at least a third threshold amount.
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1. A structure comprising: a plurality of cells;a non-permeable first insert in a first cell of the plurality of cells, the first insert configured to constrict, by at least a first threshold amount, a flow of fluid in the first cell such that: acoustic power over a frequency range is attenuated by
1. A structure comprising: a plurality of cells;a non-permeable first insert in a first cell of the plurality of cells, the first insert configured to constrict, by at least a first threshold amount, a flow of fluid in the first cell such that: acoustic power over a frequency range is attenuated by the structure by at least a second threshold amount, anda resonant frequency associated with the structure is shifted by at least a third threshold amount;wherein a surface of the first insert forms a hole that extends along an axis through the first insert, and a sectional geometry of the surface as viewed in a plane parallel to the axis is substantially round. 2. The structure of claim 1, wherein the first threshold amount is 90%. 3. The structure of claim 1, wherein the frequency range corresponds to 0-10 KHz. 4. The structure of claim 1, further comprising a non-permeable second insert, wherein the first insert is located at a first distance as measured from a bottom of the first cell, and wherein the second insert is located at a second distance as measured from the bottom of the first cell. 5. The structure of claim 4, wherein the first distance and the second distance are different. 6. The structure of claim 1, further comprising a non-permeable second insert, wherein the second insert is located in the first cell. 7. The structure of claim 1, further comprising a non-permeable second insert, wherein the second insert is located in a second cell of the plurality of cells. 8. The structure of claim 1, wherein each of the plurality of cells has a substantially hexagonal shape, and wherein the cells are arranged relative to one another to form a honeycomb profile. 9. The structure of claim 8, wherein outer edges of the first insert adhere to the shape of the first cell. 10. The structure of claim 1, wherein the frequency range and the second threshold amount are based on at least one of: a count of inserts within at least one of the cells,a location of the first insert within the first cell,a size of the first insert,a size of a hole defined by the first insert,a shape of the first insert, ora shape of the first cell. 11. The structure of claim 1, wherein the structure is configured to be incorporated in a nacelle of an aircraft. 12. The structure of claim 11, wherein the structure is configured to be incorporated in at least one of a translating sleeve or a blocker door. 13. The structure of claim 11, wherein at least one of the frequency range or the second threshold amount is based on a size of a fan housed within the nacelle. 14. The structure of claim 1, wherein the frequency range corresponds to 0-1 KHz. 15. The structure of claim 1, wherein the sectional geometry of the surface as viewed in the plane parallel to the axis is semi-circular. 16. A structure comprising: a plurality of cells;a non-permeable first insert in a first cell of the plurality of cells, the first insert configured to constrict, by at least a first threshold amount, a flow of fluid in the first cell such that: acoustic power over a frequency range is attenuated by the structure b at least a second threshold amount, anda resonant frequency associated with the structure is shifted by at least a third threshold amount;a non-permeable second insert in a second cell of the plurality of cells; anda non-permeable third insert in the second cell of the plurality of cells;wherein the first insert is substantially located at a center of the first cell, the second insert is substantially located at a top of the second cell, and the third insert is substantially located at a bottom of the second cell. 17. The structure of claim 16, wherein the first insert is a first distance from a bottom of the first cell, the second insert is a second distance from the bottom of the second cell, the third insert is a third distance from the bottom of the second cell, and the first distance is less than the second distance and greater than the third distance. 18. A structure, comprising: a plurality of cells comprising a first cell; anda non-permeable first insert arranged in the first cell, the first insert configured to constrict, by at least a first threshold amount, a flow of fluid in the first cell such that: acoustic power over a frequency range is attenuated by the structure by at least a second threshold amount, anda resonant frequency associated with the structure is shifted by at least a third threshold amount;wherein an aperture extends along a centerline through the first insert, the aperture is partially formed by an annular edge portion of the first insert, and the annular edge portion comprises a curved bevel. 19. The structure of claim 18, wherein the aperture is further partially formed by a second annular edge portion of the first insert, and the second annular edge portion comprises a curved bevel.
Harp Marlyn F. (Winfield KS) Diepenbrock ; Jr. James L. (Wichita KS) Nelsen M. Dean (Wichita KS), Honeycomb core with internal septum and method of making same.
Newton Jefferson F. (Seattle WA) Martin Thomas D. (Bellevue WA) Westre Willard N. (Bellevue WA) Carbery David J. (Vashon Island WA) Ikegami Roy (Seattle WA), Lightweight honeycomb panel structure.
Belleguic,Yann; Perrot,Clemence Julia Genevieve Marie; Portal,Jean Fabrice Marcel, Method of assembling and monitoring an acoustic panel comprising a double resonator with a honeycomb core.
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